ios自定义下拉菜单Demo

ios自定义下拉菜单Demo，非常简单的例子，直接使用就可以的。 if (showList) {//如果下拉框已显示，什么都不做 return; }else {//如果下拉框尚未显示，则进行显示 CGRect sf = self.frame; sf.size.height = frameHeight; //把dropdownList放到前面，防止下拉框被别的控件遮住 [self.superview bringSubviewToFront:self]; tv.hidden = NO; showList = YES;//显示下拉框 CGRect frame = tv.frame; frame.size.height = 0; tv.frame = frame; frame.size.height = tabheight; [UIView beginAnimations:@"ResizeForKeyBoard" context:nil]; [UIView setAnimationCurve:UIViewAnimationCurveLinear]; self.frame = sf; tv.frame = frame; [UIView commitAnimations];