我的代码在普通设备上工作正常，但在视网膜设备上产生模糊的图像。
有人知道我的问题的解决方案吗?
+ (UIImage *) imageWithView:(UIView *)view
{
UIGraphicsBeginImageContext(view.bounds.size);
[view.layer renderInContext:UIGraphicsGetCurrentContext()];
UIImage * img = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
return img;
}
当前回答
下面是一个基于@Dima的答案的Swift 4 UIView扩展。
extension UIView {
func snapshotImage() -> UIImage? {
UIGraphicsBeginImageContextWithOptions(bounds.size, isOpaque, 0)
drawHierarchy(in: bounds, afterScreenUpdates: false)
let image = UIGraphicsGetImageFromCurrentImageContext()
UIGraphicsEndImageContext()
return image
}
}
其他回答
- (UIImage*)screenshotForView:(UIView *)view
{
UIGraphicsBeginImageContext(view.bounds.size);
[view.layer renderInContext:UIGraphicsGetCurrentContext()];
UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
// hack, helps w/ our colors when blurring
NSData *imageData = UIImageJPEGRepresentation(image, 1); // convert to jpeg
image = [UIImage imageWithData:imageData];
return image;
}
对于Swift 5.1，你可以使用这个扩展:
extension UIView {
func asImage() -> UIImage {
let renderer = UIGraphicsImageRenderer(bounds: bounds)
return renderer.image { layer.render(in: $0.cgContext) }
}
}
在这个方法中，只需要传递一个view对象它就会返回一个UIImage对象。
-(UIImage*)getUIImageFromView:(UIView*)yourView
{
UIGraphicsBeginImageContext(yourView.bounds.size);
[yourView.layer renderInContext:UIGraphicsGetCurrentContext()];
UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
return image;
}
使用现代的uigraphicsimagerender
public extension UIView {
@available(iOS 10.0, *)
public func renderToImage(afterScreenUpdates: Bool = false) -> UIImage {
let rendererFormat = UIGraphicsImageRendererFormat.default()
rendererFormat.opaque = isOpaque
let renderer = UIGraphicsImageRenderer(size: bounds.size, format: rendererFormat)
let snapshotImage = renderer.image { _ in
drawHierarchy(in: bounds, afterScreenUpdates: afterScreenUpdates)
}
return snapshotImage
}
}
斯威夫特3
带有UIView扩展的Swift 3解决方案(基于Dima的回答)应该是这样的:
extension UIView {
public func getSnapshotImage() -> UIImage {
UIGraphicsBeginImageContextWithOptions(self.bounds.size, self.isOpaque, 0)
self.drawHierarchy(in: self.bounds, afterScreenUpdates: false)
let snapshotImage: UIImage = UIGraphicsGetImageFromCurrentImageContext()!
UIGraphicsEndImageContext()
return snapshotImage
}
}
