iOS第三方左对齐布局类——UICollectionViewLeftAlignedLayout

摘要: 进行UICollectionView左对齐布局的帮助类。

iOS第三方左对齐布局类——UICollectionViewLeftAlignedLayout

UICollectionViewLeftAlignedLayout是第三方的左对齐布局管理类，其继承自UICollectionViewFlowLayout，使用其可以方便的进行左对齐的瀑布流界面布局。

UICollectionViewLeftAlignedLayout的git地址如下：https://github.com/mokagio/UICollectionViewLeftAlignedLayout。

使用示例如下：

#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

效果如下：



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