UIMenuController使用

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iOS的APP中经常有这样的需求，长按某个地方（最多的是tableview的cell，例如聊天界面的某条消息），弹出一个黑色的横向菜单，如图：

这个控件就是系统自带的UIMenuController。

1. 使用这个控件需要做到以下三点：

a.在view（cell）或者viewController中调用-becomeFirstResponder方法；
b.你的view获得或者view controller需要实现 -canBecomeFirstResponder 方法,返回YES;
c.你的view获得或者view controller需要实现-canPerformAction:action withSender:sender 方法来隐藏或者现实响应的item；

2.代码展示

添加长按事件

UILongPressGestureRecognizer *longPress = [[UILongPressGestureRecognizer alloc] initWithTarget:self action:@selector(handleLongPress:)];    longPress.numberOfTouchesRequired = 1;    longPress.minimumPressDuration = 1.f;    [self.msgContentView addGestureRecognizer:longPress];

响应方法

- (void)handleLongPress:(UILongPressGestureRecognizer *)longPress {    if (longPress.state !=  UIGestureRecognizerStateBegan){        return;    }else{        NSLog(@"handleLongPress");        [self becomeFirstResponder];        UIMenuController *popupMenuController = [UIMenuController sharedMenuController];        NSMutableArray *array = [NSMutableArray arrayWithCapacity:0];        UIMenuItem *copyMenuItem = [[UIMenuItem alloc] initWithTitle:@"copy" action:@selector(messageCopy:)];        UIMenuItem *forwardMenuItem = [[UIMenuItem alloc] initWithTitle:@"forward" action:@selector(messageForward:)];        [array addObject:copyMenuItem];        [array addObject:forwardMenuItem];        [popupMenuController setMenuItems:array];        CGPoint location = [longPress locationInView:self];        [popupMenuController setTargetRect:CGRectMake(location.x, [longPress view].frame.origin.y, 0, 0) inView:self];        [popupMenuController setMenuVisible:YES animated:YES];    }}

实现两个系统方法

//为了UIMenuController生效，以下两个系统方法必须实现-(BOOL)canPerformAction:(SEL)action withSender:(id)sender{    if (action == @selector(messageCopy:)||action == @selector(messageForward:)) {        return YES;    }    return NO;}- (BOOL)canBecomeFirstResponder{    return YES;}

菜单响应方法

- (void)messageCopy:(id)sender {    NSLog(@"messageCopy");}- (void)messageForward:(id)sender {    NSLog(@"messageForward");}

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