获取当前页面的最层控制器 (Swift 4)

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原创最新推荐文章于 2026-09-22 11:30:01 发布 3.7k 阅读 AI 写同款· GEO 优化 ›

详解iOS开发获取当前控制器的正取方式背景在开发过程中,经常需要获取当前 window, rootViewController, 以及当前 ViewController 的需求. 如果 .m 实现不是在当前视图情况下, 我们需要快速的获取到当前控制器, 这种情况就需要先做好一层封装,我一般是通过 UIViewController 写的一个 Category 来实现, 实现起来也非常简单, 只需要我们对 控制器几个方法掌握便可。获取根控制器 + (UIViewController *)jsd_getRootViewController{ UIWindow* window = [[[UIApplication shared 立即下载

第一种模式--->符合 UITabBarController ---> UINavigationController布局

~~//MARK: 获取当前页面的最顶层控制器 <此方法在ios13 later 会出问题，废弃>~~

func getCurrentVCBS() -> UIViewController {
    let keywindow = (UIApplication.shared.delegate as! AppDelegate).window//UIApplication.shared.keyWindow使用此有时会崩溃
    let firstView: UIView = (keywindow?.subviews.first)!
    let secondView: UIView = firstView.subviews.first!
    var vc = viewForController(view: secondView)!
    vc = ((vc as! UITabBarController).selectedViewController! as! UINavigationController).visibleViewController!
  
    return vc
}

private func viewForController(view:UIView)->UIViewController?{
    var next:UIView? = view
    repeat{
        if let nextResponder = next?.next, nextResponder is UIViewController {
            return (nextResponder as! UIViewController)
        }
        next = next?.superview
    }while next != nil
    return nil
}

//MARK: 校验结果的正确性

//classType: 当前页面类类型
func vcResult(classType: UIViewController.Type) -> Bool {
    return getCurrentVCBS().isKind(of: classType)
}

第二种模式--->所有

///获取当前显示的控制器 UIWindow (Visible)
func getCurrentVCBS2() -> UIViewController {
    let keywindow = (UIApplication.shared.delegate as! AppDelegate).window?.rootViewController//UIApplication.shared.keyWindow
    let rootVC = keywindow!//UIApplication.shared.keyWindow!.rootViewController!
    return getVisibleViewControllerFrom(vc: rootVC)
}

//方法1
func getVisibleViewControllerFrom(vc: UIViewController) -> UIViewController {
    
    if vc.isKind(of: UINavigationController.self) {
        return getVisibleViewControllerFrom(vc: (vc as! UINavigationController).visibleViewController!)
    } else if vc.isKind(of: UITabBarController.self) {
        return getVisibleViewControllerFrom(vc: (vc as! UITabBarController).selectedViewController!)
    } else {
        if (vc.presentedViewController != nil) {
            return getVisibleViewControllerFrom(vc: vc.presentedViewController!)
        } else {
            return vc
        }
    }
    
}

//方法2
func topViewControllerWithRootViewController(rootVC: UIViewController) -> UIViewController {
    
    if rootVC.isKind(of: UITabBarController.self) {
        let tabVC = rootVC as! UITabBarController
        return topViewControllerWithRootViewController(rootVC: tabVC.selectedViewController!)
    } else if rootVC.isKind(of: UINavigationController.self) {
        let navc = rootVC as! UINavigationController
        return topViewControllerWithRootViewController(rootVC: navc.visibleViewController!)
    } else if (rootVC.presentedViewController != nil) {
        return topViewControllerWithRootViewController(rootVC: rootVC.presentedViewController!)
    } else {
        return rootVC
    }
    
}

///验证
func vcResult2(classType: UIViewController.Type) -> Bool {
    return getCurrentVCBS2().isKind(of: classType)
}