ios 请求json ios 请求相机权限

- (void) checkVideoStatus {
    NSString *mediaType = AVMediaTypeVideo;//读取媒体类型
    AVAuthorizationStatus authStatus = [AVCaptureDevice authorizationStatusForMediaType:mediaType];//读取设备授权状态
    if(authStatus == AVAuthorizationStatusRestricted || authStatus == AVAuthorizationStatusDenied){
        NSString *errorStr = @"应用相机权限受限,请在iPhone的“设置-隐私-相机”选项中，允许访问你的相机。";
        UIAlertController *alert = [UIAlertController alertControllerWithTitle:nil message:errorStr preferredStyle:UIAlertControllerStyleAlert];
        UIAlertAction *cancel = [UIAlertAction actionWithTitle:@"取消" style:UIAlertActionStyleCancel handler:^(UIAlertAction * _Nonnull action) {
            
        }];
        UIAlertAction *setting = [UIAlertAction actionWithTitle:@"设置" style:UIAlertActionStyleDestructive handler:^(UIAlertAction * _Nonnull action) {
            NSURL *url = [NSURL URLWithString:UIApplicationOpenSettingsURLString];
            if (@available(iOS 10.0, *)) {
                [[UIApplication sharedApplication] openURL:url options:@{} completionHandler:^(BOOL success) {}];
            } else {
                [[UIApplication sharedApplication] openURL:url];
            }
        }];
        [alert addAction:cancel];
        [alert addAction:setting];
        [self.navigationController presentViewController:alert animated:YES completion:NULL];
        return;
    }
}