Swift子类UIView [英] Swift subclass UIView

问题描述

我想继承UIView的类，并显示类似视图的登录名.我已经在Objective-C中创建了它，但是现在我想将其移植到Swift.我不使用情节提要，所以我用代码创建了所有UI.

I want to subclass UIView and show a login like view. I've created this in Objective-C, but now I want to port it to Swift. I do not use storyboards, so I create all my UI in code.

但是第一个问题是我必须实现initWithCoder.我给了它一个默认的实现，因为它不会被调用.现在，当我运行程序时，它崩溃了，因为我还必须实现initWithFrame.现在我明白了:

But the first problem is that I must implement initWithCoder. I gave it a default implementation since It won't be called. Now when I run the program it crashes, because I've to implement initWithFrame as well. Now I got this:

override init() {
    super.init()
    println("Default init")
}

override init(frame: CGRect) {
    super.init(frame: frame)
    println("Frame init")
}

required init(coder aDecoder: NSCoder) {
    super.init(coder: aDecoder)
    println("Coder init")
}

我的问题是我应该在哪里创建文本字段等?如果我从不实现框架和编码器，该如何隐藏"?这个吗?

My question is where should I create my textfield etc... and if I never implement frame and coder how can I "hide" this?

推荐答案

我通常会这样做，但有点冗长.

I usually do something like this, its a bit verbose.

class MyView: UIView {
    override init(frame: CGRect) {
        super.init(frame: frame)
        addBehavior()
    }

    convenience init() {
        self.init(frame: CGRect.zero)
    }

    required init(coder aDecoder: NSCoder) {
        fatalError("This class does not support NSCoding")
    }

    func addBehavior() {
        print("Add all the behavior here")
    }
}



let u = MyView(frame: CGRect.zero)
let v = MyView()

(我已经编辑了答案，以使初始化程序之间的关系更加清晰)

( I've edited my answer so that the relation between the initializers is more clear)

这篇关于Swift子类UIView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！