直接上结果
UIMenuController * menu = [UIMenuController sharedMenuController];
[self.view becomeFirstResponder];
UIMenuItem * item1 = [[UIMenuItem alloc]initWithTitle:@"复制1" action:@selector(copyText:)];
menu.menuItems = @[item1];
[menu setTargetRect:weak_label.bounds inView:weak_label];
dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(0.2 * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{
[menu setMenuVisible:YES animated:YES];
显示的时候添加个延迟!!真是大坑