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在iOS8 Swift中更改UINavigationBar Headers

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我以编程方式在我的Superview中添加了UINavigationBar，名为BaseViewController，它继承了UIViewController . 但是当我尝试为UINavigationBar设置 Headers 时 . 我收到名为 fatal error: Can't unwrap Optional.None 的错误

以下是我的快速课程 . 如何解包和更改UINavigationBar Headers

import UIKit

class BaseViewConroller: UIViewController {
    var navBar:UINavigationBar=UINavigationBar()

    override func viewDidLoad() {
        super.viewDidLoad()
        setNavBarToTheView()
        // Do any additional setup after loading the view.
        navBar.topItem.title="test test"
    }

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }

    func setNavBarToTheView()
    {
        navBar.frame=CGRectMake(0, 0, 320, 50)
        navBar.backgroundColor=(UIColor .blackColor())
        self.view .addSubview(navBar)
    }

}
uinavigationbar swift ios8

4 回答

  • 28

    将 navBar.topItem.title="test test" 替换为 self.title="test test" . 干杯！！

    回复于
  • 0

    以实际方式更改导航栏文本 . 只需调用下面写的func setNavigationBarTitleText("WhateverTextNeeded") 即可 . 我假设您已经配置了UINavigationBar .

    var navBar = UINavigationBar(frame: CGRectZero)

func setNavigationBarTitleText(text: String){
    let titleLabel = UILabel(frame: CGRectMake(0, 0, view.frame.size.width - 120, 44))
    titleLabel.backgroundColor = UIColor.clearColor()
    titleLabel.numberOfLines = 2
    titleLabel.font = UIFont(name: UIConfig.Fonts.OswaldRegular,  size: 16)
    titleLabel.textAlignment = NSTextAlignment.Center
    titleLabel.text = text.uppercaseString
    self.navBar.topItem?.titleView = titleLabel
}

    我希望这有帮助 .

    回复于
  • 0
    UILabel *labelTitle = UILabel(frame: CGRectZero);
labelTitle.text = "Title";
labelTitle.text.textAlignment = NSTextAlignment.Center
self.navigationItem.titleView = labelTitle;

    我有这个代码...我希望，这可以帮到你 .

    回复于
  • 0

    您可以使用此代码转换导航栏 .

    self.navigationController?.navigationBar.backIndicatorImage = UIImage(named: "imageName")
    self.navigationController?.navigationBar.backIndicatorTransitionMaskImage = UIImage(named: "imageName")
    self.navigationController?.navigationBar.backItem?.title = ""
    self.navigationController?.navigationBar.tintColor = UIColor.white
    self.title = "Title"
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