使用最新的iOS9 开始推荐使用的<Photos/Photos.h>这个框架实现保存图片或者视频

获得自定义的所有相簿

// 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) {}

获得相机胶卷相簿

// 获得相机胶卷PHAssetCollection *cameraRoll = [PHAssetCollection fetchAssetCollectionsWithType:PHAssetCollectionTypeSmartAlbum subtype:PHAssetCollectionSubtypeSmartAlbumUserLibrary options:nil].lastObject;

获得某个相簿的缩略图

 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) {CGSize size = 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);}];}

获得某个相簿的原图

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) {CGSize size = CGSizeMake(asset.pixelWidth, asset.pixelHeight);// 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);}];}

利用UIImagePickerController挑选图片

// UIImagePickerController : 可以从系统自带的App(照片\相机)中获得图片// 判断相册是否可以打开if (![UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypePhotoLibrary]) return;UIImagePickerController *ipc = [[UIImagePickerController alloc] init];// 打开照片应用(显示所有相簿)ipc.sourceType = UIImagePickerControllerSourceTypePhotoLibrary;// 打开照片应用(只显示"时刻"这个相簿)// ipc.sourceType = UIImagePickerControllerSourceTypeSavedPhotosAlbum;// 照相机// ipc.sourceType = UIImagePickerControllerSourceTypeCamera;ipc.delegate = self;[self presentViewController:ipc animated:YES completion:nil];#pragma mark - <UIImagePickerControllerDelegate> - (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];}

NaN错误

- 错误起因:0被当做除数, 比如 10 / 0

最简单的方法保存图片到相机胶卷

 UIImageWriteToSavedPhotosAlbum(self.imageView.image, self, @selector(image:didFinishSavingWithError:contextInfo:), nil); /** *  通过UIImageWriteToSavedPhotosAlbum函数写入图片完毕后就会调用这个方法 * *  @param image       写入的图片 *  @param error       错误信息 *  @param contextInfo UIImageWriteToSavedPhotosAlbum函数的最后一个参数 */  - (void)image:(UIImage *)image didFinishSavingWithError:(NSError *)error contextInfo:(void *)contextInfo {if (error) {    [SVProgressHUD showErrorWithStatus:@"图片保存失败!"];} else {    [SVProgressHUD showSuccessWithStatus:@"图片保存成功!"];}}

保存图片到自定义相册

 - (IBAction)save {/* PHAuthorizationStatusNotDetermined,     用户还没有做出选择 PHAuthorizationStatusDenied,            用户拒绝当前应用访问相册(用户当初点击了"不允许") PHAuthorizationStatusAuthorized         用户允许当前应用访问相册(用户当初点击了"好") PHAuthorizationStatusRestricted,        因为家长控制, 导致应用无法方法相册(跟用户的选择没有关系) */// 判断授权状态PHAuthorizationStatus status = [PHPhotoLibrary authorizationStatus];if (status == PHAuthorizationStatusRestricted) { // 因为家长控制, 导致应用无法方法相册(跟用户的选择没有关系)    [SVProgressHUD showErrorWithStatus:@"因为系统原因, 无法访问相册"];} else if (status == PHAuthorizationStatusDenied) { // 用户拒绝当前应用访问相册(用户当初点击了"不允许")    NSLog(@"提醒用户去[设置-隐私-照片-xxx]打开访问开关");} else if (status == PHAuthorizationStatusAuthorized) { // 用户允许当前应用访问相册(用户当初点击了"好")    [self saveImage];} else if (status == PHAuthorizationStatusNotDetermined) { // 用户还没有做出选择    // 弹框请求用户授权    [PHPhotoLibrary requestAuthorization:^(PHAuthorizationStatus status) {        if (status == PHAuthorizationStatusAuthorized) { // 用户点击了好            [self saveImage];        }    }];} } // 保存图片 - (void)saveImage{// PHAsset : 一个资源, 比如一张图片\一段视频// PHAssetCollection : 一个相簿// PHAsset的标识, 利用这个标识可以找到对应的PHAsset对象(图片对象)__block NSString *assetLocalIdentifier = nil;// 如果想对"相册"进行修改(增删改), 那么修改代码必须放在[PHPhotoLibrary sharedPhotoLibrary]的performChanges方法的block中[[PHPhotoLibrary sharedPhotoLibrary] performChanges:^{    // 1.保存图片A到"相机胶卷"中    // 创建图片的请求    assetLocalIdentifier = [PHAssetCreationRequest creationRequestForAssetFromImage:self.imageView.image].placeholderForCreatedAsset.localIdentifier;} completionHandler:^(BOOL success, NSError * _Nullable error) {    if (success == NO) {        [self showError:@"保存图片失败!"];        return;    }    // 2.获得相簿    PHAssetCollection *createdAssetCollection = [self createdAssetCollection];    if (createdAssetCollection == nil) {        [self showError:@"创建相簿失败!"];        return;    }    [[PHPhotoLibrary sharedPhotoLibrary] performChanges:^{        // 3.添加"相机胶卷"中的图片A到"相簿"D中        // 获得图片        PHAsset *asset = [PHAsset fetchAssetsWithLocalIdentifiers:@[assetLocalIdentifier] options:nil].lastObject;        // 添加图片到相簿中的请求        PHAssetCollectionChangeRequest *request = [PHAssetCollectionChangeRequest changeRequestForAssetCollection:createdAssetCollection];        // 添加图片到相簿        [request addAssets:@[asset]];    } completionHandler:^(BOOL success, NSError * _Nullable error) {        if (success == NO) {            [self showError:@"保存图片失败!"];;        } else {            [self showSuccess:@"保存图片成功!"];;        }    }];}];}/** *  获得相簿 */ - (PHAssetCollection *)createdAssetCollection{// 从已存在相簿中查找这个应用对应的相簿PHFetchResult<PHAssetCollection *> *assetCollections = [PHAssetCollection fetchAssetCollectionsWithType:PHAssetCollectionTypeAlbum subtype:PHAssetCollectionSubtypeAlbumRegular options:nil];for (PHAssetCollection *assetCollection in assetCollections) {    if ([assetCollection.localizedTitle isEqualToString:XMGAssetCollectionTitle]) {        return assetCollection;    }}// 没有找到对应的相簿, 得创建新的相簿// 错误信息NSError *error = nil;// PHAssetCollection的标识, 利用这个标识可以找到对应的PHAssetCollection对象(相簿对象)__block NSString *assetCollectionLocalIdentifier = nil;[[PHPhotoLibrary sharedPhotoLibrary] performChangesAndWait:^{    // 创建相簿的请求    assetCollectionLocalIdentifier = [PHAssetCollectionChangeRequest creationRequestForAssetCollectionWithTitle:XMGAssetCollectionTitle].placeholderForCreatedAssetCollection.localIdentifier;} error:&error];// 如果有错误信息if (error) return nil;// 获得刚才创建的相簿return [PHAssetCollection fetchAssetCollectionsWithLocalIdentifiers:@[assetCollectionLocalIdentifier] options:nil].lastObject;}- (void)showSuccess:(NSString *)text{dispatch_async(dispatch_get_main_queue(), ^{    [SVProgressHUD showSuccessWithStatus:text];});}- (void)showError:(NSString *)text{dispatch_async(dispatch_get_main_queue(), ^{    [SVProgressHUD showErrorWithStatus:text];});}

Xcode插件的安装路径

/Users/用户名/Library/Application Support/Developer/Shared/Xcode/Plug-ins