ios - 将图像大小调整为 Aspect Fit
<p><p>我正在尝试使用以下流行代码调整图像大小，它正在调整图像大小，但它正在将图像大小调整为 <code>Scale to Fill</code>，我想将它们调整为 <code>Aspect Fit .</code> 我该怎么做？</p>
<pre><code>func resizeImage(image: UIImage, newSize: CGSize) -> (UIImage) {
let newRect = CGRect(x: 0, y: 0, width: newSize.width, height: newSize.height).integral
UIGraphicsBeginImageContextWithOptions(newSize, true, 0)
let context = UIGraphicsGetCurrentContext()
// Set the quality level to use when rescaling
context!.interpolationQuality = CGInterpolationQuality.default
let flipVertical = CGAffineTransform(a: 1, b: 0, c: 0, d: -1, tx: 0, ty: newSize.height )
context!.concatenate(flipVertical)
// Draw into the context; this scales the image
context?.draw(image.cgImage!, in: CGRect(x: 0.0,y: 0.0, width: newRect.width, height: newRect.height))
let newImageRef = context!.makeImage()! as CGImage
let newImage = UIImage(cgImage: newImageRef)
// Get the resized image from the context and a UIImage
UIGraphicsEndImageContext()
return newImage
}
</code></pre>
<p>我已经将图片的内容模式设置为<code>Aspect Fit</code>，但还是不行。</p>
<p>这就是我在 Collection ViewController 中调用上述代码的方式</p>
<pre><code> cell.imageView.image =UIImage(named: dogImages)?.resizeImage(image: UIImage(named: dogImages)
</code></pre>
<p>我在 Storyboard 中手动选择了我的图像并将其内容模式设置为 <code>apsect fit</code></p></p>
<br><hr><h1><strong>Best Answer-推荐答案</ strong></h1><br>
<p><p>您是否尝试将 newSize 设置为原始图像大小的纵横比。如果要固定宽度，则按宽度计算高度，如果要固定高度，则按高度计算宽度</p>
<p>当宽度固定时计算高度:</p>
<pre><code> let fixedWidth: CGFloat = 200
let newHeight = fixedWidth * image.size.height / image.size.width
let convertedImage = resizeImage(image: image, newSize: CGSize(width: fixedWidth, height: newHeight))
</code></pre>
<p>在固定高度时计算宽度:</p>
<pre><code> let fixedheight: CGFloat = 200
let newWidth = fixedheight * image.size.width / image.size.height
let convertedImage = resizeImage(image: image, newSize: CGSize(width: newWidth, height: fixedheight))
</code></pre>
<p>您可以使用此调整后的图像与宽高比。</p>
<p>还可以查看答案:<a href="https://stackoverflow.com/a/8858464/2677551" rel="noreferrer noopener nofollow">https://stackoverflow.com/a/8858464/2677551</a> ，这可能会有所帮助</p></p>
<p style="font-size: 20px;">关于ios - 将图像大小调整为 Aspect Fit，我们在Stack Overflow上找到一个类似的问题：
<a href="https://stackoverflow.com/questions/46678242/" rel="noreferrer noopener nofollow" style="color: red;">
https://stackoverflow.com/questions/46678242/
</a>
</p>
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