collectionView瀑布流效果，图片高度自适应，可以后台返回高度，或者从后台返回的图片地址去获取图片高度 ##实现往下滑动导航栏透明度渐变的效果 仿QQ空间效果展示 #使用方法 ##1、导入头文件#import "XWWaterFlowLayout.h" 这个是重写了collectionview的布局方法 ##2、写布局属性并且实现协议代理 XWWaterFlowLayout *layout = [[XWWaterFlowLayout alloc]init]; layout.delegate = self; layout.columnsCount = 2; UICollectionView *collectionView = [[UICollectionView alloc]initWithFrame:CGRectMake(0, 64, self.view.frame.size.width, self.view.frame.size.height) collectionViewLayout:layout]; #实现协议的代理方法 #pragma mark -XWWaterFlowLayoutDelegate- -(CGFloat) waterFlowLayout:(XWWaterFlowLayout *)waterFlowLayout heightForWidth:(CGFloat)width atIndexPath:(NSIndexPath *)indexPath{
ImageModel *model = self.dataArray[indexPath.item];
CGFloat height = [[NSString stringWithFormat:@"%@",model.coverHeight] integerValue];
CGFloat Width = [[NSString stringWithFormat:@"%@",model.coverWidth] integerValue];
NSLog(@"height = %lf,widht = %lf,scale = %lf",height,Width,height/Width*width);
return height/Width *width;
}
#效果