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数据来源于豆瓣网~仅供学习交流~

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本实例练习用到了SDWebImage框架：实现从网络端下载图片的功能

下载地址：

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实现效果及框架：

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xib文件：Class是与之相联系的文件

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代码部分：

Modal部分

CollectionModal.h

#import 
      
       @interface CollectionModal : NSObject@property (nonatomic,retain) NSDictionary *images;@property (nonatomic,copy) NSString *title;@end
      

CollectionModal.m 能够什么都不写，也能够重写description来调试用~

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View部分

collectionView.h

#import 
      
       #import "CollectionModal.h"@interface CollectionCell : UICollectionViewCell//与xib文件相关联@property (weak, nonatomic) IBOutlet UIImageView *movieImage;@property (weak, nonatomic) IBOutlet UILabel *nameLabel;//数据@property (nonatomic,retain) CollectionModal *modal;@end
      

collectionView.m

#import "CollectionCell.h"#import "UIImageView+WebCache.h"@implementation CollectionCell- (void)awakeFromNib {    // Initialization code}- (void)setModal:(CollectionModal *)modal {    _modal = modal;    [self setNeedsLayout];}//布局，当modal赋值以后，调用此函数- (void)layoutSubviews {        [super layoutSubviews];//不要忘了父类方法，不然非常easy出乱七八糟的错误    _nameLabel.text = _modal.title;    NSString *str = _modal.images[@"medium"];    [_movieImage sd_setImageWithURL:[NSURL URLWithString:str]];}@end

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Controller部分

collectionViewController.h

#import 
      
       @interface CollectionViewController : UIViewController
       
        //不要忘了遵循协议{    UICollectionView *_collectionView;    NSMutableArray *_modalArray;}@end
       
      

#import "CollectionViewController.h"#import "CollectionModal.h"#import "CollectionCell.h"#define Zwidth [UIScreen mainScreen].bounds.size.width#define Zheight [UIScreen mainScreen].bounds.size.height@interface CollectionViewController ()@end@implementation CollectionViewController- (void)viewDidLoad {    [super viewDidLoad];    [self _loadData];    [self _creatCollectionView];    // Do any additional setup after loading the view.}#pragma mark - Data//文件解析。载入数据- (void)_loadData {    NSString *fliePath = [[NSBundle mainBundle] pathForResource:@"exercise" ofType:@"json"];    NSData *data = [NSData dataWithContentsOfFile:fliePath];    NSDictionary *dataDic = [NSJSONSerialization JSONObjectWithData:data options:NSJSONReadingMutableContainers error:nil];    //    NSLog(@"%@",dataDic);    _modalArray = [NSMutableArray array];    NSArray *subjects = dataDic[@"subjects"];    for (NSDictionary *dic in subjects) {        CollectionModal *modal = [[CollectionModal alloc] init];        modal.images = dic[@"images"];        modal.title = dic[@"title"];        //        NSLog(@"%@",modal);        [_modalArray addObject:modal];//将文件载入到数据数组中    }}#pragma mark - collectionView//创建collectionView- (void)_creatCollectionView {    UICollectionViewFlowLayout *layout = [[UICollectionViewFlowLayout alloc] init];    layout.minimumInteritemSpacing = 1;//内部cell之间距离    layout.minimumLineSpacing = 10;//行间距    layout.itemSize = CGSizeMake((Zwidth-4)/3, 200);    layout.scrollDirection = UICollectionViewScrollDirectionVertical;//滚动方向设置    _collectionView = [[UICollectionView alloc] initWithFrame:CGRectMake(0, 0, Zwidth, Zheight) collectionViewLayout:layout];    //代理设置    _collectionView.dataSource = self;    _collectionView.delegate = self;    [self.view addSubview:_collectionView];    //注冊cell    UINib *nib = [UINib nibWithNibName:@"CollectionCell" bundle:[NSBundle mainBundle]];    [_collectionView registerNib:nib forCellWithReuseIdentifier:@"cell"];}//协议方法的实现，以下两个方法是必须实现的- (NSInteger)collectionView:(UICollectionView *)collectionView numberOfItemsInSection:(NSInteger)section {    return _modalArray.count;}- (UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath {    //这里包括cell的复用思想    CollectionCell *cell = [collectionView dequeueReusableCellWithReuseIdentifier:@"cell" forIndexPath:indexPath];    CollectionModal *modal = _modalArray[indexPath.row];    cell.modal = modal;    return cell;}

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AppDelegate.m

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {    self.window = [[UIWindow alloc] initWithFrame:[UIScreen mainScreen].bounds];    self.window.backgroundColor = [UIColor whiteColor];    [self.window makeKeyAndVisible];    CollectionViewController *vc = [[CollectionViewController alloc] init];    self.window.rootViewController = vc;    // Override point for customization after application launch.    return YES;}

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关于数据有想要的。能够评论或私信~哈哈~