在 Swift 中继承 UINavigationBar [英] Subclassing UINavigationBar in Swift

问题描述

我正在尝试创建一个自定义 UINavigationBar 类，然后使用 Storyboard 将其设置为我的 UINavigationController 的类导航栏.

I'm trying to create a custom UINavigationBar class and then use the Storyboard to set it as the class of my UINavigationController's NavigationBar.

这是我的 UINavigationBar 类的代码:

Here's the code of my UINavigationBar class:

class CustomNavBar: UINavigationBar {

    override func drawRect(rect: CGRect) {
        super.drawRect(rect)
        // Drawing code
        self.backgroundColor = UIColor.orangeColor()

        let myLabel = UILabel(frame: CGRect(x: 0, y: 4, width: 600, height: 36))
        myLabel.backgroundColor = UIColor.purpleColor()
        myLabel.textColor = UIColor.yellowColor()
        myLabel.text = "Custom NavBar!"

        self.addSubview(myLabel)
    }

}

然后，在 Interface Builder 中，我使用 Identity Inspector 将其设置为我的 UINavigationController 的 NavigationBar 的类.

Then, in Interface Builder, I use the Identity Inspector to set this as the class of the NavigationBar of my UINavigationController.

当我运行应用程序时 - 它冻结了.它挂在 LaunchScreen.xib 上，什么也不做.

When I run the App - it freezes. It hangs up on the LaunchScreen.xib and doesn't do anything.

为什么要这样做?这样做的正确方法是什么?

Why is doing that? What's the right way to go about doing this?

推荐答案

关于 Swift:

File-New-File-iOS Source-Cocoa Touch 类-选择 UINavigationBar 的子类并将其命名为 CustomNavigationBar.

File-New-File- iOS Source - Cocoa Touch class- Select Subclass of : UINavigationBar and Name it - CustomNavigationBar.

class CustomNavigationBar: UINavigationBar {

        override init(frame: CGRect) {
            super.init(frame: frame)

            self.backgroundColor = UIColor.redColor()

        }
        required init(coder aDecoder: NSCoder) {
            super.init(coder: aDecoder)!
        }
        override func drawRect(rect: CGRect) {

        }   
    }

这篇关于在 Swift 中继承 UINavigationBar的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！