iOS第三方左對齊佈局類——UICollectionViewLeftAlignedLayout

iOS第三方左對齊佈局類——UICollectionViewLeftAlignedLayout

        UICollectionViewLeftAlignedLayout是第三方的左對齊佈局管理類，其繼承自UICollectionViewFlowLayout，使用其能夠方便的進行左對齊的瀑布流界面佈局。

        UICollectionViewLeftAlignedLayout的git地址以下：https://github.com/mokagio/UICollectionViewLeftAlignedLayout。

        使用示例以下：

#import <UICollectionViewLeftAlignedLayout.h>
@interface ViewController ()<UICollectionViewDataSource,UICollectionViewDelegateFlowLayout>
@property(nonatomic,strong)UICollectionView * collectionView;
@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.
    UICollectionViewLeftAlignedLayout* layout = [[UICollectionViewLeftAlignedLayout alloc]init];
    self.collectionView = [[UICollectionView alloc]initWithFrame:self.view.frame collectionViewLayout:layout];
    self.collectionView.dataSource = self;
    self.collectionView.delegate=self;
    [self.collectionView registerClass:[UICollectionViewCell class] forCellWithReuseIdentifier:@"cellID"];
    [self.view addSubview:self.collectionView];
}

-(CGSize)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout *)collectionViewLayout sizeForItemAtIndexPath:(NSIndexPath *)indexPath{
    return CGSizeMake(arc4random()%100+50, 100);
}

-(NSInteger)numberOfSectionsInCollectionView:(UICollectionView *)collectionView{
    return 1;
}
-(NSInteger)collectionView:(UICollectionView *)collectionView numberOfItemsInSection:(NSInteger)section{
    return 10;
}
-(UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath{
    UICollectionViewCell * cell = [collectionView dequeueReusableCellWithReuseIdentifier:@"cellID" forIndexPath:indexPath];
    cell.backgroundColor = [UIColor colorWithRed:arc4random()%255/255.0 green:arc4random()%255/255.0 blue:arc4random()%255/255.0 alpha:1];
    return cell;
}
@end

效果以下：

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