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關(guān)于UIMenuController

UIMenuController單例是由系統(tǒng)管理觸碰隱藏邏輯的控件，特別在UITableView中cell需要這樣的彈窗效果，顯示隱藏等邏輯操作，為開(kāi)發(fā)者省去很多時(shí)間。

使用直接上代碼：

//
//  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:@"這是個(gè)按鈕" 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]; //此代碼比較重要，當(dāng)自定義view的時(shí)候，會(huì)導(dǎo)致item出不來(lái)
        UIMenuItem *item0 = [[UIMenuItem alloc]initWithTitle:@"復(fù)制" action:@selector(copyAction)];
        UIMenuItem *item1 = [[UIMenuItem alloc]initWithTitle:@"刪除" action:@selector(deletedAction)];
        menuController.menuItems = @[item0,item1];
        menuController.arrowDirection = UIMenuControllerArrowUp;
        [menuController setTargetRect:abtn.frame inView:self.view];
        [menuController setMenuVisible:YES animated:YES];
    }
}

// 是否能成為第一響應(yīng)者
- (BOOL)canBecomeFirstResponder
{
    return YES;
}

// 用于UIMenuController顯示，缺一不可
-(BOOL)canPerformAction:(SEL)action withSender:(id)sender{
    
    if (action == @selector(copyAction)
        || action ==@selector(deletedAction)){
        return YES;
    }
    return NO;//隱藏系統(tǒng)默認(rèn)的菜單項(xiàng)
}

- (void)copyAction
{
    NSLog(@"%s 第%d行",__FUNCTION__,__LINE__);
}

- (void)deletedAction
{
    NSLog(@"%s 第%d行",__FUNCTION__,__LINE__);
}

- (void)didReceiveMemoryWarning {
    [super didReceiveMemoryWarning];
    
}


@end

注意的點(diǎn)在于

一、是否能成為第一響應(yīng)者

// 是否能成為第一響應(yīng)者
- (BOOL)canBecomeFirstResponder
{
    return YES;
}

二、隱藏系統(tǒng)默認(rèn)的菜單項(xiàng) & 顯示自定義菜單

// 用于UIMenuController顯示，缺一不可
-(BOOL)canPerformAction:(SEL)action withSender:(id)sender{
    
    if (action == @selector(copyAction)
        || action ==@selector(deletedAction)){
        return YES;
    }
    return NO;//隱藏系統(tǒng)默認(rèn)的菜單項(xiàng)
}

三、成為第一響應(yīng)者

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