UIMenucontroller的使用

1. Menu所处的View必须实现 – (BOOL)canBecomeFirstResponder, 且返回YES
2. Menu所处的View必须实现 – (BOOL)canPerformAction:withSender,并根据需求返回YES或NO
3. 使Menu所处的View成为First Responder (becomeFirstResponder)
4. 定位Menu (- setTargetRect:inView:)
5. 展示Menu (- setMenuVisible:animated:)

UIMenuController*popMenu = [UIMenuControllersharedMenuController];

  

UIMenuItem *item1 = [[UIMenuItem alloc] initWithTitle:@”1″ action:@selector(menuItem1Pressed:)];

UIMenuItem *item2 = [[UIMenuItem alloc] initWithTitle:@”2″ action:@selector(menuItem2Pressed:)];

UIMenuItem *item3 = [[UIMenuItem alloc] initWithTitle:@”3″ action:@selector(menuItem3Pressed:)];

UIMenuItem *item4 = [[UIMenuItem alloc] initWithTitle:@”4″ action:@selector(menuItem4Pressed:)];

NSArray *menuItems = [NSArray arrayWithObjects:item1,item2,item3,item4,nil];

[popMenu setMenuItems:menuItems];

[popMenu setArrowDirection:UIMenuControllerArrowDown];

  

[item4 release];

[item3 release];

[item2 release];

[item1 release];

[popMenu setTargetRect:CGRectMake(162,195,0,0)inView:self.dialView];

[popMenu setMenuVisible:YES animated:YES];

1. becomFirstResponder方法，使view或者viewController的self成为第一响应者，可以在相应文件的任意地方调用实现该方法，不过建议与UIMenuController放在一起。

   [selfbecomeFirstResponder];

2. 设置-(BOOL) canBecomeFirstResponder的返回值为YES，原因不言而喻。

   -(BOOL) canBecomeFirstResponder{

   returnYES;

   }

3. 重载函数-(BOOL) canPerfomAction:(SEL)actionwithSender:(id)sender，设置要显示的菜单项，返回值为YES。若不进行任何限制，则将显示系统自带的所有菜单项（很多的，自己可以试一下)，在此，只显示自定义的4项，即：

   -(BOOL) canPerformAction:(SEL)action withSender:(id)sender{

   if (action == @selector(menuItem1Pressed:) || action ==@selector(menuItem2Pressed:)||

   action == @selector(menuItem3Pressed:) || action ==@selector(menuItem4Pressed:)){

   return YES;

   }

   return NO;//隐藏系统默认的菜单项

   }