如何将图片保存到iPhone照片库？

Question

我需要做什么才能将我的程序生成的图像(可能是相机,可能不是)保存到iPhone上的系统照片库？

Answer 1

你可以使用这个功能:

UIImageWriteToSavedPhotosAlbum(UIImage *image, 
                               id completionTarget, 
                               SEL completionSelector, 
                               void *contextInfo);

如果要在保存完成时收到通知,则只需要completionTarget,completionSelector和contextInfoUIImage,否则可以传入nil.

请参阅官方文档UIImageWriteToSavedPhotosAlbum().

Answer 2

在iOS 9.0中不推荐使用.

使用iOS 4.0+ AssetsLibrary框架,使用UIImageWriteToSavedPhotosAlbum方法可以做得更快

    ALAssetsLibrary *library = [[ALAssetsLibrary alloc] init];

    [library writeImageToSavedPhotosAlbum:[image CGImage] orientation:(ALAssetOrientation)[image imageOrientation] completionBlock:^(NSURL *assetURL, NSError *error){
    if (error) {
    // TODO: error handling
    } else {
    // TODO: success handling
    }
}];
[library release];

Answer 3

最简单的方法是:

UIImageWriteToSavedPhotosAlbum(myUIImage, nil, nil, nil);

对于Swift,您可以参考使用swift保存到iOS照片库

Answer 4

要记住的一件事:如果您使用回调,请确保您的选择符符合以下形式:

- (void) image: (UIImage *) image didFinishSavingWithError: (NSError *) error contextInfo: (void *) contextInfo;

否则,您将崩溃,例如以下错误:

[NSInvocation setArgument:atIndex:]: index (2) out of bounds [-1, 1]

Answer 5

只需将数组中的图像传递给它即可

-(void) saveMePlease {

//Loop through the array here
for (int i=0:i<[arrayOfPhotos count]:i++){
         NSString *file = [arrayOfPhotos objectAtIndex:i];
         NSString *path = [get the path of the image like you would in DOCS FOLDER or whatever];
         NSString *imagePath = [path stringByAppendingString:file];
         UIImage *image = [[[UIImage alloc] initWithContentsOfFile:imagePath]autorelease];

         //Now it will do this for each photo in the array
         UIImageWriteToSavedPhotosAlbum(image, nil, nil, nil);
        }
}

抱歉打字错误有点刚刚做了这个,但你明白了