iOS 14 相册适配PHAuthorizationStatusNotDetermined

1.

#import <PhotosUI/PhotosUI.h>

 

Info.plist 中设置
“PHPhotoLibraryPreventAutomaticLimitedAccessAlert”的值为 YES 来阻止该弹窗反复弹出

 2.iOS14之后获取相册授权状态的方法

    if (@available(iOS 14, *)) {
        [PHPhotoLibrary requestAuthorizationForAccessLevel:PHAccessLevelReadWrite handler:^(PHAuthorizationStatus status) {
            dispatch_async(dispatch_get_main_queue(), ^{
                ///用户已授权此应用程序有限的照片库访问权限
                if (status == PHAuthorizationStatusLimited) {
                   
                }else{
                    
                }
            });
        }];
    }

　　

3.第一种使用方法，和QQ一样，推荐使用

不在 Info.plist 阻止弹窗弹出， 使用监听获取回调

1. 实现PHPhotoLibraryChangeObserver

@interface AddWatermarkViewController ()<PHPhotoLibraryChangeObserver>

2. 注册监听
- (void)viewDidLoad {
    [super viewDidLoad];
    [[PHPhotoLibrary sharedPhotoLibrary] registerChangeObserver:self];
}

/// PHPhotoLibrary监听: 选择图片之后的回调

#pragma mark-   PHPhotoLibraryChangeObserver

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

    ///一定要在主线程刷新：这里是异步监听

    dispatch_async (dispatch_get_main_queue (), ^{

        [self reloadSelectedAssetCollection:nil];

    });

}

4. 注销监听
- (void)viewWillDisappear:(BOOL)animated{
    [super viewWillDisappear:animated];
    [[PHPhotoLibrary sharedPhotoLibrary] unregisterChangeObserver:self];
}

　　

2.自定义控制器，此方法选了之后去 设置中查看， 还是没效果。。 原因待查

1. 设置代理 PHPickerViewControllerDelegate
@interface AddWatermarkViewController ()< PHPickerViewControllerDelegate>


2.手动显示弹窗
- (void)showAlert{
    @WeakObj(self);
    if (@available(iOS 14, *)) {
　　　　///14之后想着授权状态方法：异步的
        [PHPhotoLibrary requestAuthorizationForAccessLevel:PHAccessLevelReadWrite handler:^(PHAuthorizationStatus status) {
            dispatch_async(dispatch_get_main_queue(), ^{
                @StrongObj(self);
                if (status == PHAuthorizationStatusLimited) {
                    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 imagesFilter 表示 只显示图片
                    configuration.selectionLimit = 0; // 默认为1，为0时表示可多选。
                    
                    PHPickerViewController *picker = [[PHPickerViewController alloc] initWithConfiguration:configuration];
                    picker.delegate = self;
                    [self presentViewController:picker animated:YES completion:nil];
                }
            });
        }];
    }
}

//点击取消或者完成的回调
- (void)picker:(PHPickerViewController *)picker didFinishPicking:(NSArray<PHPickerResult *> *)results
API_AVAILABLE(ios(14)){
    [picker dismissViewControllerAnimated:YES completion:nil];
    if (!results || !results.count) {
        return;
    }
    [self reloadSelectedAssetCollection:self.selectedAssetCollection];
    NSLog(@"didFinishPicking");
}

　　

参考：

iOS14 适配 先行者

https://www.jianshu.com/p/a0b0303962bb

iOS14 隐私适配及部分解决方案

https://www.jianshu.com/p/1803bd950b90?devtype=android