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关于UIMenuController
UIMenuController单例是由系统管理触碰隐藏逻辑的控件，特别在UITableView中cell需要这样的弹窗效果，显示隐藏等逻辑操作，为开发者省去很多时间。
使用直接上代码：
//
// ViewController.m
// UIMenuControllerDemo
//
// Created by Grabin on 2017/11/25.
// Copyright © 2017年 GrabinWong. All rights reserved.
//
#import "ViewController.h"
@interface ViewController ()
@property (nonatomic, strong) UIButton *abtn;
@end
@implementation ViewController
- (void)viewDidLoad {
[super viewDidLoad];
[self setUpUI];
}
- (void)setUpUI
{
_abtn = [[UIButton alloc] initWithFrame:CGRectMake(55.0, 80.0, 220.0, 40.0)];
[_abtn setTitle:@"这是个按钮" forState:UIControlStateNormal];
[_abtn setBackgroundColor:[UIColor orangeColor]];
[_abtn addTarget:self action:@selector(clickBtnAction:) forControlEvents:UIControlEventTouchUpInside];
[self.view addSubview:_abtn];
}
- (void)clickBtnAction:(UIButton *)abtn
{
UIMenuController *menuController = [UIMenuController sharedMenuController];
if (menuController.isMenuVisible) {
[menuController setMenuVisible:NO animated:YES];
} else {
[self becomeFirstResponder]; //此代码比较重要，当自定义view的时候，会导致item出不来
UIMenuItem *item0 = [[UIMenuItem alloc]initWithTitle:@"复制" action:@selector(copyAction)];
UIMenuItem *item1 = [[UIMenuItem alloc]initWithTitle:@"删除" action:@selector(deletedAction)];
menuController.menuItems = @[item0,item1];
menuController.arrowDirection = UIMenuControllerArrowUp;
[menuController setTargetRect:abtn.frame inView:self.view];
[menuController setMenuVisible:YES animated:YES];
}
}
// 是否能成为第一响应者
- (BOOL)canBecomeFirstResponder
{
return YES;
}
// 用于UIMenuController显示，缺一不可
-(BOOL)canPerformAction:(SEL)action withSender:(id)sender{
if (action == @selector(copyAction)
|| action ==@selector(deletedAction)){
return YES;
}
return NO;//隐藏系统默认的菜单项
}
- (void)copyAction
{
NSLog(@"%s 第%d行",__FUNCTION__,__LINE__);
}
- (void)deletedAction
{
NSLog(@"%s 第%d行",__FUNCTION__,__LINE__);
}
- (void)didReceiveMemoryWarning {
[super didReceiveMemoryWarning];
}
@end
注意的点在于
一、是否能成为第一响应者
// 是否能成为第一响应者
- (BOOL)canBecomeFirstResponder
{
return YES;
}
二、隐藏系统默认的菜单项 & 显示自定义菜单
// 用于UIMenuController显示，缺一不可
-(BOOL)canPerformAction:(SEL)action withSender:(id)sender{
if (action == @selector(copyAction)
|| action ==@selector(deletedAction)){
return YES;
}
return NO;//隐藏系统默认的菜单项
}
三、成为第一响应者
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