在載入地方加上這段
 [helpview setUserInteractionEnabled:YES];

    [helpview addGestureRecognizer:[[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(clickCategory:)]];
事件
-(void)clickCategory:(UITapGestureRecognizer *)gestureRecognizer
{
    helpview.hidden=true;

}

參考：
2014, 冰冻鱼
http://www.pocketdigi.com/20140218/1276.html
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