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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：https://github.com/rs/SDWebImage

实现效果及框架：

xib文件：Class是与之相联系的文件

代码部分：
Modal部分
CollectionModal.h

#import <Foundation/Foundation.h>@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~

View部分
collectionView.h

#import <UIKit/UIKit.h>
#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

Controller部分
collectionViewController.h

#import <UIKit/UIKit.h>@interface CollectionViewController : UIViewController<UICollectionViewDelegateFlowLayout,UICollectionViewDataSource>
//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cellUINib *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;
}

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;
}

关于数据有想要的。能够评论或私信~哈哈~