Ios 如何在swift中AspectFit UIView的背景图像?
当我将背景图像设置为图案图像时,图像是拉伸的,所以,我想将背景图像设置为纵横比,以适合此图案图像,那么,如何才能做到这一点Ios 如何在swift中AspectFit UIView的背景图像?,ios,swift,custom-keyboard,aspect-fit,Ios,Swift,Custom Keyboard,Aspect Fit,当我将背景图像设置为图案图像时,图像是拉伸的,所以,我想将背景图像设置为纵横比,以适合此图案图像,那么,如何才能做到这一点 let Image1 = UIImage(named: KeyboardBG_image) UIGraphicsBeginImageContext(keyboardview.frame.size); Image1?.draw(in: keyboardview.bounds); let image = UIGraphicsGetImageFromCu
let Image1 = UIImage(named: KeyboardBG_image)
UIGraphicsBeginImageContext(keyboardview.frame.size);
Image1?.draw(in: keyboardview.bounds);
let image = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
self.view.backgroundColor = UIColor(patternImage: image!)
谢谢。在
AVFoundation
中有一种方法可以帮助您在保持纵横比的同时创建特定大小的rect图像。这将根据您提供的大小计算rect大小,因为原始图像是横向图像,所以我使用了最大高度
/* create the image at original size */
let image1 = UIImage(named: "Landscape-1276x800.jpg")!
/*
* create bounding rect with largest possible height based on width
* this will get you the aspect height for the specified width
*/
let boundingRect = CGRect(x: 0, y: 0, width: 200, height:CGFloat.greatestFiniteMagnitude)
/*
* Returns a scaled CGRect that maintains the aspect ratio specified
* by a CGSize within a bounding CGRect
*/
let aspectRect = AVMakeRect(aspectRatio: image1.size, insideRect: boundingRect)
/*
* create a UIGraphicsImageRenderer to draw the image, this replaces all
* the UIGraphicsContext stuff that was used to draw images
*/
let renderer = UIGraphicsImageRenderer(size: aspectRect.size)
/*
* WARNING be careful about the origin points, if the result of the calculation
* is an exponential value like 8.988465674311579e+307, then the image won't draw.
* To be safe I set the origin to .zero
*/
let img = renderer.image { (context) in
image1.draw(in: CGRect(origin: .zero, size: aspectRect.size))
}
您是否将视图的
cliptobunds
设置为true?可能的副本请查看使用UIColor(patternImage:)制作图案颜色,并将该颜色设置为UIView的backgroundColor
。