Question

我使用for循环在scrollView中创建标签和按钮。是否可以删除我的scrollView中的所有对象？（我想用新内容更新它）

for peop in personArray{

        scrollView.clearContent ??????


        // Name label
        var label: UILabel = UILabel()
        label.frame = CGRectMake(8, CGFloat(nameHeight), 183, 21)
        label.backgroundColor = UIColor.whiteColor()
        label.textColor =  UIColor(red: 90/255.0, green: 187/255.0, blue: 206/255.0, alpha: 1.0)
        label.textAlignment = NSTextAlignment.Left
        label.font = UIFont (name: "HelveticaNeue-Light", size: 14)
        label.text = " \(peop.getName()) - \(sex)"
        self.scrollView.addSubview(label)


        //Delete button
        var button = UIButton.buttonWithType(UIButtonType.System) as UIButton
        button.tag = playerId
        button.frame = CGRectMake(199, CGFloat(nameHeight), 37, 21)
        button.backgroundColor = colorWheel.colorsArray[7]
        button.setTitle("Slet", forState: UIControlState.Normal)
        button.addTarget(self, action: "delAction:", forControlEvents: UIControlEvents.TouchUpInside)
        button.setTitleColor(UIColor.whiteColor(), forState: UIControlState.Normal)
        self.scrollView.addSubview(button)
        button.titleLabel!.font = UIFont(name: "HelveticaNeue-Light", size: 14)


        scrollHeight = scrollHeight + 29
        nameHeight = nameHeight + 29
        playerId++
    }
    scrollView.contentSize = CGSize(width: 20.0, height: CGFloat(nameHeight))
}

func delAction(sender: UIButton!){
    personArray.removeAtIndex(sender.tag)
    updatePeople()
}

Answer 1

你试过这个吗？

let subViews = self.scrollView.subviews
for subview in subViews{
    subview.removeFromSuperview()
}

Answer 2

一线解决方案，使用

scrollView.subviews.forEach({ $0.removeFromSuperview() })

<强>已更新

要仅删除特定类型的视图，请说UIButton使用

scrollView.subviews.forEach ({ ($0 as? UIButton)?.removeFromSuperview() })

Answer 3

可以使用标记从不同的类中删除一组对象。在创建对象集时设置标记。

label.tag = 99

现在，删除对象时，请使用：

func removeLabels() {
    let subViews = self.view.subviews
    for subview in subViews {
        if subview.tag == 99  {
            subview.removeFromSuperview()
        }
    }
}

Answer 4

您可以使用块方法执行此操作，

let views: NSArray = scroller.subviews

// 3 - remove all subviews
views.enumerateObjectsUsingBlock {
(object: AnyObject!, idx: Int, stop: UnsafeMutablePointer<ObjCBool>) -> Void in
  object.removeFromSuperview()
}

从ScrollView Swift中删除子视图

4 个答案: