［已解决］Swift中Property的willSet中警告：Attempting to store to property within its own willSet, which is about to be overwritten by the new value

［问题］

swift代码：

class RecordTabBarController : UIViewController {
    var viewControllers = [UIViewController]()
    {
        willSet(newViewControllers){
            。。。。。 
            viewControllers = newViewControllers

出现警告：⚠️

Attempting to store to property ‘viewControllers’ within its own willSet, which is about to be overwritten by the new value

如图：

要去搞清楚，此警告是否一定要解决掉，还是可以忽略无所谓。

因为觉得这个警告有点怪：

本来在willSet，就是拿到newXXX进行处理掉，把旧的XXX换掉。

结果Xcode却还是警告。不知道为啥。

［解决过程］

1.搜：

swift Attempting to store to property within its own willSet, which is about to be overwritten by the new value

参考：

这个警告是什么原因啊-敏捷大拇指-智能移动社区,垂直到苹果新语言swift

ios – Attempting to store to property ” within its own willSet – Stack Overflow

说是一个已知的bug：

Developer Forums: Compiler warns on non-setting willSet

前面加上self即可：

self.viewControllers = newViewControllers

［总结］

此处，在willSet中用新的值newXXX，赋值给旧的值XXX，出现了警告：

Attempting to store to property within its own willSet, which is about to be overwritten by the new value

原因是：

这个是Xcode本身的bug

解决办法是：

在旧的值前面加上self.，变成self.XXX即可。

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