ios - 以方形格式保存照片
<p><p>我想在照片库中保存一张完美正方形的照片。这延伸到屏幕的整个宽度。我下面的代码将图像定位在正方形中，但我不知道如何使位置完美。我只是发布面具部分的代码。我没有把我的整个代码。我在保存图像时没有问题。 </p>
<p> <a href="/image/FGs6A.png" rel="noreferrer noopener nofollow"><img src="/image/FGs6A.png" alt="image"/></a> </p>
<pre><code>@IBAction func mask(_ sender: Any) {
let bottomImage:UIImage = UIImage(named: "backdropd")!
let newSize2 = CGSize(width: bottomImage.size.width, height: bottomImage.size.height)
UIGraphicsBeginImageContextWithOptions(newSize2, false, bottomImage.scale)
iflet rightz:UIImage = rightImage.image{
rightz.draw(in: CGRect(x: newSize2.width * 0.125,y: newSize2.height * 0.25,width: newSize2.width/1,height: newSize2.height/2), blendMode:CGBlendMode.normal, alpha:1.0)
}
let newImage:UIImage = UIGraphicsGetImageFromCurrentImageContext()!
UIGraphicsEndImageContext()
fullImage.image = newImage
}
</code></pre></p>
<br><hr><h1><strong>Best Answer-推荐答案</ strong></h1><br>
<p><p>首先，您必须从原始图像中切出一个正方形。假设图像是 <code>landscape</code> 模式图像。所以 <code>width > height</code>。所以生成的正方形图像大小将是 <code>height * height</code>。然后根据您的需要绘制图像，背景颜色为红色。 </p>
<p>以下代码是为 <code>landscape</code> 图像完成的。对于 <code>potrait</code> 图像，任务是相同的。</p>
<pre><code>let image = UIImage(named: "image")!
if image.size.width > image.size.height {
// assuming the image is landscape one
let sqrImgSize = image.size.height
let extraPortion = (image.size.width - sqrImgSize) / 2
let sqrPortionRect = CGRect(x: extraPortion,
y: 0,
width: sqrImgSize,
height: sqrImgSize)
// first of all, create the square image by cropping left right side out
UIGraphicsBeginImageContextWithOptions(CGSize(width: sqrImgSize, height: sqrImgSize), false, 0.0);
image.draw(at: CGPoint(x: -extraPortion, y: 0))
let sqrImage = UIGraphicsGetImageFromCurrentImageContext(); // here is your center cropped image
UIGraphicsEndImageContext();
// now if you are interested in filling the background with red, here it is
UIGraphicsBeginImageContextWithOptions(image.size, false, 0.0);
let context = UIGraphicsGetCurrentContext();
context?.beginPath()
context?.setFillColor(UIColor.red.cgColor)
context?.move(to: .zero)
context?.addRect(CGRect(origin: .zero, size: image.size))
context?.closePath()
context?.fillPath()
sqrImage!.draw(at: CGPoint(x: extraPortion, y: 0))
let sqrImageWithRedBackground = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
imageView.image = sqrImageWithRedBackground
} else {
// do as above with slight calculation changes
}
</code></pre>
<p><strong>示例</strong>
<a href="/image/8PYt0.png" rel="noreferrer noopener nofollow"><img src="/image/8PYt0.png" alt="enter image description here"/></a>
这里是带有黄色背景的 ImageView ，其中内容模式设置为宽高比合适。所以 ImageView 的背景颜色是可见的，因为纵横比不匹配。 </p>
<p><strong>我的输出</strong>
<a href="/image/oUGI3.png" rel="noreferrer noopener nofollow"><img src="/image/oUGI3.png" alt="enter image description here"/></a> </p>
<p><strong>说明</strong>
很明显，紫色是 <code>UIViewcontroller</code> 的 <code>view</code> 属性的背景色。黄色是 <code>UIImageView</code> 的背景色。红色部分是填充颜色，位于图像中心。 </p>
<p>希望它能达到你的目的。</p></p>
<p style="font-size: 20px;">关于ios - 以方形格式保存照片，我们在Stack Overflow上找到一个类似的问题：
<a href="https://stackoverflow.com/questions/54283847/" rel="noreferrer noopener nofollow" style="color: red;">
https://stackoverflow.com/questions/54283847/
</a>
</p>
页:
[1]