Question

我是iOS和Objective-C的新手，但我正在尝试创建一个包含一个组件的应用程序，该组件从相机胶卷中获取所有图像并从中创建幻灯片。我相信第一步是从存储在相机胶卷中的所有图像创建一个数组。然后我可以从这个数组创建一个动画。目前，我有一个按钮，指定为“播放”，选中后应将此幻灯片显示为UIImageView。但是，我的代码现在不能正常工作。任何帮助或建议将不胜感激。到目前为止，这是我的代码：

- (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:

由于现在不推荐使用ALAssetsLibrary，而Photo Framework是新的。我在Objective C中创建了自己的函数来从Camera Roll获取所有照片并存储在NSArray中并显示在我的Collectionview中

 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
    }

将来自相机胶卷的所有图像存储为数组

1 个答案: