//
//  MJCollectionViewController.m
//  BaseProject
//
//  Created by WindShan on 2016/12/7.
//  Copyright © 2016年 WindShan. All rights reserved.
//

#import "MJCollectionViewController.h"
#define MJPerformSelectorLeakWarning(Stuff) \
do { \
_Pragma("clang diagnostic push") \
_Pragma("clang diagnostic ignored \"-Warc-performSelector-leaks\"") \
Stuff; \
_Pragma("clang diagnostic pop") \
} while (0)

static const CGFloat MJDuration = 2.0;
/**
 * 随机色
 */
#define MJRandomColor [UIColor colorWithRed:arc4random_uniform(255)/255.0 green:arc4random_uniform(255)/255.0 blue:arc4random_uniform(255)/255.0 alpha:1]


@interface MJCollectionViewController ()<UICollectionViewDelegate,UICollectionViewDataSource>

/** 存放假数据 */
@property (strong, nonatomic) NSMutableArray *colors;
@property (nonnull,strong) UICollectionView *collectionView;
@end

@implementation MJCollectionViewController

#pragma mark - 示例
#pragma mark UICollectionView 上下拉刷新
- (void)example21
{
    __weak __typeof(self) weakSelf = self;
    
    // 下拉刷新
    self.collectionView.mj_header= [MJRefreshNormalHeader headerWithRefreshingBlock:^{
        // 增加5条假数据
        for (int i = 0; i<10; i++) {
            [weakSelf.colors insertObject:MJRandomColor atIndex:0];
        }
        
        // 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）
        dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(MJDuration * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{
            [weakSelf.collectionView reloadData];
            
            // 结束刷新
            [weakSelf.collectionView.mj_header endRefreshing];
        });
    }];
    [self.collectionView.mj_header beginRefreshing];
    
    // 上拉刷新
    self.collectionView.mj_footer = [MJRefreshBackNormalFooter footerWithRefreshingBlock:^{
        // 增加5条假数据
        for (int i = 0; i<5; i++) {
            [weakSelf.colors addObject:MJRandomColor];
        }
        
        // 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）
        dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(MJDuration * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{
            [weakSelf.collectionView reloadData];
            
            // 结束刷新
            [weakSelf.collectionView.mj_footer endRefreshing];
        });
    }];
    // 默认先隐藏footer
    self.collectionView.mj_footer.hidden = YES;
}

#pragma mark - 数据相关
- (NSMutableArray *)colors
{
    if (!_colors) {
        self.colors = [NSMutableArray array];
    }
    return _colors;
}

static NSString *const MJCollectionViewCellIdentifier = @"color";

- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view.
    
    // UICollectionViewFlowLayout的初始化（与刷新控件无关）
    UICollectionViewFlowLayout *layout = [[UICollectionViewFlowLayout alloc] init];
    layout.itemSize = CGSizeMake(80, 80);
    layout.sectionInset = UIEdgeInsetsMake(20, 20, 20, 20);
    layout.minimumInteritemSpacing = 20;
    layout.minimumLineSpacing = 20;
    
    self.collectionView = [[UICollectionView alloc] initWithFrame:CGRectMake(0, 0, SCREEN_WIDTH, SCREEN_HEIGHT-64) collectionViewLayout:layout];
    
    [self.view addSubview:self.collectionView];
    
    self.collectionView.backgroundColor = [UIColor whiteColor];
    [self.collectionView registerClass:[UICollectionViewCell class] forCellWithReuseIdentifier:MJCollectionViewCellIdentifier];
    
    [self setMethod:self.title];
    
    // 根据方法名字调用该方法
    MJPerformSelectorLeakWarning(
                                 [self performSelector:NSSelectorFromString(self.method) withObject:nil];
                                 );
}

static char MethodKey;
- (void)setMethod:(NSString *)method
{
    objc_setAssociatedObject(self, &MethodKey, method, OBJC_ASSOCIATION_COPY_NONATOMIC);
}

- (NSString *)method
{
    return objc_getAssociatedObject(self, &MethodKey);
}

- (void)didReceiveMemoryWarning {
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

#pragma mark - collection数据源代理
- (NSInteger)collectionView:(UICollectionView *)collectionView numberOfItemsInSection:(NSInteger)section
{
    // 设置尾部控件的显示和隐藏
    //self.collectionView.mj_footer.hidden = self.colors.count == 0;
    return self.colors.count;
}

- (UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath
{
    UICollectionViewCell *cell = [collectionView dequeueReusableCellWithReuseIdentifier:MJCollectionViewCellIdentifier forIndexPath:indexPath];
    cell.backgroundColor = self.colors[indexPath.row];
    return cell;
}

- (void)collectionView:(UICollectionView *)collectionView didSelectItemAtIndexPath:(NSIndexPath *)indexPath
{
//    MJTestViewController *test = [[MJTestViewController alloc] init];
//    if (indexPath.row % 2) {
//        [self.navigationController pushViewController:test animated:YES];
//    } else {
//        UINavigationController *nav = [[UINavigationController alloc] initWithRootViewController:test];
//        [self presentViewController:nav animated:YES completion:nil];
//    }
}

/*
#pragma mark - Navigation

// In a storyboard-based application, you will often want to do a little preparation before navigation
- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender {
    // Get the new view controller using [segue destinationViewController].
    // Pass the selected object to the new view controller.
}
*/

@end