blocks|key|2058019|text|你可以手动计算适合你的图像的UIImageView的框架尺寸，或者使用AVMakeRectWithAspectRatioInsideRect(来自AVFoundation的方法)。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2058020|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

You may calculate it manually for UIImageView's frame sizes that Aspect Fit with your image, or use AVMakeRectWithAspectRatioInsideRect(method from AVFoundation).

blocks|key|1561047|text|因此，假设您将一个UIImageView设置为相对于视图的宽度相等。重绘图像的一种方法是使用Core+Graphics。您所要做的就是计算您需要重新绘制图像以适合的比例因子。你可以在这里找到一些很棒的示例：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1561048|https://github.com/natecook1000/Image-Resizing/blob/master/Image%2520Resizing/ImageResizingMethods.swift|offset|length|1561049|这是一个很好的教程，有基准测试可以更好地理解事物：|1561050|http://nshipster.com/image-resizing/|1561051|我使用的代码示例(基本上是github方法中的一个，根据我的需要进行了修改)：|1561052|++++++++++++let+image+=+UIImage(data:+data!)
++++++++++++let+oldWidth+=+image!.size.width
++++++++++++let+scaleFactor+=+UIWindow().screen.bounds.width+/+oldWidth
++++++++++++let+cgImage+=+image!.CGImage

++++++++++++let+width+=+Double(CGImageGetWidth(cgImage))+*+Double(scaleFactor)
++++++++++++let+height+=+Double(CGImageGetHeight(cgImage))+*+Double(scaleFactor)
++++++++++++let+bitsPerComponent+=+CGImageGetBitsPerComponent(cgImage)
++++++++++++let+bytesPerRow+=+CGImageGetBytesPerRow(cgImage)
++++++++++++let+colorSpace+=+CGImageGetColorSpace(cgImage)
++++++++++++let+bitmapInfo+=+CGImageGetBitmapInfo(cgImage)

++++++++++++let+context+=+CGBitmapContextCreate(nil,+Int(width),+Int(height),+bitsPerComponent,+bytesPerRow,+colorSpace,+bitmapInfo.rawValue)

++++++++++++CGContextSetInterpolationQuality(context,+.High)

++++++++++++CGContextDrawImage(context,+CGRect(origin:+CGPointZero,+size:+CGSize(width:+CGFloat(width),+height:+CGFloat(height))),+cgImage)

++++++++++++let+scaledImage+=+CGBitmapContextCreateImage(context).flatMap+{+return+UIImage(CGImage:+$0)+}
++++++++++++imageView.image+=+scaledImage|code-block|syntax|javascript|1561053|entityMap|0|LINK|mutability|MUTABLE|url|https://github.com/natecook1000/Image-Resizing/blob/master/Image%2520Resizing/ImageResizingMethods.swift|1^0|0|0|2U|0|0|0|0|10|1|0|0|0^^$0|@$1|2|3|4|5|6|7|Z|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|10|8|@]|9|@$D|11|E|12|1|13]]|A|$]]|$1|F|3|G|5|6|7|14|8|@]|9|@]|A|$]]|$1|H|3|I|5|6|7|15|8|@]|9|@$D|16|E|17|1|18]]|A|$]]|$1|J|3|K|5|6|7|19|8|@]|9|@]|A|$]]|$1|L|3|M|5|N|7|1A|8|@]|9|@]|A|$O|P]]|$1|Q|3|-4|5|6|7|1B|8|@]|9|@]|A|$]]]|R|$S|$5|T|U|V|A|$W|X]]|Y|$5|T|U|V|A|$W|I]]]]

So, let's say you have a UIImageView set to equal width in relation to the view.
One way to redraw your image to fit would be to use Core Graphics.
What you do is calculate the scale factor you need to redraw the image to fit properly.
You can find some great samples here :

<a href="https://github.com/natecook1000/Image-Resizing/blob/master/Image%20Resizing/ImageResizingMethods.swift" rel="nofollow noreferrer">https://github.com/natecook1000/Image-Resizing/blob/master/Image%20Resizing/ImageResizingMethods.swift</a>

and a good tutorial with benchmarks to understand things better :

<a href="http://nshipster.com/image-resizing/" rel="nofollow noreferrer">http://nshipster.com/image-resizing/</a>

Sample of code i used (which is basically one of the github methods modify to suit my needs) :

<pre><code> let image = UIImage(data: data!)
 let oldWidth = image!.size.width
 let scaleFactor = UIWindow().screen.bounds.width / oldWidth
 let cgImage = image!.CGImage

 let width = Double(CGImageGetWidth(cgImage)) * Double(scaleFactor)
 let height = Double(CGImageGetHeight(cgImage)) * Double(scaleFactor)
 let bitsPerComponent = CGImageGetBitsPerComponent(cgImage)
 let bytesPerRow = CGImageGetBytesPerRow(cgImage)
 let colorSpace = CGImageGetColorSpace(cgImage)
 let bitmapInfo = CGImageGetBitmapInfo(cgImage)

 let context = CGBitmapContextCreate(nil, Int(width), Int(height), bitsPerComponent, bytesPerRow, colorSpace, bitmapInfo.rawValue)

 CGContextSetInterpolationQuality(context, .High)

 CGContextDrawImage(context, CGRect(origin: CGPointZero, size: CGSize(width: CGFloat(width), height: CGFloat(height))), cgImage)

 let scaledImage = CGBitmapContextCreateImage(context).flatMap { return UIImage(CGImage: $0) }
 imageView.image = scaledImage
</code></pre>

blocks|key|1689293|text|当你使用NSLayoutConstraint时，这太简单了|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1689294|++++let+imageView+=+UIImageView()
++++imageView.contentMode+=+.scaleAspectFit
++++view.addSubview(imageView)
++++imageView.translatesAutoresizingMaskIntoConstraints+=+false

++++imageView.centerXAnchor.constraint(equalTo:+view.centerXAnchor).isActive+=+true
++++imageView.centerYAnchor.constraint(equalTo:+view.centerYAnchor).isActive+=+true
++++imageView.widthAnchor.constraint(equalToConstant:+250).isActive+=+true
++++let+heightLayout+=+imageView.heightAnchor.constraint(equalToConstant:+250)
++++heightLayout.isActive+=+true


++++imageView.image+=+UIImage(named:+"SomeImage")
++++if+let+size+=+imageView.image?.size+{
++++++++heightLayout.constant+=+size.height+/+size.width+*+250+//+250+is+imageView+width
++++++++view.layoutIfNeeded()
++++}|code-block|syntax|javascript|1689295|entityMap^0|4|I|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@$9|N|A|O|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|P|8|@]|D|@]|E|$I|J]]|$1|K|3|-4|5|6|7|Q|8|@]|D|@]|E|$]]]|L|$]]

It's too easy when you are using <code>NSLayoutConstraint</code>

<pre><code> let imageView = UIImageView()
 imageView.contentMode = .scaleAspectFit
 view.addSubview(imageView)
 imageView.translatesAutoresizingMaskIntoConstraints = false

 imageView.centerXAnchor.constraint(equalTo: view.centerXAnchor).isActive = true
 imageView.centerYAnchor.constraint(equalTo: view.centerYAnchor).isActive = true
 imageView.widthAnchor.constraint(equalToConstant: 250).isActive = true
 let heightLayout = imageView.heightAnchor.constraint(equalToConstant: 250)
 heightLayout.isActive = true


 imageView.image = UIImage(named: "SomeImage")
 if let size = imageView.image?.size {
 heightLayout.constant = size.height / size.width * 250 // 250 is imageView width
 view.layoutIfNeeded()
 }
</code></pre>

I created a <code>UIImageView</code> and assigned it an <code>UIImage</code>. I set the UIImageView content mode to <code>Aspect Fit</code>. How do I remove the padding from the top and bottom of the image, or how do I resize the <code>UIImageView</code> to wrap around the image? I tried everything.

If you are going to say to get the new size of the image, it won't work. Getting the image size inside the <code>UIImageView</code> only gives the width and height of the original image. 

Please do not link other posts. I have read them already. They do not work.

<a href="https://i.stack.imgur.com/Ary5D.png" rel="noreferrer"><img src="https://i.stack.imgur.com/Ary5D.png" alt="enter image description here"></a>

How to remove spacing from UIImageView aspect fit in Swift

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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我创建了一个UIImageView并为其分配了一个UIImage。我将UIImageView内容模式设置为Aspect Fit。如何删除图像顶部和底部的填充，或者如何调整UIImageView的大小以环绕图像？我什么都试过了。如果你要说获取图像的新大小，它不会起作用。在UIImageView中获取图像大小只给出原始图像...

问如何在Swift中删除UIImageView aspect fit中的间距
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