获取相册最后一张图(作为相册的入口)

在调用系统相册时，想提取系统相册最后一张图的缩略图作为相册入口的图，代码如下：

#pragma mark - 获取相册最后一张照片
- (void)GetLastestPhoto
{
ALAssetsLibrary *library = [[ALAssetsLibrary alloc] init];
__block UIImage *imagelast;
// Enumerate just the photos and videos group by using ALAssetsGroupSavedPhotos.
[library enumerateGroupsWithTypes:ALAssetsGroupSavedPhotos usingBlock:^(ALAssetsGroup *group, BOOL *stop) {
// Within the group enumeration block, filter to enumerate just photos.
[group setAssetsFilter:[ALAssetsFilter allPhotos]];
// Chooses the photo at the last index
[group enumerateAssetsWithOptions:NSEnumerationReverse usingBlock:^(ALAsset *alAsset, NSUInteger index, BOOL *innerStop) {
// The end of the enumeration is signaled by asset == nil.
if (alAsset) {
ALAssetRepresentation *representation = [alAsset defaultRepresentation];
UIImage *latestPhoto = [UIImage imageWithCGImage:[representation fullScreenImage]];
imagelast = latestPhoto;
// Stop the enumerations
*stop = YES; *innerStop = YES;
self.albumImageView.image = imagelast;
// Do something interesting with the AV asset.
//[self sendTweet:latestPhoto];
}
}];
} failureBlock: ^(NSError *error) {
// Typically you should handle an error more gracefully than this.
NSLog(@"No groups");
}];
}

 //相册入口
self.albumImageView = [[UIImageView alloc] init];
self.albumImageView.backgroundColor = [UIColor clearColor];
self.albumImageView.userInteractionEnabled = YES;
self.albumImageView.frame = DF_FRAME(DF_WIDTH-5-44, DF_BOTTOM_MENU_H/2-44/2, 44, 44);
UITapGestureRecognizer *singleTap =[[UITapGestureRecognizer alloc]initWithTarget:self action:@selector(showalbum:)];
[self.albumImageView addGestureRecognizer:singleTap];
[self GetLastestPhoto];
// 相册缩略图初始化
[view addSubview:self.albumImageView];

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