Swift正确加载xib文件的方法 [英] Swift proper way to load xib file

问题描述

我在swift项目中加载xib文件有一些奇怪的问题。这太令人沮丧，因为我已经知道如何在Obj-C中做到这一点。但是因为swift很快，所以你不能像你那样做..：/

I have some strange problem with loading xib file in swift project. It's so frustrating because I already know how to do it in Obj-C. But since swift is swift so you can't do it like you did.. :/

所以我创建了IconTextFiled.xib和IconTextField.swift。 （扩展UITextField）在xib中我在Idenity检查器中填充字段类，在故事板中我对一些textFields执行相同的操作。所以我们很高兴只需从xib添加加载到init方法？没有。

So I have create IconTextFiled.xib and IconTextField.swift. (extends UITextField) In xib I fill field Class in Idenity inspector and in storyboard I do the same for some textFields. So we good to go just add loading from xib to init method? No.

在objc我会这样做

- (instancetype)initWithCoder:(NSCoder *)coder
{
    self = [super initWithCoder:coder];
    if (self) {
        NSArray *nib = [[NSBundle mainBundle] loadNibNamed:@"IconTextField" owner:self options:nil];
        self = [nib objectAtIndex:0];
    }
    return self;
}

所以我想如果我转换为swift它会很好。

So I thought if I translate to swift it will be good.

required init(coder aDecoder: NSCoder) {
    super.init(coder: aDecoder)
    let nib:NSArray = NSBundle.mainBundle().loadNibNamed("IconTextField", owner: self, options: nil)
    self = nib.objectAtIndex(0)
}

但这不起作用。我不知道为什么，但它试图创建更多的对象并崩溃

But that doeasn't work. I don't know why but it try to create much more object and crash

最后我找到了扩展名

extension IconTextField {
    class func loadFromNibNamed(nibNamed: String, bundle : NSBundle? = nil) -> IconTextField? {
        return UINib(
            nibName: nibNamed,
            bundle: bundle
            ).instantiateWithOwner(nil, options: nil)[0] as? IconTextField
    }
}

所以在ViewController中它看起来像

So in ViewController it looks like

@IBOutlet var password: IconTextField!
override func viewDidLoad() {
    super.viewDidLoad()
    password = IconTextField.loadFromNibNamed("IconTextField")
}

再次失败。你能告诉我你如何加载和使用xib文件吗？

And again fail. Could you tell me how you load and use xib files?

Ok以后关注Daniel anwser

Ok following after Daniel anwser

我当前的代码

class IconTextField: UITextField {
    @IBOutlet var icon: UIImageView!
    @IBOutlet weak var view: UIView!

    required init(coder aDecoder: NSCoder) {
        super.init(coder: aDecoder)
        NSLog("initWithCoder \(self)")
        NSBundle.mainBundle().loadNibNamed("IconTextField", owner: self, options: nil)
        self.addSubview(view)
    }   
}

这两个var连接到那些视图

Those two var are connected to those views

Consoleo输出，更大，以 EXC_BAD_ACCESS

Consoleo output, was a lot bigger and end with EXC_BAD_ACCESS

2014-10-24 10:09:09.984 testproject[20337:3757479] initWithCoder <stensgroup.IconTextField: 0x7be7bfb0;>
2014-10-24 10:09:09.984 testproject[20337:3757479] initWithCoder <stensgroup.IconTextField: 0x7be7ddf0;>
2014-10-24 10:09:09.985 testproject[20337:3757479] initWithCoder <stensgroup.IconTextField: 0x7be7fa20;>
2014-10-24 10:09:09.985 testproject[20337:3757479] initWithCoder <stensgroup.IconTextField: 0x7be814f0;>
2014-10-24 10:09:09.986 testproject[20337:3757479] initWithCoder <stensgroup.IconTextField: 0x7be830c0;>
2014-10-24 10:09:10.083 testproject[20337:3757479] initWithCoder <stensgroup.IconTextField: 0x7d183270;>
2014-10-24 10:09:10.084 testproject[20337:3757479] initWithCoder <stensgroup.IconTextField: 0x7d187cd0;>
2014-10-24 10:09:10.084 testproject[20337:3757479] initWithCoder <stensgroup.IconTextField: 0x7d189960;>

它应该只有两个initWithCoder。接缝func loadNibNamed正在调用 initWithCoder

It should be only two initWithCoder. It seams that func loadNibNamed is calling initWithCoder

推荐答案

这对我有用：

class IconTextField: UITextField {
    @IBOutlet weak var view: UIView!
    @IBOutlet weak var test: UIButton!

    required init(coder: NSCoder) {
        super.init(coder: coder)
        NSBundle.mainBundle().loadNibNamed("IconTextField", owner: self, options: nil)
        self.addSubview(view)
        assert(test != nil, "the button is conected just like it's supposed to be")
    }
}

一旦 loadNibNamed：owner：options：被称为 view 和 test 按钮按预期连接到插座。添加笔尖的视图self的子视图层次结构使得笔尖的内容可见。

Once loadNibNamed:owner:options: is called the view and test button are connected to the outlets as expected. Adding the nib's view self's subview hierarchy makes the nib's contents visible.

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