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导航UI未使用Xcode 9更新

uinavigationitem user-interface xcode swift ios

0

Ian · 技术社区 · 8 年前

当我从服务器下载完数据模型后,我试图更新我的navigationItem标题视图。

类似这样:

private func loadNews() {
    self.newsModelManager.sendRequest(inBackground: false, preSendHandler: { (isReachable) in
        if isReachable {

        } else {
            appDelegate.showInternetFailedAlertView()
        }
    }, successHandler: { (response) in
        print("loadNewsModel: successHandler")
    }, errorHandler: { (response) in
        print("loadNewsModel: errorHandler")
    }, reloginFailHandler: { (response) in
        appDelegate.showReloginFailedAlertView()
    }) { (isReachable) in
        let array = self.newsModelManager.loadFirstFiveNews()!
        DispatchQueue.main.async {
            self.setupTitle_ViewWith(array: array)
        }
    }
}

在seupTitle_ViewWith中(数组:)

func setupTitle_ViewWith(array: [NewsModel]?) {
    guard array != nil else { return }
    let frame = CGRect(x: 0, y: 0, width: 200, height: 40)
    let newsTitle_View = NewsTitleView(newsModelArray: array!, frame: frame)
    newsTitle_View.newsTitleViewDelegate = self
    self.title_View = newsTitle_View
}

self.title_View = newsTitle_View

我想这会将我的标题视图更新到我的CustomView, 那里可能出了什么问题?

我首先用realm从服务器保存模型,并在 let array = self.newsModelManager.loadFirstFiveNews()!

2 回复 | 直到 8 年前

1

Bharath 8 年前

您好,这里是解决这个问题的简要总结,供其他可能面临类似问题的人参考,

https://stackoverflow.com/a/20923010/4510873 )

因此,我们尝试从viewController更新标题视图,它解决了我们的问题。

2

1

Bishan 8 年前

我认为你可以通过使用本地通知来解决这个问题,

private func loadNews() {
    self.newsModelManager.sendRequest(inBackground: false, preSendHandler: { (isReachable) in
        if isReachable {

        } else {
            appDelegate.showInternetFailedAlertView()
        }
    }, successHandler: { (response) in
        print("loadNewsModel: successHandler")
    }, errorHandler: { (response) in
        print("loadNewsModel: errorHandler")
    }, reloginFailHandler: { (response) in
        appDelegate.showReloginFailedAlertView()
    }) { (isReachable) in
        let array = self.newsModelManager.loadFirstFiveNews()!
        DispatchQueue.main.async {
            NSNotificationCenter.defaultCenter().postNotificationName("refresh", object:array)
        }
    }
}

2) 然后在ViewController中,将其粘贴到viewDidLoad中

NSNotificationCenter.defaultCenter().addObserver(self, selector: #selector(ViewController.setupTitle_ViewWith), name: "refresh", object: array)

func setupTitle_ViewWith(notification: NSNotification){
    let array = notification.object as! NSArray
    guard array != nil else { return }
    let frame = CGRect(x: 0, y: 0, width: 200, height: 40)
    let newsTitle_View = NewsTitleView(newsModelArray: array!, frame: frame)
    newsTitle_View.newsTitleViewDelegate = self
    self.title_View = newsTitle_View
}