iOS - 相机功能权限判断和设置

调用系统相机功能之前事先对相机权限进行预判，若未开启则跳转至手机设置开启该功能，具体 code 如下：

/*
  AVAuthorizationStatusNotDetermined 没有对应用程序授权进行操作
  AVAuthorizationStatusRestricted    没有授权访问的照片数据
  AVAuthorizationStatusDenied        用户拒绝对应用程序授权
  AVAuthorizationStatusAuthorized    用户对应用程序授权
*/
NSString *mediaType = AVMediaTypeVideo; //读取媒体类型
AVAuthorizationStatus authStatus = [AVCaptureDevice authorizationStatusForMediaType:mediaType]; //读取设备授权状态
if (authStatus == AVAuthorizationStatusNotDetermined || authStatus == AVAuthorizationStatusRestricted || authStatus == AVAuthorizationStatusDenied) { // 授权受阻
    UIAlertController *alterCon = [UIAlertController alertControllerWithTitle:@"是否开启相机访问权限？"
                                                                      message:nil
                                                               preferredStyle:UIAlertControllerStyleAlert];
    UIAlertAction *OFF = [UIAlertAction actionWithTitle:@"取消" style:UIAlertActionStyleDefault handler:nil];
    UIAlertAction *ON = [UIAlertAction actionWithTitle:@"去开启" style:UIAlertActionStyleDestructive handler:^(UIAlertAction * _Nonnull action) { // 设置权限
        NSURL *url = [NSURL URLWithString:UIApplicationOpenSettingsURLString];
        if ([[UIApplication sharedApplication] canOpenURL:url]) {
            [[UIApplication sharedApplication] openURL:url options:@{} completionHandler:^(BOOL success) {
                // do something
            }];
        }
    }];
    [alterCon addAction:OFF];
    [alterCon addAction:ON];
    [controller presentViewController:alterCon animated:YES completion:nil];
} else { // 已开启
    // do something
}

以上便是此次分享的全部内容，希望能对大家有所帮助！