将相机胶卷中的所有图像存储为数组

Question

I am very new to iOS and Objective-C, but I am trying to create an app that contains a component that takes all of the images from the camera roll and creates a slideshow from them. I believe the first step is to create an array from all of the images stored in the camera roll. Then I can create an animation from this array. Currently, I have a button, designated as "play", that when selected should display this slideshow as a UIImageView. However, my code does not work right now. Any help or suggestions would be greatly appreciated. Here is my code so far:

- (IBAction)play:(id)sender {
NSMutableArray *allPhotos= [[NSMutableArray alloc]init];
ALAssetsLibrary *library = [[ALAssetsLibrary alloc] init];

[library enumerateGroupsWithTypes:ALAssetsGroupSavedPhotos usingBlock:^(ALAssetsGroup *group, BOOL *stop) {

    [group setAssetsFilter:[ALAssetsFilter allPhotos]];
    [group enumerateAssetsUsingBlock:^(ALAsset *result, NSUInteger index, BOOL *stop) {
        if (result == nil) {
            return;
        }

        ALAssetRepresentation *representation = [result defaultRepresentation];
        UIImage *image = [UIImage imageWithCGImage:[representation fullScreenImage]];
        [allPhotos addObject:image];
    }];

} failureBlock: ^(NSError *error) {

    NSLog(@"No groups");
}];

UIImageView *animationImageView = [[UIImageView alloc] initWithFrame:CGRectMake(60, 95, 86, 193)];
animationImageView.animationImages = allPhotos;
animationImageView.animationDuration = 0.5;

[self.view addSubview:animationImageView];
[animationImageView startAnimating];

}

Answer 1

See my answer here I posted:

Since ALAssetsLibrary is deprecated now and Photo Framework is new one. I made my own function in Objective C to get all photos from Camera Roll and store in NSArray and displayed in my Collectionview

 NSArray *imageArray;
 NSMutableArray *mutableArray;

    -(void)getAllPhotosFromCamera
    {
        imageArray=[[NSArray alloc] init];
        mutableArray =[[NSMutableArray alloc]init];

        PHImageRequestOptions *requestOptions = [[PHImageRequestOptions alloc] init];
        requestOptions.resizeMode   = PHImageRequestOptionsResizeModeExact;
        requestOptions.deliveryMode = PHImageRequestOptionsDeliveryModeHighQualityFormat;
        requestOptions.synchronous = true;
        PHFetchResult *result = [PHAsset fetchAssetsWithMediaType:PHAssetMediaTypeImage options:nil];

        NSLog(@"%d",(int)result.count);

        PHImageManager *manager = [PHImageManager defaultManager];
        NSMutableArray *images = [NSMutableArray arrayWithCapacity:[result count]];

        // assets contains PHAsset objects.

        __block UIImage *ima;
        for (PHAsset *asset in result) {
            // Do something with the asset

            [manager requestImageForAsset:asset
                               targetSize:PHImageManagerMaximumSize
                              contentMode:PHImageContentModeDefault
                                  options:requestOptions
                            resultHandler:^void(UIImage *image, NSDictionary *info) {
                                ima = image;

                                [images addObject:ima];
                            }];


        }

        imageArray = [images copy];  // You can direct use NSMutuable Array images
    }