UIMenuController的简单使用

UIMenuController 使用详解

最新推荐文章于 2025-09-05 14:01:23 发布

转载最新推荐文章于 2025-09-05 14:01:23 发布 · 160 阅读

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原文链接：https://my.oschina.net/zsyzone/blog/850189

文章标签：

#python

本文介绍了如何在 iOS 应用中使用 UIMenuController 实现自定义的上下文菜单功能。通过创建 ZsyTextField 类并重写相应方法，文章详细展示了如何添加长按手势识别并设置上下文菜单项及其响应动作。

2019独角兽企业重金招聘Python工程师标准>>>

//
//  ZsyTextField.m
//  UIMenuController使用简介
//
//  Created by Zsy on 15/3/2.
//  Copyright © 2017年 Zsy. All rights reserved.
//

#import "ZsyTextField.h"

@implementation ZsyTextField

- (void)awakeFromNib {
    [self setUp];
}

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

- (void)setUp {
    self.userInteractionEnabled = YES;
    [self addGestureRecognizer:[[UILongPressGestureRecognizer alloc]initWithTarget:self action:@selector(longPress)]];
}

- (void)longPress {
    //1.设置label为第一响应者
    //通过设置第一响应者UIMenuController可以获得支持哪些操作的信息,操作怎么处理
    [self becomeFirstResponder];

    //2.设置UIMenuController
    UIMenuController * menu = [UIMenuController sharedMenuController];
    //当长按label的时候，这个方法会不断调用，menu就会出现一闪一闪不断显示，需要在此处进行判断
    if (menu.isMenuVisible) {
        return;
    }
    UIMenuItem *item1 = [[UIMenuItem alloc] initWithTitle:@"剪切" action:@selector(myCut:)];
    UIMenuItem *item2 = [[UIMenuItem alloc] initWithTitle:@"粘贴" action:@selector(myPasete:)];
    UIMenuItem *item3 = [[UIMenuItem alloc] initWithTitle:@"清空" action:@selector(myEmpty:)];
    menu.menuItems = @[item1, item2, item3];
    [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(myCut:) || action == @selector(myPasete:) || action == @selector(myEmpty:)) {
        return YES;
    }
    return NO;
}

- (void)myCut:(UIMenuController *)menu {
    [self copy:menu];
    self.text = nil;
}

- (void)cut:(UIMenuController *)menu {
    [self copy:menu];
    self.text = nil;
}

- (void)copy:(UIMenuController *)menu {
    if (!self.text) {
        return;
    }
    UIPasteboard *paste = [UIPasteboard generalPasteboard];
    paste.string = self.text;
}

- (void)myPasete:(UIMenuController *)menu {
    UIPasteboard *paste = [UIPasteboard generalPasteboard];
    self.text = paste.string;
}

- (void)myEmpty:(UIMenuController *)menu {
    self.text = nil;
}

@end

转载于:https://my.oschina.net/zsyzone/blog/850189