iOS中长按调出菜单组件UIMenuController的使用实例

//是否可以成为第一相应
-(BOOL)canBecomeFirstResponder{
  return YES;
}
//是否可以接收某些菜单的某些交互操作
-(BOOL)canPerformAction:(SEL)action withSender:(id)sender{
    return YES;
}

  [self becomeFirstResponder];
  //设置菜单显示的位置 frame设置其文职 inView设置其所在的视图
  [[UIMenuController sharedMenuController] setTargetRect:frame inView:self.view];
  //将菜单控件设置为可见
  [UIMenuController sharedMenuController].menuVisible = YES;

-(BOOL)canPerformAction:(SEL)action withSender:(id)sender{
  if (action == @selector(cut:)||action == @selector(copy:)) {
    return YES;
  }
  return NO;
}

//剪切按钮的方法
- (void)cut:(nullable id)sender NS_AVAILABLE_IOS(3_0);
//复制按钮的方法
- (void)copy:(nullable id)sender NS_AVAILABLE_IOS(3_0);
//粘贴按钮的方法
- (void)paste:(nullable id)sender NS_AVAILABLE_IOS(3_0);
//选择按钮的方法
- (void)select:(nullable id)sender NS_AVAILABLE_IOS(3_0);
//全选按钮的方法
- (void)selectAll:(nullable id)sender NS_AVAILABLE_IOS(3_0);
//删除按钮的方法
- (void)delete:(nullable id)sender NS_AVAILABLE_IOS(3_2);
//改变书写模式为从左向右按钮触发的方法
- (void)makeTextWritingDirectionLeftToRight:(nullable id)sender NS_AVAILABLE_IOS(5_0);
//改变书写模式为从右向左按钮触发的方法
- (void)makeTextWritingDirectionRightToLeft:(nullable id)sender NS_AVAILABLE_IOS(5_0);

//替换按钮
- (void)_promptForReplace:(id)arg1{
  NSLog(@"promptForReplace");
}
//简体繁体转换按钮
-(void)_transliterateChinese:(id)sender{
  NSLog(@"transliterateChinese");
}
//文字风格按钮
-(void)_showTextStyleOptions:(id)sender{
  NSLog(@"showTextStyleOptions");
}
//定义按钮
-(void)_define:(id)sender{
  NSLog(@"define");
}
-(void)_addShortcut:(id)sender{
  NSLog(@"addShortcut");
}
-(void)_accessibilitySpeak:(id)sender{
  NSLog(@"accessibilitySpeak");
}
//语言选择按钮
-(void)_accessibilitySpeakLanguageSelection:(id)sender{
  NSLog(@"accessibilitySpeakLanguageSelection");
}
//暂停发音按钮
-(void)_accessibilityPauseSpeaking:(id)sender{
  NSLog(@"accessibilityPauseSpeaking");
}
//分享按钮
-(void)_share:(id)sender{
  NSLog(@"share");
}

[self becomeFirstResponder];
  UIMenuItem * item = [[UIMenuItem alloc]initWithTitle:@"自定义" action:@selector(newFunc)];
  [[UIMenuController sharedMenuController] setTargetRect:[sender frame] inView:self.view];
  [UIMenuController sharedMenuController].menuItems = @[item];
  [UIMenuController sharedMenuController].menuVisible = YES;
-(BOOL)canBecomeFirstResponder{
  return YES;
}
-(BOOL)canPerformAction:(SEL)action withSender:(id)sender{
  if (action == @selector(newFunc)) {
    return YES;
  }
  return NO;
}
-(void)newFunc{
  NSLog(@"自定义方法");
}

//显示的位置
@property(nonatomic) UIMenuControllerArrowDirection arrowDirection;
//枚举如下：
/*
typedef NS_ENUM(NSInteger, UIMenuControllerArrowDirection) {
  //默认 基于当前屏幕状态
  UIMenuControllerArrowDefault, // up or down based on screen location
  //箭头在上的显示模式
  UIMenuControllerArrowUp NS_ENUM_AVAILABLE_IOS(3_2),
  //箭头在下的显示模式
  UIMenuControllerArrowDown NS_ENUM_AVAILABLE_IOS(3_2),
  //箭头在左的显示模式
  UIMenuControllerArrowLeft NS_ENUM_AVAILABLE_IOS(3_2),
  //箭头在右的显示模式
  UIMenuControllerArrowRight NS_ENUM_AVAILABLE_IOS(3_2),
};
*/

注意点总结
要正常显示菜单，必须做到以下几点：
1. -(BOOL)canBecomeFirstResponder 必须返回YES

2. -(BOOL)canPerformAction:(SEL)action withSender:(id)sender
该函数中，要显示的菜单项（包括系统的菜单项）的方法必须返回YES

3. 在显示菜单前，必须调用：

[self becomeFirstResponder] 

成为第一个响应者

4. 为了马上可以正常显示第二个菜单，必须使用：

  [menuController setMenuVisible:NO];

先关闭一下，不然就显示不出来！