获取iPhone相册的照片

加入 AssetsLibrary.framework
导入头文件 #import

1.数据源，即所有相册的照片
if (!self.assets) {_assets = [[NSMutableArray alloc] init];
} else {[self.assets removeAllObjects];
}ALAssetsGroupEnumerationResultsBlock assetsEnumerationBlock = ^(ALAsset *result, NSUInteger index, BOOL *stop) {if (result) {[self.assets addObject:result];}
};ALAssetsFilter *onlyPhotosFilter = [ALAssetsFilter allPhotos];
[self.assetsGroup setAssetsFilter:onlyPhotosFilter];
[self.assetsGroup enumerateAssetsUsingBlock:assetsEnumerationBlock];

以 UICollectionViewController为例显示相册的照片

2.显示在CollectionView上
- (NSInteger)collectionView:(UICollectionView *)view numberOfItemsInSection:(NSInteger)section {return self.assets.count;
}
- (UICollectionViewCell *)collectionView:(UICollectionView *)cv cellForItemAtIndexPath:(NSIndexPath *)indexPath {static NSString *CellIdentifier = @"photoCell";UICollectionViewCell *cell = [cv dequeueReusableCellWithReuseIdentifier:CellIdentifier forIndexPath:indexPath];// load the asset for this cellALAsset *asset = self.assets[indexPath.row];CGImageRef thumbnailImageRef = [asset thumbnail];UIImage *thumbnail = [UIImage imageWithCGImage:thumbnailImageRef];// apply the image to the cellUIImageView *imageView = (UIImageView *)[cell viewWithTag:kImageViewTag];imageView.image = thumbnail;return cell;
}

获得的ALAsset对象就是相片对象：其中有相片的缩略图，全屏图，高清图，url等属性。

ALAsset *result = [assets objectAtIndex:index];获取url：String类型：NSString *url = [[[resultdefaultRepresentation]url]description];URL类型：NSURL *url = [[result defaultRepresentation]url];获取缩略图：CGImageRef  ref = [result thumbnail];UIImage *img = [[UIImage alloc]initWithCGImage:ref];获取全屏相片：CGImageRef ref = [[result  defaultRepresentation]fullScreenImage];UIImage *img = [[UIImage alloc]initWithCGImage:ref];获取高清相片：CGImageRef ref = [[result  defaultRepresentation]fullResolutionImage];UIImage *img = [[UIImage alloc]initWithCGImage:ref];获取相册的标示照片：ALAssetsGroup *group = [groups objectAtIndex:index];CGImageRef posterImageRef = [group posterImage];UIImage *posterImage = [UIImageimageWithCGImage:posterImageRef];获取相册中的所有对象（相片和录像等）：group = (ALAssetsGroup*)[assetGroups objectAtIndex:index];[group setAssetsFilter:[ALAssetsFilter allAssets]];[group enumerateAssetsUsingBlock:^(ALAsset *result, NSUIntegerindex, BOOL *stop){if(result == nil){return;}//获取相片的url：NSString *url = [[[resultdefaultRepresentation]url]description];[self.urls addObject:url];[self.assets addObject:result];}];

在tableview展示if (self.assetsLibrary == nil) {_assetsLibrary = [[ALAssetsLibrary alloc] init];}if (self.groups == nil) {_groups = [[NSMutableArray alloc] init];} else{[self.groups removeAllObjects];}// setup our failure view controller in case enumerateGroupsWithTypes failsALAssetsLibraryAccessFailureBlock failureBlock = ^(NSError *error) {AssetsDataIsInaccessibleViewController *assetsDataInaccessibleViewController =[self.storyboard instantiateViewControllerWithIdentifier:@"inaccessibleViewController"];NSString *errorMessage = nil;switch ([error code]) {case ALAssetsLibraryAccessUserDeniedError:case ALAssetsLibraryAccessGloballyDeniedError:errorMessage = @"The user has declined access to it.";break;default:errorMessage = @"Reason unknown.";break;}assetsDataInaccessibleViewController.explanation = errorMessage;[self presentViewController:assetsDataInaccessibleViewController animated:NO completion:nil];};// emumerate through our groups and only add groups that contain photosALAssetsLibraryGroupsEnumerationResultsBlock listGroupBlock = ^(ALAssetsGroup *group, BOOL *stop) {ALAssetsFilter *onlyPhotosFilter = [ALAssetsFilter allPhotos];[group setAssetsFilter:onlyPhotosFilter];if ([group numberOfAssets] > 0){[self.groups addObject:group];}else{[self.tableView performSelectorOnMainThread:@selector(reloadData) withObject:nil waitUntilDone:NO];}};// enumerate only photosNSUInteger groupTypes = ALAssetsGroupAlbum | ALAssetsGroupEvent | ALAssetsGroupFaces | ALAssetsGroupSavedPhotos;[self.assetsLibrary enumerateGroupsWithTypes:groupTypes usingBlock:listGroupBlock failureBlock:failureBlock];
}

// determine the number of rows in the table view
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {

return self.groups.count;

}

// determine the appearance of table view cells
- (UITableViewCell )tableView:(UITableView )tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {

static NSString *CellIdentifier = @"Cell";UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier forIndexPath:indexPath];ALAssetsGroup *groupForCell = self.groups[indexPath.row];
CGImageRef posterImageRef = [groupForCell posterImage];
UIImage *posterImage = [UIImage imageWithCGImage:posterImageRef];
cell.imageView.image = posterImage;
cell.textLabel.text = [groupForCell valueForProperty:ALAssetsGroupPropertyName];
cell.detailTextLabel.text = [@(groupForCell.numberOfAssets) stringValue];return cell;
｝

“`

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