本文介绍了在Swift中用纯色创建UIImage的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
我想以编程方式创建一个由纯色填充的UIImage。任何人都知道如何在Swift中执行此操作?
I want to programmatically create an UIImage filled by a solid color. Anyone have an idea of how to do this in Swift?
推荐答案
另一个不错的解决方案, Swift 2.2 兼容,就是在UIImage中创建另一个构造函数,这样:
Another nice solution, Swift 2.2 compatible, is to create another constructor in UIImage, in this way:
public extension UIImage {
public convenience init?(color: UIColor, size: CGSize = CGSize(width: 1, height: 1)) {
let rect = CGRect(origin: .zero, size: size)
UIGraphicsBeginImageContextWithOptions(rect.size, false, 0.0)
color.setFill()
UIRectFill(rect)
let image = UIGraphicsGetImageFromCurrentImageContext()
UIGraphicsEndImageContext()
guard let cgImage = image?.CGImage else { return nil }
self.init(CGImage: cgImage)
}
}
这样你可以用这种方式创建自定义彩色图像:
In this way you can create the custom colored-image in this way:
let redImage = UIImage(color: .redColor())
或者,可选择使用自定义尺寸创建图像:
Or, optionally, create the image with a custom size:
let redImage200x200 = UIImage(color: .redColor(), size: CGSize(width: 200, height: 200))
Swift 3.0
public extension UIImage {
public convenience init?(color: UIColor, size: CGSize = CGSize(width: 1, height: 1)) {
let rect = CGRect(origin: .zero, size: size)
UIGraphicsBeginImageContextWithOptions(rect.size, false, 0.0)
color.setFill()
UIRectFill(rect)
let image = UIGraphicsGetImageFromCurrentImageContext()
UIGraphicsEndImageContext()
guard let cgImage = image?.cgImage else { return nil }
self.init(cgImage: cgImage)
}
}
这篇关于在Swift中用纯色创建UIImage的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持!