如何更改UIView的z索引或堆栈顺序？ [英] How do I change the z index or stack order of UIView?

问题描述

我在现有控制器的顶部堆叠了一个UIView，以创建一个渐变层。但是，当我加载视图时，新的UIView（自然地）就在所有内容之上。

I've stacked a UIView on top of an existing controller in an effort to create a gradient layer. However, when I load the view the new UIView (naturally) is on top of everything.

相关代码：

class ViewController: UIViewController {

    @IBOutlet weak var myGradientView: GradientView!

    override func viewDidLoad() {
        super.viewDidLoad()            
    }

    override func viewDidLayoutSubviews() {
        self.myGradientView.gradientWithColors(UIColor.whiteColor(), UIColor.blueColor())
    }
}

我已经做了一些搜索，我找到了目标中的答案-C 解释使用：

I've done some searching and I found an answer in Objective-C that explains to use:

[parentView bringSubviewToFront：view];

[parentView bringSubviewToFront:view];

我不知道Objective-c并且对Swift来说还是新手，如果有人可以对此有所启发，我会很感激。

I don't know objective-c and am fairly new to Swift, if someone could shine some light on this I would appreciate it.

如何更改Swift中UIView的z索引或堆栈顺序？

How do I change the z index or stack order of a UIView in Swift?

推荐答案

我建议查看 UIView 文档，其中列出了几种操作子视图顺序的方法：

I would recommend looking in the UIView documentation, where are several methods listed for the manipulation of the order of subviews:

bringSubviewToFront(_:)
sendSubviewToBack(_:)
removeFromSuperview()
insertSubview(_:atIndex:)
insertSubview(_:aboveSubview:)
insertSubview(_:belowSubview:)
exchangeSubviewAtIndex(_:withSubviewAtIndex:)

在您的情况下，您可以尝试：

In your situation, you could try:

self.view.sendSubviewToBack(myGradientView)
// self is your view controller in this case.

或者，因为您创建了 myGradientView IB，您可以更改视图层次结构以更改顶部显示的视图。这是一张图片来说明：

Alternatively, because you created the myGradientView in IB, you could change the view hierarchy to change which views appeared on top. Here's a picture to illustrate:

希望有所帮助。

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