简介

Displaying and Managing the Edit Menu 官方文档

管理选择和编辑菜单

• 触发显示编辑菜单，注意需要能成为第一响应者才行，看情况是否需要继承处理。

- (void)tapHandler {
    if (![self becomeFirstResponder]) {
        NSLog(@"error");
        return;
    }
    
    UIMenuController *menu=[UIMenuController sharedMenuController];
    [menu setTargetRect:self.bounds inView:self];
    [menu setMenuVisible:YES];
}

• 选择性显示

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

添加自定义项目

• 一般是UIResponder类的子类即可，比如继承UIImage，注意需要使用点击或者其他方式触发

- (instancetype)initWithFrame:(CGRect)frame {
    self = [super initWithFrame:frame];
    if (self) {        
        self.userInteractionEnabled = YES;
       
        UITapGestureRecognizer *pressGesture=[[UITapGestureRecognizer alloc]initWithTarget:self action:@selector(tapHandler)];
        [self addGestureRecognizer:pressGesture];
        
    }
    return self;
}

• 必须第一响应者才会触发编辑菜单

- (BOOL)canBecomeFirstResponder {
    return YES;
}

• 触发显示编辑菜单

- (void)tapHandler {
    if (![self becomeFirstResponder]) {
        NSLog(@"error");
        return;
    }
    
    UIMenuController *menu=[UIMenuController sharedMenuController];
    
    // 自定义的菜单，注意seletor需要选择在后面显示
    UIMenuItem *pop = [[UIMenuItem alloc]initWithTitle:@"Pop" action:@selector(popSelf)];
    
    menu.menuItems=@[pop];
    [menu setTargetRect:self.bounds inView:self];
    menu.arrowDirection=UIMenuControllerArrowDown;
    [menu update];
    [menu setMenuVisible:YES];
}

• 选择菜单按钮显示

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

• 自定义的菜单方法

- (void)popSelf {
    NSLog(@"pop");
}

隐藏编辑菜单

• 默认自动隐藏。
• 关于编辑菜单，还有额外的通知可供使用。

我整理的文档