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void UIImageWriteToSavedPhotosAlbum ( |
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UIImage *image, |
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id completionTarget, |
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SEL completionSelector, |
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void *contextInfo |
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); |
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- (void) image: (UIImage *) image |
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didFinishSavingWithError: (NSError *) error |
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contextInfo: (void *) contextInfo; |
当我们需要异步获得图像保存结果的消息时，我们需要指定completionTarget对象以及其completionSelector对应的选择器。示例如下：
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- (void)saveImageToPhotos:(UIImage*)savedImage |
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{ |
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UIImageWriteToSavedPhotosAlbum(image, self, @selector(image:didFinishSavingWithError:contextInfo:), NULL); |
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} |
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// 指定回调方法 |
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- (void)image: (UIImage *) image didFinishSavingWithError: (NSError *) error contextInfo: (void *) contextInfo |
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{ |
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NSString *msg = nil ; |
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if(error != NULL){ |
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msg = @"保存图片失败" ; |
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}else{ |
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msg = @"保存图片成功" ; |
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} |
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UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"保存图片结果提示" |
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message:msg |
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delegate:self |
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cancelButtonTitle:@"确定" |
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otherButtonTitles:nil]; |
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[alert show]; |
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} |
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// 调用示例 |
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UIImage *savedImage = [UIImage imageNamed:"savedImage.png"]; |
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[self saveImageToPhotos:savedImage]; |
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原文地址：http://www.cnblogs.com/iOS-mt/p/4252077.html
