计算图片的宽和高 动态设置图片的位置

  切记 : 计算图片的高度和宽度应该在请求数据的时候获取.然后保存起来 否则的话会造成卡顿现象     

 

方法优化:

    WidthAndHeight *wAndH = _widthAndHeightDataArray[indexPath.row];
   
    CGFloat width = wAndH.widthPic;
   
    CGFloat height = wAndH.heightPic;
   
    CGRect picBackViewFrame = cell.picBackView.frame;
    cell.picBackView.frame = CGRectMake(0, picBackViewFrame.origin.y, SCREEN_WIDTH, SCREEN_WIDTH);

    cell.postPhoto.frame = CGRectMake(width / 2 > SCREEN_WIDTH ? 0 : ((SCREEN_WIDTH - width / 2) / 2), height / 2 > SCREEN_WIDTH ? 0 : ((SCREEN_WIDTH - height / 2) / 2), width / 2 > SCREEN_WIDTH ? SCREEN_WIDTH : (width / 2), height / 2 > SCREEN_WIDTH ? SCREEN_WIDTH : (height / 2));