一:获取view所在的ViewController
由于UIView和UIViewController都继承UIResponder,且其中涉及到UIResponder响应链中的关系,所以先讨论如何找到用户所点击View,当用户点击一个View时,会首先响应UIApplication中的UIWindow然后一步一步往下查找,直到找到用户点击的View。
关系为:UIWindow->ViewController.View->ViewA - - ->用户点击的View,
而获取View所在的ViewController是上面的逆序操作,关系为:view->superView->ViewController->UIWindow->UIApplication->UIDelegete->nil。
参考 UIResponder响应链
//对UIView的扩展
extension UIView{
func getFirstViewController()->UIViewController?{
for view in sequence(first: self.superview, next: {$0?.superview}){
if let responder = view?.next{
if responder.isKind(of: UIViewController.self){
return responder as? UIViewController
}
}
}
return nil
}
}
//实现
override func viewDidLoad() {
super.viewDidLoad()
//调用
let mView = UIView(frame: CGRect(origin: CGPoint.zero, size:CGSize(width: 100, height: 100)))
mView.backgroundColor = UIColor.red
self.view.addSubview(mView)
//获取mView的ViewController
let vc = mView.getFirstViewController()
}
转载于:https://www.cnblogs.com/chenxiaopao/p/9108022.html