//
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// MJCollectionViewController.m
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// BaseProject
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//
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// Created by WindShan on 2016/12/7.
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// Copyright © 2016年 WindShan. All rights reserved.
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//
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#import "MJCollectionViewController.h"
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#define MJPerformSelectorLeakWarning(Stuff) \
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do { \
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_Pragma("clang diagnostic push") \
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_Pragma("clang diagnostic ignored \"-Warc-performSelector-leaks\"") \
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Stuff; \
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_Pragma("clang diagnostic pop") \
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} while (0)
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static const CGFloat MJDuration = 2.0;
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/**
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* 随机色
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*/
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#define MJRandomColor [UIColor colorWithRed:arc4random_uniform(255)/255.0 green:arc4random_uniform(255)/255.0 blue:arc4random_uniform(255)/255.0 alpha:1]
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@interface MJCollectionViewController ()<UICollectionViewDelegate,UICollectionViewDataSource>
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/** 存放假数据 */
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@property (strong, nonatomic) NSMutableArray *colors;
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@property (nonnull,strong) UICollectionView *collectionView;
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@end
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@implementation MJCollectionViewController
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#pragma mark - 示例
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#pragma mark UICollectionView 上下拉刷新
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- (void)example21
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{
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__weak __typeof(self) weakSelf = self;
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// 下拉刷新
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self.collectionView.mj_header= [MJRefreshNormalHeader headerWithRefreshingBlock:^{
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// 增加5条假数据
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for (int i = 0; i<10; i++) {
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[weakSelf.colors insertObject:MJRandomColor atIndex:0];
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}
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// 模拟延迟加载数据，因此2秒后才调用（真实开发中，可以移除这段gcd代码）
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dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(MJDuration * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{
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[weakSelf.collectionView reloadData];
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// 结束刷新
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[weakSelf.collectionView.mj_header endRefreshing];
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});
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}];
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[self.collectionView.mj_header beginRefreshing];
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// 上拉刷新
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self.collectionView.mj_footer = [MJRefreshBackNormalFooter footerWithRefreshingBlock:^{
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// 增加5条假数据
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for (int i = 0; i<5; i++) {
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[weakSelf.colors addObject:MJRandomColor];
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}
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// 模拟延迟加载数据，因此2秒后才调用（真实开发中，可以移除这段gcd代码）
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dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(MJDuration * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{
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[weakSelf.collectionView reloadData];
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// 结束刷新
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[weakSelf.collectionView.mj_footer endRefreshing];
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});
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}];
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// 默认先隐藏footer
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self.collectionView.mj_footer.hidden = YES;
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}
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#pragma mark - 数据相关
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- (NSMutableArray *)colors
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{
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if (!_colors) {
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self.colors = [NSMutableArray array];
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}
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return _colors;
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}
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static NSString *const MJCollectionViewCellIdentifier = @"color";
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- (void)viewDidLoad {
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[super viewDidLoad];
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// Do any additional setup after loading the view.
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// UICollectionViewFlowLayout的初始化（与刷新控件无关）
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UICollectionViewFlowLayout *layout = [[UICollectionViewFlowLayout alloc] init];
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layout.itemSize = CGSizeMake(80, 80);
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layout.sectionInset = UIEdgeInsetsMake(20, 20, 20, 20);
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layout.minimumInteritemSpacing = 20;
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layout.minimumLineSpacing = 20;
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self.collectionView = [[UICollectionView alloc] initWithFrame:CGRectMake(0, 0, SCREEN_WIDTH, SCREEN_HEIGHT-64) collectionViewLayout:layout];
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[self.view addSubview:self.collectionView];
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self.collectionView.backgroundColor = [UIColor whiteColor];
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[self.collectionView registerClass:[UICollectionViewCell class] forCellWithReuseIdentifier:MJCollectionViewCellIdentifier];
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[self setMethod:self.title];
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// 根据方法名字调用该方法
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MJPerformSelectorLeakWarning(
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[self performSelector:NSSelectorFromString(self.method) withObject:nil];
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);
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}
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static char MethodKey;
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- (void)setMethod:(NSString *)method
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{
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objc_setAssociatedObject(self, &MethodKey, method, OBJC_ASSOCIATION_COPY_NONATOMIC);
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}
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- (NSString *)method
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{
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return objc_getAssociatedObject(self, &MethodKey);
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}
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- (void)didReceiveMemoryWarning {
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[super didReceiveMemoryWarning];
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// Dispose of any resources that can be recreated.
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}
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#pragma mark - collection数据源代理
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- (NSInteger)collectionView:(UICollectionView *)collectionView numberOfItemsInSection:(NSInteger)section
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{
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// 设置尾部控件的显示和隐藏
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//self.collectionView.mj_footer.hidden = self.colors.count == 0;
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return self.colors.count;
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}
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- (UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath
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{
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UICollectionViewCell *cell = [collectionView dequeueReusableCellWithReuseIdentifier:MJCollectionViewCellIdentifier forIndexPath:indexPath];
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cell.backgroundColor = self.colors[indexPath.row];
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return cell;
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}
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- (void)collectionView:(UICollectionView *)collectionView didSelectItemAtIndexPath:(NSIndexPath *)indexPath
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{
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// MJTestViewController *test = [[MJTestViewController alloc] init];
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// if (indexPath.row % 2) {
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// [self.navigationController pushViewController:test animated:YES];
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// } else {
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// UINavigationController *nav = [[UINavigationController alloc] initWithRootViewController:test];
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// [self presentViewController:nav animated:YES completion:nil];
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// }
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}
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/*
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#pragma mark - Navigation
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// In a storyboard-based application, you will often want to do a little preparation before navigation
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- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender {
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// Get the new view controller using [segue destinationViewController].
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// Pass the selected object to the new view controller.
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}
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*/
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@end
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