1、简介

　　用于剪切、复制、粘贴、选择、选择ALL和DELETE命令的菜单界面。

　　UITextField、UIWebView、UITextView自带有这种UIMenuController效果；

2、相关API

#import
#import
#import

NS_ASSUME_NONNULL_BEGIN

typedef NS_ENUM(NSInteger, UIMenuControllerArrowDirection) {
UIMenuControllerArrowDefault, // up or down based on screen location
UIMenuControllerArrowUp NS_ENUM_AVAILABLE_IOS(3_2),
UIMenuControllerArrowDown NS_ENUM_AVAILABLE_IOS(3_2),
UIMenuControllerArrowLeft NS_ENUM_AVAILABLE_IOS(3_2),
UIMenuControllerArrowRight NS_ENUM_AVAILABLE_IOS(3_2),
} __TVOS_PROHIBITED;

@class UIView, UIMenuItem;

NS_CLASS_AVAILABLE_IOS(3_0) __TVOS_PROHIBITED @interface UIMenuController : NSObject

//初始化懒加载
#if UIKIT_DEFINE_AS_PROPERTIES
@property(class, nonatomic, readonly) UIMenuController *sharedMenuController;
#else

• (UIMenuController *)sharedMenuController;
  #endif

//菜单的显示和隐藏
@property(nonatomic,getter=isMenuVisible) BOOL menuVisible; // default is NO

• (void)setMenuVisible:(BOOL)menuVisible animated:(BOOL)animated; //可动画

//设置显示区域

• (void)setTargetRect:(CGRect)targetRect inView:(UIView *)targetView;
  //编辑菜单箭头指向的方向。
  @property(nonatomic) UIMenuControllerArrowDirection arrowDirection NS_AVAILABLE_IOS(3_2); // default is UIMenuControllerArrowDefault

@property(nullable, nonatomic,copy) NSArray *menuItems NS_AVAILABLE_IOS(3_2); // default is nil. 编辑菜单中的自定义菜单项。
//刷新Menu

• (void)update;
  //返回编辑菜单的框架
  @property(nonatomic,readonly) CGRect menuFrame;

@end

UIKIT_EXTERN NSNotificationName const UIMenuControllerWillShowMenuNotification __TVOS_PROHIBITED; //将要显示
UIKIT_EXTERN NSNotificationName const UIMenuControllerDidShowMenuNotification __TVOS_PROHIBITED; //已经显示
UIKIT_EXTERN NSNotificationName const UIMenuControllerWillHideMenuNotification __TVOS_PROHIBITED; //将要隐藏
UIKIT_EXTERN NSNotificationName const UIMenuControllerDidHideMenuNotification __TVOS_PROHIBITED; //已经隐藏
UIKIT_EXTERN NSNotificationName const UIMenuControllerMenuFrameDidChangeNotification __TVOS_PROHIBITED; //视图更新

//自定义菜单项
NS_CLASS_AVAILABLE_IOS(3_2) __TVOS_PROHIBITED @interface UIMenuItem : NSObject
//标题 和 响应方法

• (instancetype)initWithTitle:(NSString *)title action:(SEL)action NS_DESIGNATED_INITIALIZER;
  @property(nonatomic,copy) NSString *title;
  @property(nonatomic) SEL action;

@end

3、自定义MenuLabel

#import "MenuLabel.h"

@implementation MenuLabel

• (instancetype)initWithFrame:(CGRect)frame{
  if (self = [super initWithFrame:frame]) {
  [self setUI];
  }
  return self;
  }

• (void)awakeFromNib{
  [super awakeFromNib];
  [self setUI];
  }

• (void)setUI{
  self.userInteractionEnabled = YES;
  // self.text = @"";
  [self addGestureRecognizer:[[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(tapGes:)]];
  }

• (void)tapGes:(UITapGestureRecognizer *)ges{
  [self becomeFirstResponder];
  UIMenuController *menu = [UIMenuController sharedMenuController];
  menu.menuItems = @[[[UIMenuItem alloc] initWithTitle:@"点赞" action:@selector(tap:)],
  [[UIMenuItem alloc] initWithTitle:@"留言" action:@selector(reply:)],
  [[UIMenuItem alloc] initWithTitle:@"踩一踩" action:@selector(down:)],
  [[UIMenuItem alloc] initWithTitle:@"踩一踩" action:@selector(down:)]];
  [menu setTargetRect:self.bounds inView:self];
  [menu setMenuVisible:YES animated:YES];
  }

• (BOOL)canBecomeFirstResponder{
  return YES;
  }

• (BOOL)canPerformAction:(SEL)action withSender:(id)sender{
  if ( (action == @selector(copy:) && self.text) // 需要有文字才能支持复制
  || (action == @selector(cut:) && self.text) // 需要有文字才能支持剪切
  || action == @selector(paste:)
  || action == @selector(tap:)
  || action == @selector(reply:)
  || action == @selector(down:)) return YES;
  return NO;
  }

• (void)cut:(UIMenuController *)menu
  {
  //UIPasteboard 粘贴板
  // 将label的文字存储到粘贴板
  [UIPasteboard generalPasteboard].string = self.text;
  // 清空文字
  self.text = nil;
  NSLog(@"cut");
  }

• (void)copy:(UIMenuController *)menu
  {
  // 将label的文字存储到粘贴板
  [UIPasteboard generalPasteboard].string = self.text;
  NSLog(@"copy");
  }

• (void)paste:(UIMenuController *)menu
  {
  // 将粘贴板的文字赋值给label
  self.text = [UIPasteboard generalPasteboard].string;
  NSLog(@"paste");
  }

• (void)tap:(UIMenuController *)menu{
  NSLog(@"tap");
  }

• (void)reply:(UIMenuController *)menu{
  NSLog(@"reply");
  }

• (void)down:(UIMenuController *)menu{
  NSLog(@"down");
  }

@end

MenuLabel.m文件

　　ps：自定义UIMenuItem过多是自动分页；

　　　　部分选择文本可以继承TextView自定义类；

　　　　注意事项：自身可交互、成为第一响应者、显示前设置好位置等属性；

self.userInteractionEnabled = YES;  
\[self becomeFirstResponder\];

　　　　实现UIResponder类中的一个方法：

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