iOS中获取系统相册中的图片实例

@interface ViewController () <UIImagePickerControllerDelegate, UINavigationControllerDelegate>

- (void)getImageFromIpc{  // 1.判断相册是否可以打开  if (![UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypePhotoLibrary]) return;  // 2. 创建图片选择控制器  UIImagePickerController *ipc = [[UIImagePickerController alloc] init];  /**   typedef NS_ENUM(NSInteger, UIImagePickerControllerSourceType) {   UIImagePickerControllerSourceTypePhotoLibrary, // 相册   UIImagePickerControllerSourceTypeCamera, // 用相机拍摄获取   UIImagePickerControllerSourceTypeSavedPhotosAlbum // 相簿   }   */  // 3. 设置打开照片相册类型(显示所有相簿)   ipc.sourceType = UIImagePickerControllerSourceTypePhotoLibrary;  // ipc.sourceType = UIImagePickerControllerSourceTypeSavedPhotosAlbum;  // 照相机  // ipc.sourceType = UIImagePickerControllerSourceTypeCamera;  // 4.设置代理  ipc.delegate = self;  // 5.modal出这个控制器  [self presentViewController:ipc animated:YES completion:nil];}#pragma mark -- <UIImagePickerControllerDelegate>--// 获取图片后的操作- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary<NSString *,id> *)info{  // 销毁控制器  [picker dismissViewControllerAnimated:YES completion:nil];  // 设置图片  self.imageView.image = info[UIImagePickerControllerOriginalImage];}

#import <AssetsLibrary/AssetsLibrary.h>

- (void)getOriginalImages{  // 获得所有的自定义相簿  PHFetchResult<PHAssetCollection *> *assetCollections = [PHAssetCollection fetchAssetCollectionsWithType:PHAssetCollectionTypeAlbum subtype:PHAssetCollectionSubtypeAlbumRegular options:nil];  // 遍历所有的自定义相簿  for (PHAssetCollection *assetCollection in assetCollections) {    [self enumerateAssetsInAssetCollection:assetCollection original:YES];  }  // 获得相机胶卷  PHAssetCollection *cameraRoll = [PHAssetCollection fetchAssetCollectionsWithType:PHAssetCollectionTypeSmartAlbum subtype:PHAssetCollectionSubtypeSmartAlbumUserLibrary options:nil].lastObject;  // 遍历相机胶卷,获取大图  [self enumerateAssetsInAssetCollection:cameraRoll original:YES];}

- (void)getThumbnailImages{  // 获得所有的自定义相簿  PHFetchResult<PHAssetCollection *> *assetCollections = [PHAssetCollection fetchAssetCollectionsWithType:PHAssetCollectionTypeAlbum subtype:PHAssetCollectionSubtypeAlbumRegular options:nil];  // 遍历所有的自定义相簿  for (PHAssetCollection *assetCollection in assetCollections) {    [self enumerateAssetsInAssetCollection:assetCollection original:NO];  }  // 获得相机胶卷  PHAssetCollection *cameraRoll = [PHAssetCollection fetchAssetCollectionsWithType:PHAssetCollectionTypeSmartAlbum subtype:PHAssetCollectionSubtypeSmartAlbumUserLibrary options:nil].lastObject;  [self enumerateAssetsInAssetCollection:cameraRoll original:NO];}

/** * 遍历相簿中的所有图片 * @param assetCollection 相簿 * @param original    是否要原图 */- (void)enumerateAssetsInAssetCollection:(PHAssetCollection *)assetCollection original:(BOOL)original{  NSLog(@"相簿名:%@", assetCollection.localizedTitle);  PHImageRequestOptions *options = [[PHImageRequestOptions alloc] init];  // 同步获得图片, 只会返回1张图片  options.synchronous = YES;  // 获得某个相簿中的所有PHAsset对象  PHFetchResult<PHAsset *> *assets = [PHAsset fetchAssetsInAssetCollection:assetCollection options:nil];  for (PHAsset *asset in assets) {    // 是否要原图    CGSize size = original ? CGSizeMake(asset.pixelWidth, asset.pixelHeight) : CGSizeZero;    // 从asset中获得图片    [[PHImageManager defaultManager] requestImageForAsset:asset targetSize:size contentMode:PHImageContentModeDefault options:options resultHandler:^(UIImage * _Nullable result, NSDictionary * _Nullable info) {      NSLog(@"%@", result);    }];  }}