自动布局的高度在iOS8上工作，但在iOS7不工作 [英] Autolayout for Height working in iOS8 but not working in iOS7

问题描述

我有我在，将从服务器和下载完成，然后我的UIImageView高度后下载图像视图的UIImageView会根据图像的高度进行调整，但问题是它在iOS8上而不是在iOS7可以正常使用。在iOS7，该高度被缩放到比我试图设置更多。我通过IB设置自动布局

下面是我的code中的摘录（默认为250）

 如果（image.size.height＆LT; 250）headerView.itemImageView.contentMode = UIViewContentModeCenter;
                 其他{
                   adjustedHeight = image.size.height * 320.0f / image.size.width;
                     imageHeight = adjustedHeight;                     [headerView.heightContraintLayout setConstant：adjustedHeight];
                [headerView.itemImageView layoutIfNeeded]
 后//这行code的，我检查itemImageView的尺寸扩大比我在previous线设置（这只是发生在iOS7不iOS8上的adjestedHeight更多
 

解决方案

您设置图像视图的内容模式为中心。

尝试设置为看点填充，或根据需要达到什么样的缩放以填充。

I have my UIImageView in the view which will download image from server and after downloading finish then my UIImageView height will be adjusted according to height of image but the problem is it is working perfectly in iOS8 but not in iOS7. In iOS7, the height is scaled to much more than I tried to set. I am setting autolayout via IB

Here is the excerpt from my code (default is 250)

 if(image.size.height<250) headerView.itemImageView.contentMode =      UIViewContentModeCenter;
                 else{


                   adjustedHeight =      image.size.height*320.0f/image.size.width;


                     imageHeight = adjustedHeight;

                     [headerView.heightContraintLayout setConstant:adjustedHeight];
                [headerView.itemImageView layoutIfNeeded];
 //after this line of code, I check the size of itemImageView is extended more than the adjestedHeight that I set in the previous line ( this only happened in iOS7 not iOS8

解决方案

You set the image view's content mode to "centre".

Try setting it to "Aspect Fill" or "Scale to Fill" according to what you need to achieve.

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