ios - 使用Apple的代码时，控件可能会达到非空函数的结尾

我收到以下警告：


  控制可能会达到非无效功能的终点


使用来自developer.apple.com的一些代码时：

Apple's code for Taking Pictures and Movies

- (BOOL) startCameraControllerFromViewController: (UIViewController*) controller usingDelegate: (id <UIImagePickerControllerDelegate,UINavigationControllerDelegate>) delegate
{
    if (([UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypeCamera] == NO) || (delegate == nil) || (controller == nil)) return NO;

    UIImagePickerController *cameraUI = [[UIImagePickerController alloc] init];
        cameraUI.sourceType = UIImagePickerControllerSourceTypeCamera;

    cameraUI.mediaTypes = [UIImagePickerController availableMediaTypesForSourceType:
        UIImagePickerControllerSourceTypeCamera];

    cameraUI.allowsEditing = NO;

    cameraUI.delegate = delegate;
    [controller presentViewController:cameraUI animated:YES completion:nil];
}

谁能告诉我为什么？

最佳答案

您需要在函数中返回BOOL值才能摆脱警告
线后只需致电

 [controller presentViewController:cameraUI animated:YES completion:nil];
 return YES;

关于ios - 使用Apple的代码时，控件可能会达到非空函数的结尾，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/19021163/