使用以下代码时,它会获取我的最后一张图片,但会复制它。它总是得到最后一张图片,但它成对返回:
UIImageView *imageView = (UIImageView *) [self.photoCollectionView viewWithTag:101];
PHFetchOptions *fetchOptions = [[PHFetchOptions alloc] init];
fetchOptions.sortDescriptors = @[[NSSortDescriptor sortDescriptorWithKey:@"creationDate" ascending:YES]];
PHFetchResult *fetchResult = [PHAsset fetchAssetsWithMediaType:PHAssetMediaTypeImage options:fetchOptions];
PHAsset *lastAsset = [fetchResult lastObject];
[[PHImageManager defaultManager] requestImageForAsset:lastAsset
targetSize:imageView.bounds.size
contentMode:PHImageContentModeAspectFill
options:nil
resultHandler:^(UIImage *result, NSDictionary *info) {
NSLog(@"PHImageManager request results %@ and info %@", result, info);
dispatch_async(dispatch_get_main_queue(), ^{
[user_photos addObject:result];
NSLog(@"%lu",user_photos.count);
[self.photoCollectionView reloadData];
NSLog(@"%lu",user_photos.count);
});
}];
为什么会发生这种情况?以下是日志语句:
2015-09-06 21:48:22.153[41357:11390462] PHImageManager request results <UIImage: 0x7fd1336b8f40>, {60, 40} and info {
PHImageFileOrientationKey = 0;
PHImageResultDeliveredImageFormatKey = 4031;
PHImageResultIsDegradedKey = 1;
PHImageResultRequestIDKey = 1;
PHImageResultWantedImageFormatKey = 5003;
}
2015-09-06 21:48:22.158[41357:11390462] 2
2015-09-06 21:48:22.159[41357:11390462] 2
2015-09-06 21:48:22.166[41357:11390462] PHImageManager request results <UIImage: 0x7fd13374c3b0>, {386, 256} and info {
PHImageFileOrientationKey = 0;
PHImageResultDeliveredImageFormatKey = 5003;
PHImageResultIsDegradedKey = 0;
PHImageResultRequestIDKey = 1;
PHImageResultWantedImageFormatKey = 5003;
}
2015-09-06 21:48:22.167[41357:11390462] 3
2015-09-06 21:48:22.167[41357:11390462] 3
这发生在模拟器和设备上。不使用第 3 方软件,没关系,我想。为什么会被调用两次?我在 uialertaction 块中调用它