如何以编程方式截取iPhone的屏幕截图？
问题描述：
在目标C中，我们可以拍摄屏幕截图并在UIImage中存储此图像。
Is it possible in objective C that we can take the screen shot of screen and stored this image in UIImage.
答
您需要创建屏幕大小的位图上下文，并使用
You need to create a bitmap context of the size of your screen and use
[self.view.layer renderInContext:c]
复制您的视图。完成后，您可以使用
to copy your view in it. Once this is done, you can use
CGBitmapContextCreateImage(c)
从您的上下文创建一个CGImage。
to create a CGImage from your context.
详细说明：
CGSize screenSize = [[UIScreen mainScreen] applicationFrame].size;
CGColorSpaceRef colorSpaceRef = CGColorSpaceCreateDeviceRGB();
CGContextRef ctx = CGBitmapContextCreate(nil, screenSize.width, screenSize.height, 8, 4*(int)screenSize.width, colorSpaceRef, kCGImageAlphaPremultipliedLast);
CGContextTranslateCTM(ctx, 0.0, screenSize.height);
CGContextScaleCTM(ctx, 1.0, -1.0);
[(CALayer*)self.view.layer renderInContext:ctx];
CGImageRef cgImage = CGBitmapContextCreateImage(ctx);
UIImage *image = [UIImage imageWithCGImage:cgImage];
CGImageRelease(cgImage);
CGContextRelease(ctx);
[UIImageJPEGRepresentation(image, 1.0) writeToFile:@"screen.jpg" atomically:NO];
请注意，如果您运行代码以响应单击UIButton，您的图像将显示按钮。
Note that if you run your code in response to a click on a UIButton, your image will shows that button pressed.