Swift:以递归方式遍历所有子视图以查找特定的类并追加到数组 [英] Swift: Recursively cycle through all subviews to find a specific class and append to an array

问题描述

试图弄清楚这一点有一段时间的魔鬼.我在这里问了类似的问题:迅速:获取特定类型的所有子视图并添加到数组中

Having a devil of a time trying to figure this out. I asked a similar question here: Swift: Get all subviews of a specific type and add to an array

虽然可行，但我意识到有很多子视图和子子视图，因此我需要一个从主UIView开始，在所有子视图(及其子视图中循环直到没有剩余的子视图)的函数，并且将其添加到名为CheckCircle的自定义按钮类的数组中.

While this works, I realized there are many subviews and sub-sub views, and so I need a function that starts at the main UIView, cycles through all the subviews (and their subviews until there aren't any left) and adds it to an array for a custom button class which I have named CheckCircle.

基本上，我想以CheckCircles数组结束，这些数组构成以编程方式添加到该视图的所有CheckCircles.

Essentially I'd like to end up with an array of CheckCircles which constitute all the CheckCircles added to that view programmatically.

有什么想法吗?这就是我一直在努力的事情.它似乎没有将任何Checkcircles附加到数组:

Any ideas? Here's what I've been working on. It doesn't seem to be appending any Checkcircles to the array:

    func getSubviewsOfView(v:UIView) -> [CheckCircle] {
        var circleArray = [CheckCircle]()
        // Get the subviews of the view

        var subviews = v.subviews

        if subviews.count == 0 {
            return circleArray
        }

        for subview : AnyObject in subviews{
  if let viewToAppend = subview as? CheckCircle {
        circleArray.append(viewToAppend as CheckCircle)
      }
            getSubviewsOfView(subview as! UIView)
        }
        return circleArray
    }

推荐答案

您的主要问题是，当您调用getSubviewsOfView(subview as! UIView)(在函数内递归)时，您对结果不执行任何操作.

Your main problem is that when you call getSubviewsOfView(subview as! UIView) (recursively, within the function), you aren't doing anything with the result.

您还可以删除count == 0检查，因为在这种情况下，for…in循环将被跳过.您也有很多不必要的演员

You also can delete the count == 0 check, since in that case the for…in loop will just be skipped. You also have a bunch of unnecessary casts

假设您希望获得CheckCircle个实例的平面数组，那么我认为对代码的这种修改应该有效:

Assuming your desire is to get a flat array of CheckCircle instances, I think this adaptation of your code should work:

func getSubviewsOfView(v:UIView) -> [CheckCircle] {
    var circleArray = [CheckCircle]()

    for subview in v.subviews as! [UIView] {
        circleArray += getSubviewsOfView(subview)

        if subview is CheckCircle {
            circleArray.append(subview as! CheckCircle)
        }
    }

    return circleArray
}

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