UIMenuController使用

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");
}