delegates - 在为 ABPeoplePickerNavigationController 设置委托时收到警告

Question

我正在尝试使用以下代码片段构建应用程序

我的接口定义是

@interface CreateMessageViewController : UIViewController

我调用按钮单击的方法是

-(IBAction) handleEvents:(id) sender
 {
    if ((UIButton *) sender == openContact)
    {
       ABPeoplePickerNavigationController *picker = [[ABPeoplePickerNavigationController alloc] init];
       picker.peoplePickerDelegate = self;
       [self presentModalViewController:picker animated:YES];
       [picker release];
    }}

现在我收到警告picker.peoplePickerDelegate = self;说

警告：类“CreateMessageViewController”未实现“ABPeoplePickerNavigationControllerDelegate”协议

我无法删除警告。请在这方面帮助我

任何形式的帮助将不胜感激

提前致谢！！

Answer 1

peoplePickerDelegate需要分配一些支持ABPeoplePickerNavigationControllerDelegate您的控制器类不支持的协议的东西（self 是您的控制器的一个实例，以防您不明显）。尝试

@interface CreateMessageViewController : UIViewController  <ABPeoplePickerNavigationControllerDelegate> {}

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