问题描述
UIImageView 不正确地呈现图像的大小.使用 Scale Aspect Fit，如果 UIImageView 是正方形，则图像的宽高比正确，图像未填充的区域具有透明度.
UIImageView renders the size of an image incorrectly. Using Scale Aspect Fit, if the UIImageView is a square the image is the correct aspect ratio with transparency in the areas the image does not fill.
//Image is Square & Correct Size
var imageView = UIImageView(frame: CGRectMake(0, 50, 320, 320))
imageView.clipsToBounds = true
imageView.contentMode = UIViewContentMode.ScaleAspectFit
//Image is Rectangle & Incorrect Size
var imageView = UIImageView(frame: CGRectMake(0, 50, 320, 450))
imageView.clipsToBounds = true
imageView.contentMode = UIViewContentMode.ScaleAspectFit
UIImageView 需要在屏幕的顶部和底部触摸边缘并有透明空间，并且内部的图像需要保持其原始比例而不是拉伸更高.我附上了两张图片，说明 UIImageView 内的图像是如何呈现的.
The UIImageView needs to touch the edges and have transparent space at the top and bottom of the screen and the image inside needs to keep its original ratio rather than stretching taller. I have attached two images of how the image inside the UIImageView is rendering.
推荐答案
我向 UIImageView 添加了一个自动调整大小的蒙版，它现在显示正确的比例.
I added an autoresizing mask to the UIImageView and it now displays the correct ratios.
imageView.autoresizingMask = UIViewAutoresizing.FlexibleBottomMargin | UIViewAutoresizing.FlexibleHeight | UIViewAutoresizing.FlexibleRightMargin | UIViewAutoresizing.FlexibleLeftMargin | UIViewAutoresizing.FlexibleTopMargin | UIViewAutoresizing.FlexibleWidth
imageView.contentMode = UIViewContentMode.ScaleAspectFit
这个答案帮助了我:使用 AVCaptureSession sessionPreset = 拉伸捕获的照片AVCaptureSessionPresetPhoto 因为我使用的是通过手机相机拍摄的图像.
This answer helped me: Captured photo is stretched with AVCaptureSession sessionPreset = AVCaptureSessionPresetPhoto as I was using an image that was taken through the phones camera.
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