如何在Swift 3中根据UIImage的大小/比例调整UIImageView的大小？ [英] How to resize UIImageView based on UIImage's size/ratio in Swift 3?

问题描述

请不要标记为重复，我没有找到考虑可用线程的解决方案。

Please do not mark as duplicate, I haven't found a solution considering available threads.

我有一个 UIImageView 并且用户可以以各种格式下载 UIImages 。问题是，我需要 UIImageView 根据给定的Image比例调整大小。

I have a UIImageView and the user is able to download UIImages in various formats. The issue is, that I need the UIImageView to resize based on the given Image's ratio.

目前我是使用 Aspect fit ，但 UIImageView 在其自身的大部分上仍然为空。我想让 UIImageView 根据其内容调整自身大小。例如，如果图片是1：1,4：3,6：2,16：9 ......

Currently I'm using Aspect fit, but the UIImageView remains empty on big parts of itself. I would like to have the UIImageView resize itself based on its content. E.g if the pic is 1:1, 4:3, 6:2, 16:9...

非常感谢帮助。

根据要求，这就是我想要的：

As requested, that is what I want:

我有一个 UIImageView 这是正方形，加载了16：7或其他任何图像，并且 UIImageView 调整大小以适合图像的大小......

I have had an UIImageView that was square, loaded with an Image in 16:7 or whatever and the UIImageView resized to fit the size of the Image...

推荐答案

看起来你想根据图像比例和容器视图的大小来调整ImageView的大小，这里是Swift中的例子（对不起，前一个答案）有一个错误，我修复了它）：

It looks like you want to resize an ImageView according to the image ratio and the container view's size, here is the example in Swift (Sorry,the former answer with a bug, I fixed it):

   let containerView = UIView(frame: CGRect(x:0,y:0,width:320,height:500))
   let imageView = UIImageView()

    if let image = UIImage(named: "a_image") {
        let ratio = image.size.width / image.size.height
        if containerView.frame.width > containerView.frame.height {
            let newHeight = containerView.frame.width / ratio
            imageView.frame.size = CGSize(width: containerView.frame.width, height: newHeight)
        }
        else{
            let newWidth = containerView.frame.height * ratio
            imageView.frame.size = CGSize(width: newWidth, height: containerView.frame.height)
        }
    }

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