ios - PHImageManager 的方法 "requestImageDataForAsset"在 Swift 中导致崩溃

Question

我正在使用 PHImageManagers 的 requestImageDataForAsset 来计算相机胶卷中特定照片的内存大小。它在我的设备上运行良好，但一些用户在计算内存大小(通过分析和崩溃报告发现)后出现大量崩溃。

code and crash report

请帮忙。

Answer 1

它在哪个 iOS 版本上崩溃，似乎在 iOS 8.3 中对我来说工作正常，如果你使用相同的过程来获取图像元数据或内存大小:-

--------------------------------------------------------------
-- get the UIImage instance from a PHAsset
--------------------------------------------------------------

- (UIImage*)grabImageFromAsset:(PHAsset *)asset
{
    __block UIImage *returnImage;
    PHImageRequestOptions *options = [[PHImageRequestOptions alloc] init];
    options.synchronous = YES;
    [[PHImageManager defaultManager] requestImageForAsset:asset
                                               targetSize:CGSizeMake(200, 200)
                                              contentMode:PHImageContentModeAspectFill
                                                  options:options
                                            resultHandler:
     ^(UIImage *result, NSDictionary *info) {
         returnImage = result;
     }];
    return returnImage;
}

--------------------------------------------------------------
-- get the metadata of the image from a PHAsset
--------------------------------------------------------------

- (NSDictionary *)grabImageDataFromAsset:(PHAsset *)asset
{
    __block NSMutableDictionary *imageAssetInfo = [NSMutableDictionary new];
    PHImageRequestOptions *options = [[PHImageRequestOptions alloc] init];
    options.synchronous = YES;
    [[PHImageManager defaultManager] requestImageDataForAsset:asset
                                                      options:options
                                                resultHandler:
     ^(NSData *imageData, NSString *dataUTI, UIImageOrientation orientation, NSDictionary *info) {
         if ([info[@"PHImageResultIsInCloudKey"] isEqual:@YES]) {
             // in the cloud
             NSLog(@"in the cloud (sync grabImageDataFromAsset)");
         }
         imageAssetInfo = [info mutableCopy];
         if (imageData) {
             imageAssetInfo[@"IMAGE_NSDATA"] = imageData;
         }
     }];
    return imageAssetInfo;
}

我正在关注我的照片套件操作的链接:- phimagemanager和 ios-8-photokit