iOS中的瀑布流(RootCollectionViewControlle)

用了三个第三方

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
    self.window = [[[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]] autorelease];
    // Override point for customization after application launch.
    
    //创建一个负责布局的对象
    UICollectionViewWaterfallLayout *waterFlow = [[UICollectionViewWaterfallLayout alloc] init];
    
    //1.设置每个Cell的宽度
    waterFlow.itemWidth = ([UIScreen mainScreen].bounds.size.width - 30) / 2;
    //2.设置分区的边框范围
    waterFlow.sectionInset = UIEdgeInsetsMake(10, 10, 10, 10);
    //3.设置行和列的间距
    waterFlow.minLineSpacing = 10;
    

    RootCollectionViewController *rootVC = [[RootCollectionViewController alloc] initWithCollectionViewLayout:waterFlow];
    
    UINavigationController *navVC = [[UINavigationController alloc] initWithRootViewController:rootVC];
    
    //4.设置代理
    waterFlow.delegate = rootVC;
    
    
    
    
    
    
    self.window.rootViewController = rootVC;
    [rootVC release];
    [navVC release];
    [waterFlow release];
    
    
    
    
    
    
    
    
    
    self.window.backgroundColor = [UIColor whiteColor];
    [self.window makeKeyAndVisible];
    return YES;
}

RootCollectionViewController.h服从代理

#import <UIKit/UIKit.h>
#import "UICollectionViewWaterfallLayout.h"
@interface RootCollectionViewController : UICollectionViewController<UICollectionViewDelegateWaterfallLayout>

@end

#import "RootCollectionViewController.h"
#import "GoodFoodCell.h"
#import "AFNetworking.h"
#import "GondFoot.h"
#import "UIImageView+WebCache.h"


#define kWidth_Cell_iamgeView   ([UIScreen mainScreen].bounds.size.width - 30) / 2


@interface RootCollectionViewController ()
@property (nonatomic, retain) NSMutableArray *dataSource; //数据源
@end

@implementation RootCollectionViewController

- (void)dealloc{
    self.dataSource = nil;
    [super dealloc];
}

- (NSMutableArray *)dataSource{
    if (!_dataSource) {
        self.dataSource = [NSMutableArray arrayWithCapacity:1];
    }
    return [[_dataSource retain] autorelease];
}

static NSString * const reuseIdentifier = @"Cell";

- (void)viewDidLoad {
    [super viewDidLoad];
    
    // Uncomment the following line to preserve selection between presentations
    // self.clearsSelectionOnViewWillAppear = NO;
    
    // Register cell classes
    [self.collectionView registerClass:[GoodFoodCell class] forCellWithReuseIdentifier:reuseIdentifier];
    
    // Do any additional setup after loading the view.
    [self getData];
}

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

//pragma mark -- 数据处理
//进行网络请求
- (void)getData{
    AFHTTPRequestOperationManager *manger= [AFHTTPRequestOperationManager manager];
    [manger GET:@"http://api.meishixing.com/picture/picturelist/last/page=1&city_id=13&session_id=000012ccc15955056ce39798d33df97a40f1cc" parameters:nil success:^(AFHTTPRequestOperation *operation, id responseObject) {
        //数据处理
        [self dataMangerFromDictionaay:responseObject];
    } failure:^(AFHTTPRequestOperation *operation, NSError *error) {
        
    }];
}


//数据处理
- (void)dataMangerFromDictionaay:(NSDictionary *)datadic{
    NSArray *array = datadic[@"result"];
    for (NSDictionary *tempDic in array) {
        //将 tempDic 封装成 OC对象
        GondFoot *food = [[GondFoot alloc] init];
        //使用KVC 进行赋值
        [food setValuesForKeysWithDictionary:tempDic];
        //将封装好的 Model 添加到数据源
        [self.dataSource addObject:food];
        
    }
    //刷新数据
    [self.collectionView reloadData];
}

//每个cell高度代理
- (CGFloat)collectionView:(UICollectionView *)collectionView
                   layout:(UICollectionViewWaterfallLayout *)collectionViewLayout
 heightForItemAtIndexPath:(NSIndexPath *)indexPath{
#warning 假数据
    //取出对应的Model 数据
    GondFoot *food = self.dataSource[indexPath.item];
    
    return kWidth_Cell_iamgeView * food.image_height.floatValue / food.image_width.floatValue;
    
    
   // return 100;
}


/*
#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.
}
*/

#pragma mark <UICollectionViewDataSource>

- (NSInteger)numberOfSectionsInCollectionView:(UICollectionView *)collectionView {
#warning Incomplete method implementation -- Return the number of sections
    return 1;
}


- (NSInteger)collectionView:(UICollectionView *)collectionView numberOfItemsInSection:(NSInteger)section {
    return self.dataSource.count;
}

- (UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath {
    GoodFoodCell *cell = [collectionView dequeueReusableCellWithReuseIdentifier:reuseIdentifier forIndexPath:indexPath];
    
    // Configure the cell
    
    GondFoot *food = self.dataSource[indexPath.item];
    
    [cell.imageView sd_setImageWithURL:[NSURL URLWithString:food.picture_url] placeholderImage:nil];
    
    return cell;
}

@end

#import "GoodFoodCell.h"

@implementation GoodFoodCell

- (instancetype)initWithFrame:(CGRect)frame{
    self = [super initWithFrame:frame];
    if (self) {
        [self.contentView addSubview:self.imageView];
    }
    return self;
}



- (UIImageView *)imageView{
    if (!_imageView) {
        self.imageView = [[[UIImageView alloc] initWithFrame:self.bounds] autorelease];
    }
    return [[_imageView retain] autorelease];
}

- (void)layoutSubviews{
    [super layoutSubviews];
    self.imageView.frame = self.bounds;
}

- (void)dealloc{
    self.imageView = nil;
    [super dealloc];
}
@end