// 代码地址: https://github.com/CoderMJLee/MJRefresh
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// 代码地址: http://code4app.com/ios/%E5%BF%AB%E9%80%9F%E9%9B%86%E6%88%90%E4%B8%8B%E6%8B%89%E4%B8%8A%E6%8B%89%E5%88%B7%E6%96%B0/52326ce26803fabc46000000
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// MJRefreshComponent.m
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// MJRefreshExample
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//
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// Created by MJ Lee on 15/3/4.
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// Copyright (c) 2015年 小码哥. All rights reserved.
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//
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#import "MJRefreshComponent.h"
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#import "MJRefreshConst.h"
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@interface MJRefreshComponent()
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@property (strong, nonatomic) UIPanGestureRecognizer *pan;
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@end
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@implementation MJRefreshComponent
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#pragma mark - 初始化
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- (instancetype)initWithFrame:(CGRect)frame
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{
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if (self = [super initWithFrame:frame]) {
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// 准备工作
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[self prepare];
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// 默认是普通状态
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self.state = MJRefreshStateIdle;
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}
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return self;
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}
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- (void)prepare
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{
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// 基本属性
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self.autoresizingMask = UIViewAutoresizingFlexibleWidth;
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self.backgroundColor = [UIColor clearColor];
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}
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- (void)layoutSubviews
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{
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[self placeSubviews];
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[super layoutSubviews];
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}
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- (void)placeSubviews{}
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- (void)willMoveToSuperview:(UIView *)newSuperview
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{
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[super willMoveToSuperview:newSuperview];
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// 如果不是UIScrollView，不做任何事情
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if (newSuperview && ![newSuperview isKindOfClass:[UIScrollView class]]) return;
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// 旧的父控件移除监听
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[self removeObservers];
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if (newSuperview) { // 新的父控件
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// 设置宽度
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self.mj_w = newSuperview.mj_w;
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// 设置位置
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self.mj_x = 0;
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// 记录UIScrollView
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_scrollView = (UIScrollView *)newSuperview;
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// 设置永远支持垂直弹簧效果
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_scrollView.alwaysBounceVertical = YES;
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// 记录UIScrollView最开始的contentInset
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_scrollViewOriginalInset = _scrollView.contentInset;
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// 添加监听
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[self addObservers];
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}
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}
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- (void)drawRect:(CGRect)rect
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{
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[super drawRect:rect];
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if (self.state == MJRefreshStateWillRefresh) {
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// 预防view还没显示出来就调用了beginRefreshing
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self.state = MJRefreshStateRefreshing;
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}
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}
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#pragma mark - KVO监听
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- (void)addObservers
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{
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NSKeyValueObservingOptions options = NSKeyValueObservingOptionNew | NSKeyValueObservingOptionOld;
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[self.scrollView addObserver:self forKeyPath:MJRefreshKeyPathContentOffset options:options context:nil];
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[self.scrollView addObserver:self forKeyPath:MJRefreshKeyPathContentSize options:options context:nil];
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self.pan = self.scrollView.panGestureRecognizer;
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[self.pan addObserver:self forKeyPath:MJRefreshKeyPathPanState options:options context:nil];
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}
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- (void)removeObservers
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{
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[self.superview removeObserver:self forKeyPath:MJRefreshKeyPathContentOffset];
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[self.superview removeObserver:self forKeyPath:MJRefreshKeyPathContentSize];;
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[self.pan removeObserver:self forKeyPath:MJRefreshKeyPathPanState];
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self.pan = nil;
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}
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- (void)observeValueForKeyPath:(NSString *)keyPath ofObject:(id)object change:(NSDictionary *)change context:(void *)context
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{
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// 遇到这些情况就直接返回
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if (!self.userInteractionEnabled) return;
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// 这个就算看不见也需要处理
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if ([keyPath isEqualToString:MJRefreshKeyPathContentSize]) {
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[self scrollViewContentSizeDidChange:change];
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}
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// 看不见
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if (self.hidden) return;
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if ([keyPath isEqualToString:MJRefreshKeyPathContentOffset]) {
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[self scrollViewContentOffsetDidChange:change];
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} else if ([keyPath isEqualToString:MJRefreshKeyPathPanState]) {
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[self scrollViewPanStateDidChange:change];
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}
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}
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- (void)scrollViewContentOffsetDidChange:(NSDictionary *)change{}
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- (void)scrollViewContentSizeDidChange:(NSDictionary *)change{}
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- (void)scrollViewPanStateDidChange:(NSDictionary *)change{}
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#pragma mark - 公共方法
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#pragma mark 设置回调对象和回调方法
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- (void)setRefreshingTarget:(id)target refreshingAction:(SEL)action
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{
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self.refreshingTarget = target;
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self.refreshingAction = action;
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}
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- (void)setState:(MJRefreshState)state
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{
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_state = state;
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// 加入主队列的目的是等setState:方法调用完毕、设置完文字后再去布局子控件
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dispatch_async(dispatch_get_main_queue(), ^{
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[self setNeedsLayout];
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});
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}
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#pragma mark 进入刷新状态
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- (void)beginRefreshing
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{
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[UIView animateWithDuration:MJRefreshFastAnimationDuration animations:^{
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self.alpha = 1.0;
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}];
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self.pullingPercent = 1.0;
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// 只要正在刷新，就完全显示
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if (self.window) {
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self.state = MJRefreshStateRefreshing;
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} else {
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// 预防正在刷新中时，调用本方法使得header inset回置失败
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if (self.state != MJRefreshStateRefreshing) {
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self.state = MJRefreshStateWillRefresh;
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// 刷新(预防从另一个控制器回到这个控制器的情况，回来要重新刷新一下)
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[self setNeedsDisplay];
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}
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}
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}
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- (void)beginRefreshingWithCompletionBlock:(void (^)())completionBlock
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{
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self.beginRefreshingCompletionBlock = completionBlock;
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[self beginRefreshing];
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}
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#pragma mark 结束刷新状态
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- (void)endRefreshing
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{
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self.state = MJRefreshStateIdle;
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}
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- (void)endRefreshingWithCompletionBlock:(void (^)())completionBlock
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{
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self.endRefreshingCompletionBlock = completionBlock;
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[self endRefreshing];
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}
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#pragma mark 是否正在刷新
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- (BOOL)isRefreshing
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{
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return self.state == MJRefreshStateRefreshing || self.state == MJRefreshStateWillRefresh;
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}
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#pragma mark 自动切换透明度
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- (void)setAutoChangeAlpha:(BOOL)autoChangeAlpha
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{
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self.automaticallyChangeAlpha = autoChangeAlpha;
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}
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- (BOOL)isAutoChangeAlpha
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{
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return self.isAutomaticallyChangeAlpha;
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}
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- (void)setAutomaticallyChangeAlpha:(BOOL)automaticallyChangeAlpha
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{
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_automaticallyChangeAlpha = automaticallyChangeAlpha;
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if (self.isRefreshing) return;
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if (automaticallyChangeAlpha) {
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self.alpha = self.pullingPercent;
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} else {
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self.alpha = 1.0;
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}
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}
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#pragma mark 根据拖拽进度设置透明度
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- (void)setPullingPercent:(CGFloat)pullingPercent
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{
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_pullingPercent = pullingPercent;
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if (self.isRefreshing) return;
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if (self.isAutomaticallyChangeAlpha) {
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self.alpha = pullingPercent;
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}
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}
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#pragma mark - 内部方法
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- (void)executeRefreshingCallback
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{
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dispatch_async(dispatch_get_main_queue(), ^{
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if (self.refreshingBlock) {
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self.refreshingBlock();
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}
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if ([self.refreshingTarget respondsToSelector:self.refreshingAction]) {
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MJRefreshMsgSend(MJRefreshMsgTarget(self.refreshingTarget), self.refreshingAction, self);
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}
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if (self.beginRefreshingCompletionBlock) {
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self.beginRefreshingCompletionBlock();
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}
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});
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}
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@end
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@implementation UILabel(MJRefresh)
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+ (instancetype)mj_label
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{
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UILabel *label = [[self alloc] init];
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label.font = MJRefreshLabelFont;
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label.textColor = MJRefreshLabelTextColor;
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label.autoresizingMask = UIViewAutoresizingFlexibleWidth;
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label.textAlignment = NSTextAlignmentCenter;
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label.backgroundColor = [UIColor clearColor];
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return label;
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}
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- (CGFloat)mj_textWith {
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CGFloat stringWidth = 0;
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CGSize size = CGSizeMake(MAXFLOAT, MAXFLOAT);
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if (self.text.length > 0) {
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#if defined(__IPHONE_OS_VERSION_MAX_ALLOWED) && __IPHONE_OS_VERSION_MAX_ALLOWED >= 70000
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stringWidth =[self.text
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boundingRectWithSize:size
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options:NSStringDrawingUsesLineFragmentOrigin
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attributes:@{NSFontAttributeName:self.font}
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context:nil].size.width;
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#else
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stringWidth = [self.text sizeWithFont:self.font
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constrainedToSize:size
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lineBreakMode:NSLineBreakByCharWrapping].width;
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#endif
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}
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return stringWidth;
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}
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@end
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