// 1.截图
UIImage *image = [UIImage captureWithView:self.paintView];
// 2.保存到图片
UIImageWriteToSavedPhotosAlbum(image, self, @selector(image:didFinishSavingWithError:contextInfo:), nil);
/**
保存图片操作之后就会调用
*/
- (void)image:(UIImage *)image didFinishSavingWithError:(NSError *)error contextInfo:(void *)contextInfo
{
if (error) { // 保存失败
[MBProgressHUD showError:@"保存失败"];
} else { // 保存成功
[MBProgressHUD showSuccess:@"保存成功"];
}
}
+ (instancetype)captureWithView:(UIView *)view { // 1.开启上下文 UIGraphicsBeginImageContextWithOptions(view.frame.size, NO, 0.0); // 2.将控制器view的layer渲染到上下文 [view.layer renderInContext:UIGraphicsGetCurrentContext()]; // 3.取出图片 UIImage *newImage = UIGraphicsGetImageFromCurrentImageContext(); // 4.结束上下文 UIGraphicsEndImageContext(); return newImage; }
原文：http://www.cnblogs.com/yinshenge/p/4560486.html