//
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// ZJContentView.m
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// ZJScrollPageView
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//
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// Created by jasnig on 16/5/6.
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// Copyright © 2016年 ZeroJ. All rights reserved.
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//
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#import "ZJContentView.h"
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#import "ZJScrollSegmentView.h"
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#import "UIViewController+ZJScrollPageController.h"
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typedef NS_ENUM(NSInteger, ZJScrollPageControllerScrollDirection) {
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ZJScrollPageControllerScrollDirectionNone,
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ZJScrollPageControllerScrollDirectionLeft,
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ZJScrollPageControllerScrollDirectionRight
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};
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@interface ZJContentView ()<UIScrollViewDelegate, UIGestureRecognizerDelegate> {
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CGFloat _oldOffSetX;
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BOOL _isLoadFirstView;
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// BOOL _isAnimating;
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}
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/** 避免循环引用*/
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@property (weak, nonatomic) ZJScrollSegmentView *segmentView;
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// 父类 用于处理添加子控制器 使用weak避免循环引用
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@property (weak, nonatomic) UIViewController *parentViewController;
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// 当这个属性设置为YES的时候 就不用处理 scrollView滚动的计算
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@property (assign, nonatomic) BOOL forbidTouchToAdjustPosition;
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@property (assign, nonatomic) NSInteger itemsCount;
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// 所有的子控制器
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@property (strong, nonatomic) NSMutableDictionary<NSString *, UIViewController<ZJScrollPageViewChildVcDelegate> *> *childVcsDic;
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// 当前控制器
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@property (strong, nonatomic) UIViewController<ZJScrollPageViewChildVcDelegate> *currentChildVc;
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/// 如果类似cell缓存一样, 虽然创建的控制器少了, 但是每个页面每次都要重新加载数据, 否则显示的内容就会出错, 貌似还不如每个页面创建一个控制器好
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//@property (strong, nonatomic) NSCache *cacheChildVcs;
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@property (strong, nonatomic) UIScrollView *scrollView;
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@property (strong, nonatomic) UIView *currentView;
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@property (strong, nonatomic) UIView *oldView;
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@property (assign, nonatomic) NSInteger currentIndex;
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@property (assign, nonatomic) NSInteger oldIndex;
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@property (assign, nonatomic) ZJScrollPageControllerScrollDirection scrollDirection;
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@end
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@implementation ZJContentView
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#define cellID @"cellID"
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static NSString *const kContentOffsetOffKey = @"contentOffset";
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#pragma mark - life cycle
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- (instancetype)initWithFrame:(CGRect)frame segmentView:(ZJScrollSegmentView *)segmentView parentViewController:(UIViewController *)parentViewController delegate:(id<ZJScrollPageViewDelegate>) delegate {
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if (self = [super initWithFrame:frame]) {
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self.segmentView = segmentView;
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self.delegate = delegate;
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self.parentViewController = parentViewController;
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[self commonInit];
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[self addNotification];
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}
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return self;
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}
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- (void)commonInit {
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_oldIndex = -1;
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_currentIndex = -1;
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_oldOffSetX = 0.0f;
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_forbidTouchToAdjustPosition = NO;
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_isLoadFirstView = YES;
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if ([_delegate respondsToSelector:@selector(numberOfChildViewControllers)]) {
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self.itemsCount = [_delegate numberOfChildViewControllers];
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}
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[self addSubview:self.scrollView];
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[self setCurrentIndex:0 andScrollDirection:ZJScrollPageControllerScrollDirectionNone];
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if (self.parentViewController.parentViewController && [self.parentViewController.parentViewController isKindOfClass:[UINavigationController class]]) {
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UINavigationController *navi = (UINavigationController *)self.parentViewController.parentViewController;
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if (navi.interactivePopGestureRecognizer) {
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navi.interactivePopGestureRecognizer.delegate = self;
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[self.scrollView.panGestureRecognizer requireGestureRecognizerToFail:navi.interactivePopGestureRecognizer];
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}
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}
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}
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- (void)addNotification {
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[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(receiveMemoryWarningHander:) name:UIApplicationDidReceiveMemoryWarningNotification object:nil];
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}
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- (void)receiveMemoryWarningHander:(NSNotificationCenter *)noti {
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__weak typeof(self) weakSelf = self;
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[_childVcsDic enumerateKeysAndObjectsUsingBlock:^(NSString * _Nonnull key, UIViewController<ZJScrollPageViewChildVcDelegate> * _Nonnull childVc, BOOL * _Nonnull stop) {
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__strong typeof(self) strongSelf = weakSelf;
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if (childVc != strongSelf.currentChildVc) {
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[_childVcsDic removeObjectForKey:key];
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[ZJContentView removeChildVc:childVc];
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}
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}];
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}
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- (void)dealloc {
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self.parentViewController = nil;
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[[NSNotificationCenter defaultCenter] removeObserver:self];
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#if DEBUG
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NSLog(@"ZJContentView---销毁");
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#endif
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}
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#pragma mark - public helper
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/** 给外界可以设置ContentOffSet的方法 */
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- (void)setContentOffSet:(CGPoint)offset animated:(BOOL)animated {
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self.forbidTouchToAdjustPosition = YES;
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NSInteger currentIndex = offset.x/self.scrollView.bounds.size.width;
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_oldIndex = _currentIndex;
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[self setCurrentIndex:currentIndex andScrollDirection:ZJScrollPageControllerScrollDirectionNone];
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if (animated) {
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CGFloat delta = offset.x - self.scrollView.contentOffset.x;
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NSInteger page = fabs(delta)/self.scrollView.bounds.size.width;
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if (page>=2) {// 需要滚动两页以上的时候, 跳过中间页的动画
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__weak typeof(self) weakself = self;
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dispatch_async(dispatch_get_main_queue(), ^{
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__strong typeof(weakself) strongSelf = weakself;
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if (strongSelf) {
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[strongSelf.scrollView setContentOffset:offset animated:NO];
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[self didAppearWithIndex:currentIndex];
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[self didDisappearWithIndex:_oldIndex];
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}
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});
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}
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else {
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[self.scrollView setContentOffset:offset animated:animated];
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[self didAppearWithIndex:currentIndex];
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[self didDisappearWithIndex:_oldIndex];
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}
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}
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else {
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[self.scrollView setContentOffset:offset animated:animated];
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[self didAppearWithIndex:currentIndex];
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[self didDisappearWithIndex:_oldIndex];
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}
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}
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/** 给外界刷新视图的方法 */
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- (void)reload {
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[self.childVcsDic enumerateKeysAndObjectsUsingBlock:^(NSString * _Nonnull key, UIViewController<ZJScrollPageViewChildVcDelegate> * _Nonnull childVc, BOOL * _Nonnull stop) {
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[ZJContentView removeChildVc:childVc];
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childVc = nil;
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}];
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self.childVcsDic = nil;
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[self.scrollView removeFromSuperview];
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self.scrollView = nil;
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[self commonInit];
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}
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+ (void)removeChildVc:(UIViewController *)childVc {
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[childVc willMoveToParentViewController:nil];
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[childVc.view removeFromSuperview];
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[childVc removeFromParentViewController];
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}
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#pragma mark - UIScrollViewDelegate
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- (void)scrollViewDidScroll:(UIScrollView *)scrollView {
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if (self.forbidTouchToAdjustPosition) {// first or last
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return;
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}
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if (scrollView.contentOffset.x <= 0) {
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[self contentViewDidMoveFromIndex:0 toIndex:0 progress:1.0];
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return;
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}
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if (scrollView.contentOffset.x >= scrollView.contentSize.width - scrollView.bounds.size.width) {
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[self contentViewDidMoveFromIndex:_itemsCount-1 toIndex:_itemsCount-1 progress:1.0];
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return;
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}
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CGFloat tempProgress = scrollView.contentOffset.x / self.bounds.size.width;
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NSInteger tempIndex = (NSInteger)tempProgress;
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CGFloat progress = tempProgress - floor(tempProgress);
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CGFloat deltaX = scrollView.contentOffset.x - _oldOffSetX;
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if (deltaX > 0 && (deltaX != scrollView.bounds.size.width)) {// 向右
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_oldIndex = tempIndex;
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NSInteger tempCurrentIndex = tempIndex + 1;
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[self setCurrentIndex:tempCurrentIndex andScrollDirection:ZJScrollPageControllerScrollDirectionRight];
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}
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else if (deltaX < 0) {
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progress = 1.0 - progress;
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_oldIndex = tempIndex + 1;
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[self setCurrentIndex:tempIndex andScrollDirection:ZJScrollPageControllerScrollDirectionLeft];
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}
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else {
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return;
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}
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NSLog(@"%f------%ld----%ld------", progress, _oldIndex, _currentIndex);
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[self contentViewDidMoveFromIndex:_oldIndex toIndex:_currentIndex progress:progress];
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}
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/** 滚动减速完成时再更新title的位置 */
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- (void)scrollViewDidEndDecelerating:(UIScrollView *)scrollView {
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NSInteger currentIndex = (scrollView.contentOffset.x / self.bounds.size.width);
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if (_scrollDirection == ZJScrollPageControllerScrollDirectionNone && !_forbidTouchToAdjustPosition) { // 开启bounds 在第一页和最后一页快速松开手又接触滑动的时候 会不合理的被调用这个代理方法 ---- 其实这个时候并没有在松开手的情况下减速完成
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return;
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}
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[self contentViewDidMoveFromIndex:currentIndex toIndex:currentIndex progress:1.0];
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// 调整title
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[self adjustSegmentTitleOffsetToCurrentIndex:currentIndex];
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if (scrollView.contentOffset.x == _oldOffSetX) {// 滚动未完成
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[self didAppearWithIndex:currentIndex];
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[self didDisappearWithIndex:_currentIndex];
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}
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else {
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[self didAppearWithIndex:_currentIndex];
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[self didDisappearWithIndex:_oldIndex];
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}
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// 重置_currentIndex 不触发set方法
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_currentIndex = currentIndex;
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_scrollDirection = ZJScrollPageControllerScrollDirectionNone;
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}
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- (void)scrollViewWillBeginDragging:(UIScrollView *)scrollView {
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_oldOffSetX = scrollView.contentOffset.x;
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self.forbidTouchToAdjustPosition = NO;
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_scrollDirection = ZJScrollPageControllerScrollDirectionNone;
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}
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#pragma mark - private helper
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- (void)contentViewDidMoveFromIndex:(NSInteger)fromIndex toIndex:(NSInteger)toIndex progress:(CGFloat)progress {
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if(self.segmentView) {
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[self.segmentView adjustUIWithProgress:progress oldIndex:fromIndex currentIndex:toIndex];
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}
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}
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- (void)adjustSegmentTitleOffsetToCurrentIndex:(NSInteger)index {
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if(self.segmentView) {
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[self.segmentView adjustTitleOffSetToCurrentIndex:index];
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}
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}
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- (void)willAppearWithIndex:(NSInteger)index {
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UIViewController<ZJScrollPageViewChildVcDelegate> *controller = [self.childVcsDic valueForKey:[NSString stringWithFormat:@"%ld", index]];
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if (controller) {
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if ([controller respondsToSelector:@selector(zj_viewWillAppearForIndex:)]) {
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[controller zj_viewWillAppearForIndex:index];
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}
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if (_delegate && [_delegate respondsToSelector:@selector(scrollPageController:childViewControllWillAppear:forIndex:)]) {
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[_delegate scrollPageController:self.parentViewController childViewControllWillAppear:controller forIndex:index];
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}
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}
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}
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- (void)didAppearWithIndex:(NSInteger)index {
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UIViewController<ZJScrollPageViewChildVcDelegate> *controller = [self.childVcsDic valueForKey:[NSString stringWithFormat:@"%ld", index]];
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if (controller) {
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if ([controller respondsToSelector:@selector(zj_viewDidAppearForIndex:)]) {
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[controller zj_viewDidAppearForIndex:index];
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}
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if (_delegate && [_delegate respondsToSelector:@selector(scrollPageController:childViewControllDidAppear:forIndex:)]) {
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[_delegate scrollPageController:self.parentViewController childViewControllDidAppear:controller forIndex:index];
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}
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}
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}
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- (void)willDisappearWithIndex:(NSInteger)index {
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UIViewController<ZJScrollPageViewChildVcDelegate> *controller = [self.childVcsDic valueForKey:[NSString stringWithFormat:@"%ld", index]];
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if (controller) {
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if ([controller respondsToSelector:@selector(zj_viewWillDisappearForIndex:)]) {
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[controller zj_viewWillDisappearForIndex:index];
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}
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if (_delegate && [_delegate respondsToSelector:@selector(scrollPageController:childViewControllWillDisappear:forIndex:)]) {
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[_delegate scrollPageController:self.parentViewController childViewControllWillDisappear:controller forIndex:index];
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}
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}
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}
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- (void)didDisappearWithIndex:(NSInteger)index {
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UIViewController<ZJScrollPageViewChildVcDelegate> *controller = [self.childVcsDic valueForKey:[NSString stringWithFormat:@"%ld", index]];
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if (controller) {
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if ([controller respondsToSelector:@selector(zj_viewDidDisappearForIndex:)]) {
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[controller zj_viewDidDisappearForIndex:index];
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}
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if (_delegate && [_delegate respondsToSelector:@selector(scrollPageController:childViewControllDidDisappear:forIndex:)]) {
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[_delegate scrollPageController:self.parentViewController childViewControllDidDisappear:controller forIndex:index];
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}
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}
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}
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- (void)setCurrentIndex:(NSInteger)currentIndex andScrollDirection:(ZJScrollPageControllerScrollDirection)scrollDirection {
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if (currentIndex != _currentIndex) {
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// NSLog(@"current -- %ld _current ---- %ld _oldIndex --- %ld", currentIndex, _currentIndex, _oldIndex);
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[self setupSubviewsWithCurrentIndex:currentIndex oldIndex:_oldIndex];
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if (scrollDirection != ZJScrollPageControllerScrollDirectionNone) {
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// 打开右边, 但是未松手又返回了打开左边
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// 打开左边, 但是未松手又返回了打开右边
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[self didDisappearWithIndex:_currentIndex];
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}
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[self willAppearWithIndex:currentIndex];
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[self willDisappearWithIndex:_oldIndex];
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if (_isLoadFirstView) { // 加载第一个controller的时候 同时出发didAppear
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[self didAppearWithIndex:currentIndex];
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_isLoadFirstView = NO;
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}
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_scrollDirection = scrollDirection;
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_currentIndex = currentIndex;
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// NSLog(@"%@",self.scrollView.subviews);
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}
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}
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- (void)setupSubviewsWithCurrentIndex:(NSInteger)currentIndex oldIndex:(NSInteger)oldIndex {
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UIViewController<ZJScrollPageViewChildVcDelegate> *currentController = [self.childVcsDic valueForKey:[NSString stringWithFormat:@"%ld", (long)currentIndex]];
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if (_delegate && [_delegate respondsToSelector:@selector(childViewController:forIndex:)]) {
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if (currentController == nil) {
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currentController = [_delegate childViewController:nil forIndex:currentIndex];
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[self.childVcsDic setValue:currentController forKey:[NSString stringWithFormat:@"%ld", (long)currentIndex]];
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} else {
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[_delegate childViewController:currentController forIndex:currentIndex];
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}
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} else {
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NSAssert(NO, @"必须设置代理和实现代理方法");
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}
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if ([currentController isKindOfClass:[UINavigationController class]]) {
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NSAssert(NO, @"不要添加UINavigationController包装后的子控制器");
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}
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CGFloat width = self.bounds.size.width;
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CGFloat height = self.bounds.size.height;
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// 添加currentController
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if (currentController.zj_scrollViewController != self.parentViewController) {
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[self.parentViewController addChildViewController:currentController];
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}
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[self.currentView.subviews makeObjectsPerformSelector:@selector(removeFromSuperview)];
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self.currentView.frame = CGRectMake(currentIndex*width, 0, width, height);
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[self.currentView addSubview:currentController.view];
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[_currentChildVc didMoveToParentViewController:self.parentViewController];
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UIViewController *oldController = [self.childVcsDic valueForKey:[NSString stringWithFormat:@"%ld", (long)_oldIndex]];
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// 添加oldController
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if (oldController) {
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[self.oldView.subviews makeObjectsPerformSelector:@selector(removeFromSuperview)];
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self.oldView.frame = CGRectMake(oldIndex*width, 0, width, height);
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[self.oldView addSubview:oldController.view];
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[oldController didMoveToParentViewController:self.parentViewController];
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}
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[self setNeedsLayout];
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}
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#pragma mark - UIGestureRecognizerDelegate
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- (BOOL)gestureRecognizerShouldBegin:(UIGestureRecognizer *)gestureRecognizer {
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if (self.parentViewController.parentViewController && [self.parentViewController.parentViewController isKindOfClass:[UINavigationController class]]) {
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UINavigationController *navi = (UINavigationController *)self.parentViewController.parentViewController;
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if (navi.visibleViewController == self.parentViewController) {// 当显示的是ScrollPageView的时候 只在第一个tag处执行pop手势
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return self.scrollView.contentOffset.x == 0;
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} else {
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return [super gestureRecognizerShouldBegin:gestureRecognizer];
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}
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}
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return [super gestureRecognizerShouldBegin:gestureRecognizer];
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}
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#pragma mark - getter --- setter
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- (UIScrollView *)scrollView {
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if (!_scrollView) {
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UIScrollView *scrollView = [[UIScrollView alloc] initWithFrame:self.bounds];
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self.currentView = [[UIView alloc] init];
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self.oldView = [[UIView alloc] init];
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scrollView.delegate = self;
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[scrollView addSubview:self.currentView];
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[scrollView addSubview:self.oldView];
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scrollView.pagingEnabled = YES;
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scrollView.showsVerticalScrollIndicator = NO;
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scrollView.showsHorizontalScrollIndicator = NO;
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scrollView.bounces = self.segmentView.segmentStyle.isContentViewBounces;
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scrollView.scrollEnabled = self.segmentView.segmentStyle.isScrollContentView;
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scrollView.contentSize = CGSizeMake(self.itemsCount*self.bounds.size.width, self.bounds.size.height);
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_scrollView = scrollView;
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}
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return _scrollView;
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}
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- (NSMutableDictionary<NSString *,UIViewController<ZJScrollPageViewChildVcDelegate> *> *)childVcsDic {
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if (!_childVcsDic) {
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NSMutableDictionary *dic = [NSMutableDictionary dictionary];
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_childVcsDic = dic;
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}
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return _childVcsDic;
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}
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@end
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