Mac开发，实现移动鼠标到指定区域显示提示

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// 设置监听

[self.itemButton addTrackingArea:[[NSTrackingArea alloc] initWithRect:self.bounds options:NSTrackingActiveAlways|NSTrackingInVisibleRect|NSTrackingMouseEnteredAndExited owner:self userInfo:nil]];

- (void)mouseEntered:(NSEvent *)event

{

    [super mouseEntered:event];

    _theMenu = [[NSMenu alloc] initWithTitle:@""];

    NSMenuItem *item = [[NSMenuItem alloc]init];

    item.title = @"你好啊";

     [_theMenu addItem:item3];

     [NSMenu popUpContextMenu:_theMenu withEvent:event forView:self.itemButton];

}

- (void)mouseExited:(NSEvent *)event

{

    [super mouseExited:event];

    [_theMenu removeAllItems];

    _theMenu = nil;

}