关于UIMenuController的使用总结

1. Menu的初始化设置

- (void)showMenuAtRect:(CGRect)rect inView:(UIView *)inView
{
    [self becomeFirstResponder];

    UIMenuController *theMenu = [UIMenuController sharedMenuController];
    [theMenu setMenuVisible:NO animated:YES];
    UIMenuItem *copyItem = [[[UIMenuItem alloc] initWithTitle:@"复制" action:@selector(copyAction:)] autorelease];
    [theMenu setMenuItems:[NSArray arrayWithObjects:copyItem,nil]];
    [theMenu setTargetRect:rect inView:inView];
    [theMenu setMenuVisible:YES animated:YES];
    
}

需要注意的是  

[self becomeFirstResponder];

一定不能少了

2. Menu的事件响应及显示下面两个方法不能少了，返回Yes

-(BOOL)canPerformAction:(SEL)action withSender:(id)sender{
    
    if (action == @selector(copyAction:)) {
        return YES;
    }
    
    return NO;
}

-(BOOL)canBecomeFirstResponder{  // 默认是NO
    return YES;
}