iOS中UIMenuController的使用

不知你有沒有發現，在你的微信朋友中，長按一段文字（正文或者評論），會彈出這樣子的玩意：

這玩意很眼熟是吧？沒錯，你經常見到它，在很多iOS系統應用中，你想複製一段文字到另一處粘貼，你只要長按一下，這玩意就出來了。既然iOS自家的app中都有這個，那麼它一定有封裝的控件吧，以前我不知道他到底叫什麼，後來公司的項目中要用到這玩意了，當時打算自己實現，還叫設計MM切了圖，囧，但是在百度上谷歌了一番後，發現這個玩意在UIKit庫裏原來叫UIMenuController！廢話不多說了，讓我們來看看這個東西怎麼用的吧！先讓我們來看一下效果，我想在一段文字上長按就會彈出這個小東西：

要想在你的view或者viewController中實現長按彈出菜單欄你必須要調用becomeFirstResponder方法，其次要實現canBecomeFirstResponder方法，並返回YES.

#import "ViewController.h"

@interface ViewController ()
@property (weak, nonatomic) IBOutlet UILabel *label;


@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.

    self.view.backgroundColor = [UIColor groupTableViewBackgroundColor];

    //設置label的userInteractionEnabeld屬性爲YES
    _label.userInteractionEnabled = YES;

    //添加長按手勢
    [_label addGestureRecognizer:[[UILongPressGestureRecognizer alloc] initWithTarget:self action:@selector(longPress:)]];

}


- (void)longPress:(UILongPressGestureRecognizer *)sender
{
    if (sender.state == UIGestureRecognizerStateBegan) {
        [self.view becomeFirstResponder];

        _label.backgroundColor = [UIColor lightGrayColor];

        UIMenuController *menu = [UIMenuController sharedMenuController];

        //複製
        UIMenuItem *copyItem = [[UIMenuItem alloc] initWithTitle:@"複製" action:@selector(copyItemClicked:)];

        //收藏
        UIMenuItem *collectItem = [[UIMenuItem alloc] initWithTitle:@"收藏" action:@selector(collectItemClicked:)];

        //舉報
        UIMenuItem *reportItem = [[UIMenuItem alloc] initWithTitle:@"舉報" action:@selector(reportItemClicked:)];

        menu.menuItems = @[copyItem,collectItem,reportItem];

        [menu setMenuVisible:YES animated:YES];

        [menu setTargetRect:_label.frame inView:self.view];
    }
    if (sender.state == UIGestureRecognizerStateEnded) {
        _label.backgroundColor = [UIColor clearColor];
    }

}
//處理item點擊事件
- (void)copyItemClicked:(UIMenuItem *)item
{
    NSLog(@"複製");
}

- (void)collectItemClicked:(UIMenuItem *)item
{
    NSLog(@"收藏");
}

- (void)reportItemClicked:(UIMenuItem *)item
{
    NSLog(@"舉報");
}

//- (BOOL)canPerformAction:(SEL)action withSender:(id)sender
//{
//    if (action == @selector(copyItemClicked:)) {
//        return YES;
//    }else if(action == @selector(resendItemClicked:))
//    {
//        return YES;
//    }
//    
//    return [super canPerformAction:action withSender:sender];
//    
//}

- (BOOL)canBecomeFirstResponder
{
    return YES;
}

- (void)didReceiveMemoryWarning {
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}



@end