捕获UIView并保存为图像
首先在UIImageView上添加UILable ，然后在截图UIView ，图像不正确的捕获UIView帧，我也附加图像的URL。
1）原始图片链接： –
2）捕获图像链接后： –
代码： –
UIGraphicsBeginImageContext(viewImage.frame.size); [viewImage.layer renderInContext:UIGraphicsGetCurrentContext()]; UIImage *vwImage = UIGraphicsGetImageFromCurrentImageContext(); UIGraphicsEndImageContext(); NSData *data=UIImagePNGRepresentation(vwImage); NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES); NSString *documentsDirectory = [paths objectAtIndex:0]; // NSString *imgName = [NSString stringWithFormat:imagename]; NSString *strPath = [documentsDirectory stringByAppendingPathComponent:imagename]; [data writeToFile:strPath atomically:YES];
你可以截取任何UIView的截图或捕获任何UIView ，并将其保存为下面的代码图像。
- (UIImage *)captureView { //hide controls if needed CGRect rect = [self.view bounds]; UIGraphicsBeginImageContext(rect.size); CGContextRef context = UIGraphicsGetCurrentContext(); [self.view.layer renderInContext:context]; UIImage *img = UIGraphicsGetImageFromCurrentImageContext(); UIGraphicsEndImageContext(); return img; }
拍摄一个UIView的快照
将你的视图传递给这个函数，它将自己处理所有东西（ 不需要设置边界或框架 ）
- (UIImage *)takeSnapshotOfView:(UIView *)view { UIGraphicsBeginImageContext(CGSizeMake(view.frame.size.width, view.frame.size.height)); [view drawViewHierarchyInRect:CGRectMake(0, 0, view.frame.size.width, view.frame.size.height) afterScreenUpdates:YES]; UIImage *image = UIGraphicsGetImageFromCurrentImageContext(); UIGraphicsEndImageContext(); return image; }
Swift 3版本：
func takeSnapshotOfView(view:UIView) -> UIImage? { UIGraphicsBeginImageContext(CGSize(width: view.frame.size.width, height: view.frame.size.height)) view.drawHierarchy(in: CGRect(x: 0.0, y: 0.0, width: view.frame.size.width, height: view.frame.size.height), afterScreenUpdates: true) let image = UIGraphicsGetImageFromCurrentImageContext() UIGraphicsEndImageContext() return image }
你可以使用下面的代码来
UIGraphicsBeginImageContext(pictureView.bounds.size); [pictureView.layer renderInContext:UIGraphicsGetCurrentContext()]; UIImage *viewImage = UIGraphicsGetImageFromCurrentImageContext(); UIGraphicsEndImageContext(); UIImageWriteToSavedPhotosAlbum(viewImage, nil, nil, nil);
像这样尝试，
UIGraphicsBeginImageContext(viewImage.frame.size); CGContextRef ctx = UIGraphicsGetCurrentContext(); [[UIColor blackColor] set]; CGContextFillRect(ctx, viewImage.frame); [viewImage.layer renderInContext:UIGraphicsGetCurrentContext()]; UIImage *vwImage = UIGraphicsGetImageFromCurrentImageContext(); UIGraphicsEndImageContext(); NSData *data=UIImagePNGRepresentation(vwImage); NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES); NSString *documentsDirectory = [paths objectAtIndex:0]; // NSString *imgName = [NSString stringWithFormat:imagename]; NSString *strPath = [documentsDirectory stringByAppendingPathComponent:imagename]; [data writeToFile:strPath atomically:YES];