[英]Unable to generate cgImage from UIGraphics
I am developing a game which needs to render tiled pipe form the previously loaded cgImage.我正在开发一个游戏,它需要从先前加载的 cgImage 中渲染平铺的 pipe。 For this purpose I am using the following code, however the resized image is not rendered Can someone give me an advice how to fix that?为此,我正在使用以下代码,但是未呈现调整大小的图像有人可以给我一个建议如何解决这个问题吗?
EDIT: to include minimal code for reproduction `编辑:包含最少的复制代码`
import SwiftUI
struct ContentView: View {
@State var reImage : UIImage?
var body: some View {
VStack {
Image("pipe-green")
.resizable()
.scaledToFit()
Image(uiImage: reImage!)
.resizable()
.scaledToFit()
Button("Resize") {
let sizeNew = CGSize(width: 100, height: 300)
reImage = resizeImage(textures: (pipe: "pipe-green", cap: "bottom-green"), of: sizeNew)
}
}
}
func resizeImage(textures: (pipe: String, cap: String), of size: CGSize) -> UIImage? {
guard let texture = UIImage(named: textures.pipe)?.cgImage else {
return nil
}
let textureRect = CGRect(x: 0, y: 0, width: size.width, height: size.height)
// Render tiled pipe form the previously loaded cgImage
UIGraphicsBeginImageContext(size)
let context = UIGraphicsGetCurrentContext()
context?.draw(texture, in: textureRect, byTiling: true)
let tiledBackground = UIGraphicsGetImageFromCurrentImageContext()
UIGraphicsEndImageContext()
return tiledBackground
}
} }
extension UIImage {
func resized (to size : CGSize) -> UIImage {
return UIGraphicsImageRenderer(size: size).image { _ in
draw(in: CGRect(origin: .zero, size: size))
}
}
}
Actually solved it by adding that extension.实际上通过添加该扩展来解决它。
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