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思路

在Swift的代碼中堡牡，Controller沒(méi)有銷(xiāo)毀大部分的原因都是沒(méi)有weak self午绳。怎么檢測(cè)一個(gè)Controller沒(méi)有釋放呢筒溃？

1马篮、當(dāng)一個(gè)對(duì)象銷(xiāo)毀的時(shí)候，它會(huì)調(diào)用deinit的方法怜奖，一般Controller頁(yè)面我們都是放在UINavigationController里面的浑测，然后調(diào)用push和pop，實(shí)現(xiàn)我們頁(yè)面的跳轉(zhuǎn)歪玲。

2迁央、繼承UINavigationController怎顾，重寫(xiě)push方法，在push方法里面把push的controller的名字放到單例的數(shù)組里面漱贱，deinit的時(shí)候在把當(dāng)前的controller從單例里面釋放槐雾，然后檢測(cè)單例里面有沒(méi)有controller的相同名字存在2個(gè)以上的。

代碼實(shí)現(xiàn)

因?yàn)槭菣z測(cè)Controller有沒(méi)有銷(xiāo)毀的工具幅狮，然后打印到console里查看募强，所以代碼應(yīng)該在DEBUG模式下執(zhí)行。

如果使用的UI架構(gòu)師tabbar加幾個(gè)controllers的樣式崇摄，初始化tabbar的時(shí)候會(huì)調(diào)用push擎值。所以判斷如果是tabbarcontroller直接return

func defaultController() -> UINavigationController {
    let navi = JYNavigationViewController.init(rootViewController: JYTabBarViewController())

    return navi
}

func pushVc(_ vc: UIViewController) {
    #if DEBUG

    if vc is JYTabBarViewController {
        return
    }
    
    vcs.append(NSStringFromClass(vc.classForCoder))
    
    #endif
}

在繼承的NavigationController實(shí)現(xiàn)push代碼

override open func pushViewController(_ viewController: UIViewController, animated: Bool) {
    viewController.hidesBottomBarWhenPushed = self.viewControllers.count > 0
    
    if self.viewControllers.count > 0 {
        viewController.showLeftButton()
    }
    
    CheckWselfHelper.shared.pushVc(viewController)
    
    super.pushViewController(viewController, animated: animated)
}

在pop代碼里調(diào)用數(shù)組的filter函數(shù)，過(guò)濾掉當(dāng)前controller名字相同的內(nèi)容逐抑，然后遍歷數(shù)組鸠儿，篩選出數(shù)組中名字相同有大于1個(gè)controller，并打印出來(lái)

func popVc(_ vc: UIViewController?) {
    #if DEBUG
        guard let vc = vc else {return}
        
        let str = NSStringFromClass(vc.classForCoder)
        vcs = vcs.filter({$0 != str})
        
        var datas = [String: Int]()
        
        vcs.forEach({ (str) in
            datas[str] = (datas[str] ?? 0)+1
        })
        
        datas.forEach({ (key, value) in
            if value > 1 {
                Log.i("注意"+key+"沒(méi)有釋放")
            }
        })

    #endif
}

在BaseController的deinit方法里實(shí)現(xiàn)我們的pop函數(shù)

deinit {
    CheckWselfHelper.shared.popVc(self)
}

由于我是tabba的ui架構(gòu)厕氨，所以在點(diǎn)擊tabbar的時(shí)候會(huì)push很多tabbar和navigation的controller进每。所以在點(diǎn)擊和初始化的時(shí)候清空下我們的單例數(shù)組。

func clearVcs(_ addVc: UIViewController?) {
    #if DEBUG

    vcs.removeAll()
    
    guard let addVc = addVc else {return}
    
    pushVc(addVc)
        
    #endif
}

在tabbar里面的實(shí)現(xiàn)如下

初始化的時(shí)候清空

func initViews() {
    
    let tvc = JYTicketViewController()
    let ticketVc: JYNavigationViewController = JYNavigationViewController(rootViewController: tvc)
    let mallVc: JYNavigationViewController = JYNavigationViewController(rootViewController: JYMallViewController())
    let mineVc: JYNavigationViewController = JYNavigationViewController(rootViewController: JYMineViewController())
    
    ticketVc.tabBarItem.title = "購(gòu)票"
    ticketVc.tabBarItem.image = UIImage.init(named: "ticket_normal")?.withRenderingMode(.alwaysOriginal)
    ticketVc.tabBarItem.selectedImage = UIImage.init(named: "ticket_selected")?.withRenderingMode(.alwaysOriginal)
    
    mallVc.tabBarItem.title = "商城"
    mallVc.tabBarItem.image = UIImage.init(named: "mall_normal")?.withRenderingMode(.alwaysOriginal)
    mallVc.tabBarItem.selectedImage = UIImage.init(named: "mall_selected")?.withRenderingMode(.alwaysOriginal)
    
    mineVc.tabBarItem.title =  "我的"
    mineVc.tabBarItem.image = UIImage.init(named: "mine_normal")?.withRenderingMode(.alwaysOriginal)
    mineVc.tabBarItem.selectedImage = UIImage.init(named: "mine_selected")?.withRenderingMode(.alwaysOriginal)

    self.tabBar.barTintColor = UIColor.white
    self.tabBar.tintColor = AppConfig.mainColor
    
    let lists = [ticketVc, mallVc, mineVc]
    self.viewControllers = lists
    self.delegate = self
    self.selectedIndex = 0
    ticketVc.navigationBar.isTranslucent = false
    mallVc.navigationBar.isTranslucent = false
    mineVc.navigationBar.isTranslucent = false
    
    CheckWselfHelper.shared.clearVcs(tvc)//這里初始化默認(rèn)選中的controller

}

點(diǎn)擊tabbar的時(shí)候清空

// MARK: UITabBarControllerDelegate
func tabBarController(_ tabBarController: UITabBarController, shouldSelect viewController: UIViewController) -> Bool {
    CheckWselfHelper.shared.clearVcs(viewController.childViewControllers.first)
    
    return true
}

CheckWselfHelper.swift

https://gist.github.com/jackyshan/7a084291a03ae55815631697be1ae995