获取相册权限

iOS14相册整理包含 plist设置，iOS相册权限查询和调取处理（兼容iOS14使用PHPickerViewController），以及PHAuthorizationStatusLimited权限处理。

plist 设置

//    NSPhotoLibraryAddUsageDescription 用户存入相册时的提示信息。
//    NSPhotoLibraryUsageDescription  相册访问权限信息，必须有此项，不然访问相册的时候 APP 会 Crash。
//    PHPhotoLibraryPreventAutomaticLimited 如果未适配，App在每次冷启动时都会触发询问用户是否需要修改照片权限，添加可供App访问的图片。

iOS14 权限查询

    if (@available(iOS 14, *)) {
        PHAccessLevel level = PHAccessLevelReadWrite;
        PHAuthorizationStatus status = [PHPhotoLibrary authorizationStatusForAccessLevel:level];
          switch (status) {
              case PHAuthorizationStatusLimited:
                  NSLog(@"limited");
                  //权限处理逻辑看下方  
                  //这里可以直接调取从新选择图片，也可以直接调取 [self limtShow];
                  //建议每次启动后做一次选择图片处理 在调用[self limtShow]展示
                  break;
              case PHAuthorizationStatusDenied:{
                  NSLog(@"denied");
                  UIAlertView *alertView = [[UIAlertView alloc] initWithTitle:@"相机权限申请" message:@"没有权限访问您的相机，您可以进入系统“设置>隐私>相机”，允许访问您的相机" delegate:nil cancelButtonTitle:@"知道了" otherButtonTitles:nil];
                  [alertView show];
                  }
                  break;
              case PHAuthorizationStatusAuthorized:
                  NSLog(@"authorized");
                  [self takeimagePhoto];
                  break;
              case PHAuthorizationStatusNotDetermined:
                  NSLog(@"denied");
                  [self requestAuthorization];
                  break;

              default:
                  break;
        }
    } else {
        //判断相册权限
        PHAuthorizationStatus photoAuthorStatus = [PHPhotoLibrary authorizationStatus];
        if (photoAuthorStatus ==PHAuthorizationStatusAuthorized ) {

            [self takeimagePhoto];

        }else{
            [self requestAuthorization];
        }
    }

请求权限

-(void)requestAuthorization{
    if (@available(iOS 14, *)) {
        PHAccessLevel level = PHAccessLevelReadWrite;
        // 请求权限，需注意 limited 权限尽在 accessLevel 为 readAndWrite 时生效
        [PHPhotoLibrary requestAuthorizationForAccessLevel:level handler:^(PHAuthorizationStatus status) {
            switch (status) {
                case PHAuthorizationStatusLimited:
                    NSLog(@"limited");
//                    [self takeimagePhoto];
                    [self limtShow];
//                    dispatch_async(dispatch_get_main_queue(), ^{
//
//                        [[PHPhotoLibrary sharedPhotoLibrary] presentLimitedLibraryPickerFromViewController:[AppUtily currentViewController]];
//                    });
                    break;
                case PHAuthorizationStatusDenied:
                    NSLog(@"denied");
                    [self performSelectorOnMainThread:@selector(doAlert) withObject:nil waitUntilDone:YES];
                    break;
                case PHAuthorizationStatusAuthorized:
                    NSLog(@"authorized");
                    [self takeimagePhoto];
                    break;
                default:
                    break;
            }
        }];
    } else {
        //获取相册访问权限 ios8之后推荐用这种方法 //该方法提示用户授权对相册的访问
        [PHPhotoLibrary requestAuthorization:^(PHAuthorizationStatus status) {

            if (status == PHAuthorizationStatusDenied) {

                NSLog(@"用户拒绝当前应用访问相册,我们需要提醒用户打开访问开关");

                [self performSelectorOnMainThread:@selector(doAlert) withObject:nil waitUntilDone:YES];

            }else if (status == PHAuthorizationStatusAuthorized){
                //有权限 可直接跳转
                [self takeimagePhoto];

            }
        }];
    }
}

调取相册

-(void)takeimagePhoto{
    dispatch_async(dispatch_get_main_queue(), ^{
        if (@available(iOS 14.0, *)) {
            PHPickerConfiguration *configuration = [[PHPickerConfiguration alloc] init];
            configuration.filter = [PHPickerFilter imagesFilter]; // 可配置查询用户相册中文件的类型，支持三种
            configuration.selectionLimit = 1; // 默认为1，为0时表示可多选。

            PHPickerViewController *picker = [[PHPickerViewController alloc] initWithConfiguration:configuration];
            picker.delegate = self;
            //        picker.editing = YES;//allowsEditing
            picker.modalPresentationStyle = UIModalPresentationFullScreen;
            picker.view.backgroundColor = [UIColor whiteColor];//注意需要进行暗黑模式适配
            _picker = picker;
            // picker vc，在选完图片后需要在回调中手动 dismiss

            //  [AppUtily currentViewController] 替换成self
            [[AppUtily currentViewController] presentViewController:_picker animated:YES completion:^{
            }];
//
//
        } else {
            UIImagePickerController* ipc = [[UIImagePickerController alloc] init];
            ipc.navigationBar.translucent = NO;
            if([UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypePhotoLibrary]) {
                
                NSString *requiredMediaType = ( NSString *)kUTTypeImage;
                NSArray *arrMediaTypes=[NSArray arrayWithObjects:requiredMediaType,nil];
                [ipc setMediaTypes:arrMediaTypes];
                ipc.sourceType = UIImagePickerControllerSourceTypePhotoLibrary;
                //pickerImage.sourceType = UIImagePickerControllerSourceTypeSavedPhotosAlbum;
                //ipc.mediaTypes = [UIImagePickerController availableMediaTypesForSourceType:ipc.sourceType];
            }
            
            //        usePhotoImg = YES;
            ipc.delegate = self;
            ipc.allowsEditing = YES;
            ipc.modalPresentationStyle = UIModalPresentationFullScreen;
            if (@available(iOS 11, *)) {
                UIScrollView.appearance.contentInsetAdjustmentBehavior = UIScrollViewContentInsetAdjustmentAutomatic;
            }
            
            //  [AppUtily currentViewController] 替换成self
            [[AppUtily currentViewController] presentViewController:ipc animated:YES completion:nil];
            
            
        }
    });
}

相册完成回调

- (void)picker:(PHPickerViewController *)picker didFinishPicking:(NSArray<PHPickerResult *> *)results API_AVAILABLE(ios(14));{
    
   //结果为空直接返回
    if (!results || !results.count) {
        [picker dismissViewControllerAnimated:YES completion:nil];
        return;
    }

    NSItemProvider *itemProvider = results.firstObject.itemProvider;
    if ([itemProvider canLoadObjectOfClass:UIImage.class]) {
        __weak typeof(self) weakSelf = self;
        [itemProvider loadObjectOfClass:UIImage.class completionHandler:^(__kindof id<NSItemProviderReading>  _Nullable object, NSError * _Nullable error) {
            if ([object isKindOfClass:UIImage.class]) {

                __strong typeof(self) strongSelf = weakSelf;
                dispatch_async(dispatch_get_main_queue(), ^{
                    UIImage *image = (UIImage *)object;
                  //处理获取的image
                    if ([strongSelf.delegate respondsToSelector:@selector(TZAlreadyLoginViewDelegateWithActionEnum:withdata:)]) {
                        [strongSelf.delegate TZAlreadyLoginViewDelegateWithActionEnum:ActionEnumChangeTitleImage withdata:image];

                    }

                    [picker dismissViewControllerAnimated:YES completion:nil];

                });
            }
        }];
    }
 }

iOS14以下UIImagePickerController

#pragma mark UIImagePickerControllerDelegate

- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info{
    
    UIImage *image = [info objectForKey:UIImagePickerControllerEditedImage];
 //处理获取的image
    if ([self.delegate respondsToSelector:@selector(TZAlreadyLoginViewDelegateWithActionEnum:withdata:)]) {
        [self.delegate TZAlreadyLoginViewDelegateWithActionEnum:ActionEnumChangeTitleImage withdata:image];
        NSLog(@"tzdelegate---imagePickerController");
    }

    [picker dismissViewControllerAnimated:YES completion:nil];

}

- (void)navigationController:(UINavigationController *)navigationController didShowViewController:(UIViewController *)viewController animated:(BOOL)animated
{
    if ([UIDevice currentDevice].systemVersion.floatValue < 11) {
        return;
    }
    if ([viewController isKindOfClass:NSClassFromString(@"PUPhotoPickerHostViewController")]) {
        [viewController.view.subviews enumerateObjectsUsingBlock:^(__kindof UIView * _Nonnull obj, NSUInteger idx, BOOL * _Nonnull stop) {
            if (obj.frame.size.width < 42) {
                [viewController.view sendSubviewToBack:obj];
                *stop = YES;
            }
        }];
    }
}

-(void)imagePickerController:(UIImagePickerController *)picker didFinishPickingImage:(UIImage *)image editingInfo:(NSDictionary *)editingInfo{
    
}
- (void)imagePickerControllerDidCancel:(UIImagePickerController *)picker{
    
    [picker dismissViewControllerAnimated:YES completion:nil];
    if (@available(iOS 11, *)) {
        UIScrollView.appearance.contentInsetAdjustmentBehavior = UIScrollViewContentInsetAdjustmentNever;
    }
}

iOS14 PHAuthorizationStatusLimited 权限处理

-(void)limtShow{
    PHFetchOptions *option = [[PHFetchOptions alloc] init];
    //                  //ascending 为YES时，按照照片的创建时间升序排列;为NO时，则降序排列
    option.sortDescriptors = @[[NSSortDescriptor sortDescriptorWithKey:@"creationDate" ascending:NO]];
    self.fetchList = [PHAsset fetchAssetsWithMediaType:PHAssetMediaTypeImage options:option];//PHFetchResult这个类型可以当成NSArray使用。此时所有可获取照片都已拿到，可以刷新UI进行显示

    NSMutableArray<PHAsset *> *assets = [NSMutableArray array];    
    [self.fetchList enumerateObjectsUsingBlock:^(id  _Nonnull obj, NSUInteger idx, BOOL * _Nonnull stop) {
        
        PHAsset *asset = (PHAsset *)obj;
        
        NSLog(@"照片名%@", [asset valueForKey:@"filename"]);
        
        [assets addObject:asset];
        
    }];
    NSString * numStr = [NSString stringWithFormat:@"全部图片(%ld)",assets.count];
    self.array_collect = [NSMutableArray array];
    NSLog(@"%@",numStr);
    for (PHAsset *set in assets) {
        
        PHImageRequestOptions *options = [[PHImageRequestOptions alloc] init];
        
        options.deliveryMode = PHImageRequestOptionsDeliveryModeHighQualityFormat;
        
        
        
        [[PHImageManager defaultManager] requestImageForAsset:set targetSize:[UIScreen mainScreen].bounds.size contentMode:PHImageContentModeAspectFit options:options resultHandler:^(UIImage *result, NSDictionary *info) {
            
            //设置处理图片 
            
            [self.array_collect addObject:result];
            
            [self.collection reloadData];
            
        }];
      
        NSLog(@"%lu",(unsigned long)_array_collect.count);
    }
}

主动弹出选择照片PHPickerViewController

[[PHPhotoLibrary sharedPhotoLibrary] presentLimitedLibraryPickerFromViewController:self];

相册limt 选择照片后发生改变

加入协议  PHPhotoLibraryChangeObserver //<PHPhotoLibraryChangeObserver>

//在初始化时加入
[[PHPhotoLibrary sharedPhotoLibrary] registerChangeObserver:self];

//结束时加入
- (void)dealloc {
    [[PHPhotoLibrary sharedPhotoLibrary] unregisterChangeObserver:self];
    // NSLog(@"%@ dealloc",NSStringFromClass(self.class));
}


- (void)photoLibraryDidChange:(PHChange *)changeInstance;{

    [self limtShow];
    
}