UIMenuController的使用，对UILabel拷贝以及定制菜单

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1. Menu所处的View必须实现 – (BOOL)canBecomeFirstResponder, 且返回YES这个一定要返回YES

2. Menu所处的View必须实现 – (BOOL)canPerformAction:withSender, 并根据需求返回YES或NO

3. 使Menu所处的View成为First Responder (becomeFirstResponder)

4. 定位Menu (- setTargetRect:inView:)

5. 展示Menu (- setMenuVisible:animated:)

////  ViewController.m//  UIMenuController////  Created by 陆巧怡 on 15/9/6.//  Copyright © 2015年 Simon. All rights reserved.//#import "ViewController.h"@interface ViewController ()@property (nonatomic, strong) NSString *text;@property (nonatomic, strong) UILabel *label;@end@implementation ViewController- (void)viewDidLoad {    [super viewDidLoad];    self.label = [[UILabel alloc]initWithFrame:CGRectMake(0, 100, 300, 30)];    self.label.text = @"点击出现UIMenuController";    self.label.userInteractionEnabled = YES;    [self.view addSubview:self.label];            UITapGestureRecognizer *touch = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(handleTap:)];    touch.numberOfTapsRequired = 1;    [self.label addGestureRecognizer:touch];    }-(void)handleTap:(UIGestureRecognizer*) recognizer{    //是当前的对象成为第一响应者    [self becomeFirstResponder];    //创建UIMenuController的控件    UIMenuItem *flag = [[UIMenuItem alloc] initWithTitle:@"国旗" action:@selector(flag:)];    UIMenuItem *approve = [[UIMenuItem alloc] initWithTitle:@"Approve" action:@selector(approve:)];    UIMenuItem *deny = [[UIMenuItem alloc] initWithTitle:@"Deny" action:@selector(deny:)];        UIMenuController *menu = [UIMenuController sharedMenuController];    [menu setMenuVisible:NO];    [menu setMenuItems:[NSArray arrayWithObjects:flag, approve, deny, nil]];    [menu setTargetRect:self.label.frame inView:self.label.superview];    [menu setMenuVisible:YES animated:YES];}#pragma mark UIMenuController 控件方法- (void)flag:(id)sender {    NSLog(@"国旗");}- (void)approve:(id)sender {    NSLog(@"Approve");}- (void)deny:(id)sender {    NSLog(@"Deny");}- (void)didReceiveMemoryWarning {    [super didReceiveMemoryWarning];}#pragma mark 默认是为NO的。这里一定要设置成YES 要不然就不会出现- (BOOL)canBecomeFirstResponder{    return YES;}//针对于copy的实现-(void)copy:(id)sender{    //这里是粘贴板 可以复制文字，图片    UIPasteboard *pboard = [UIPasteboard generalPasteboard];    pboard.string = self.label.text;}-(BOOL)canPerformAction:(SEL)action withSender:(id)sender{        //这里也是间接影响显示在UIMenuController的控件    if (action == @selector(copy:)) {        return YES;    }else if (action == @selector(flag:)){        return NO;    }else if (action == @selector(approve:)){        return YES;    }else if (action == @selector(deny:)){        return YES;    }else{        return [super canPerformAction:action withSender:sender];    }}@end

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