我有以下的While循环，它会询问用户输入，然后在打印之前反复询问它＆＃39; hello＆＃39;。我想做的是向用户询问// Manually created context produces wrong shadow.
let bitmapInfo = CGBitmapInfo(rawValue: CGImageAlphaInfo.premultipliedFirst.rawValue | CGBitmapInfo.byteOrder32Little.rawValue)
if let ctx1 = CGContext(data: nil, width: Int(view.bounds.width * UIScreen.main.scale), height: Int(view.bounds.height * UIScreen.main.scale), bitsPerComponent: 8, bytesPerRow: Int(4 * view.bounds.width * UIScreen.main.scale), space: CGColorSpaceCreateDeviceRGB(), bitmapInfo: bitmapInfo.rawValue) {
ctx1.scaleBy(x: UIScreen.main.scale, y: -UIScreen.main.scale)
ctx1.translateBy(x: 0, y: -view.bounds.height)
view.layer.render(in: ctx1)
guard let image = ctx1.makeImage() else {
return
}
UIImageWriteToSavedPhotosAlbum(UIImage(cgImage: image), nil, nil, nil)
}
// Context created using UIGraphicsBeginImageContextWithOptions produces correct shadow.
UIGraphicsBeginImageContextWithOptions(view.bounds.size, false, UIScreen.main.scale)
if let ctx2 = UIGraphicsGetCurrentContext() {
view.layer.render(in: ctx2)
guard let image = ctx2.makeImage() else {
return
}
UIImageWriteToSavedPhotosAlbum(UIImage(cgImage: image), nil, nil, nil)
// Manually created context with configurations copied from the "good" context still produces wrong shadow.
if let ctx3 = CGContext(data: nil, width: ctx2.width, height: ctx2.height, bitsPerComponent: ctx2.bitsPerComponent, bytesPerRow: ctx2.bytesPerRow, space: ctx2.colorSpace!, bitmapInfo: ctx2.bitmapInfo.rawValue) {
ctx3.concatenate(ctx2.ctm)
view.layer.render(in: ctx3)
guard let image = ctx3.makeImage() else {
return
}
UIImageWriteToSavedPhotosAlbum(UIImage(cgImage: image), nil, nil, nil)
}
}
一次，然后运行while循环，而用户根本不需要输入任何内容并保持while循环运行直到用户输入{{1} }。
raw_input