如果我不想創建實例並在viewDidLoad（）中設置委托但以某種方法正確定位委托，該如何正確定位？

Question

如果我不想在viewDidLoad（）中創建實例並在某種方法中設置委托，如何正確定位委托？ 一切正常，但收到警告。

// ViewController.m    
// Warning: Assigning to 'id'<UINavigationControllerDelegate,UIImagePickerControllerDelegate> from incomplatible type 'ViewController *const __strong

-(void)takeMedia:(UIButton *)sender
{  
  mypicker = [UIImagePickerController new];
  mypicker.delegate = self; // <<<----
  mypicker.sourceType = UIImagePickerControllerSourceTypeCamera;
  [self presentViewController:mypicker animated:YES completion:nil];
}

Answer 1

確保您在頭文件中都包含了兩個委托，例如

@interface MyViewController <UINavigationControllerDelegate,UIImagePickerControllerDelegate>