IOS - 相机和相册访问权限判断

代码如下：

    // 相册权限
    ALAuthorizationStatus author = [ALAssetsLibrary authorizationStatus];
    if (author == ALAuthorizationStatusRestricted || author == ALAuthorizationStatusDenied) {
        NSLog(@"请在手机的设置-隐私-照片中，允许xxx访问");
        return;
    }
    
    // 相机权限
    AVAuthorizationStatus authStatus = [AVCaptureDevice authorizationStatusForMediaType:AVMediaTypeVideo];
    if(authStatus == AVAuthorizationStatusRestricted || authStatus == AVAuthorizationStatusDenied){
        NSLog(@"请在手机的设置-隐私-相机中，允许xxx访问");
        return;
    }
    
    // 直接跳转app对应的设置中
    NSURL*url=[NSURL URLWithString:UIApplicationOpenSettingsURLString];
    [[UIApplication sharedApplication] openURL:url];

    //保存本地相册
    ALAssetsLibrary *library = [[ALAssetsLibrary alloc] init];
    [library writeImageToSavedPhotosAlbum:image.CGImage metadata:nil completionBlock:^(NSURL *assetURL, NSError *error) {
        if (!error) {
        }
     }];

对应的枚举列表：

typedef NS_ENUM(NSInteger, ALAuthorizationStatus) {
    ALAuthorizationStatusNotDetermined  = 0, // 用户尚未做出选择这个应用程序的问候
    ALAuthorizationStatusRestricted ,        // 此应用程序没有被授权访问的照片数据。可能是家长控制权限
    ALAuthorizationStatusDenied ,            // 用户已经明确否认了这一照片数据的应用程序访问
    ALAuthorizationStatusAuthorized          // 用户已经授权应用访问照片数据
}