UIMenuController的使用

1. UIMenuController示例

示例.png

2. UIMenuController须知

• 默认情况下,以下3个控件已经支持UIMenuController
  • UITextView
  • UITextFiled
  • UIWebView

3. 让其他控件也支持UIMenuController(例:UILabel)

1. 自定义UILabel
2. 重写两个方法
   //让label有资格成为第一响应者
   - (BOOL)canBecomeFirstResponder {
   return YES;
   }
   /**
   * label能执行哪些操作(比如copy, paste)
   * @return YES:支持这种操作
   */
   - (BOOL)canPerformAction:(SEL)action withSender:(id)sender {
   if (action == @selector(cut:) || action == @selector(copy:) || action == @selector(paste:))
   return YES;
   return NO;
   }
3. 实现剪切,复制,粘贴方法
   //剪切
   - (void)cut:(UIMenuController *)menu {
   //将自己的文字复制到粘贴板
   [self copy:menu];
   //清空文字
   self.text = nil;
   }
   //复制
   - (void)copy:(UIMenuController *)menu {
   //将自己的文字复制到粘贴板
   UIPasteboard *board = [UIPasteboard generalPasteboard];
   board.string = self.text;
   }
   //粘贴
   - (void)paste:(UIMenuController *)menu {
   //将粘贴板的文字复制到自己身上
   UIPasteboard *board = [UIPasteboard generalPasteboard];
   self.text = board.string;
   }
4. 让label成为第一响应者
   //这里self是label
   [self becomeFirstResponder];
5. 显示UIMenuController
   UIMenuController *menu = [UIMenuController sharedMenuController];
   //targetRect: MenuController需要指向的矩形框
   //targetView: targetRect会以targetView的左上角为坐标原点
   [menu setTargetRect:self.bounds inView:self];
   [menu setMenuVisible:YES animated:YES];

4. 自定义UIMenuController内部的Item

//添加MenuItem(点击Item,默认会调用控制器的方法)
UIMenuItem *ding = [[UIMenuItem alloc] initWithTitle:@"顶" action:@selector(ding:)];
UIMenuItem *replay = [[UIMenuItem alloc] initWithTitle:@"回复" action:@selector(replay:)];
UIMenuItem *report = [[UIMenuItem alloc] initWithTitle:@"举报" action:@selector(report:)];
menu.menuItems = @[ding,replay,report];