子类化具有xib的子类UIViewController [英] Subclassing a subclassed UIViewController that has a xib

问题描述

我需要有一些看起来非常相似但有不同行为的UIViewControllers，所以我想我会用xib创建一个通用的UIViewController子类，然后在需要的时候将它子类化，对于那些看起来相似的UIViewController。

I need to have a few UIViewControllers that look very similar yet have different behaviours, so I thought I'd make a general UIViewController subclass with a xib, then subclass it when I need to, for those different UIViewController's that look alike.

我正在尝试实现以下

UIViewController子类（已关联xib文件） - >并且能够按照我想要的次数进行子类化（没有为孩子们添加额外的xib文件）

UIViewController subclass (that has a xib file associated) -> and being able to subclass it as many times as i'd like (without additional xib files for the children)

到目前为止我做了什么：

what I've done so far :

xib文件表示具有多个UI元素的UIViewController。

xib file represents a UIViewController with multiple UI Elements.

我已将所有连接设置为文件的所有者@ xib文件。

I've set all the connections to file's owner @ xib file.

带有xib的子类包含这个@init方法：

the subclass with the xib contains this @ init method:

self = [[[NSBundle mainBundle] loadNibNamed:
                 [NSString stringWithFormat:@"ParentViewController"]
                                              owner:self options:nil] objectAtIndex:0];

当我将xib中的View属性连接到文件的所有者时，我得到一个异常，说我不能
将View属性连接到父UIViewControllers和子UIViewControllers。

when I connect the View property in the xib to file's owner I get an exception saying I can't have the View property connected to both parent and child UIViewControllers.

但是当View属性只连接到与xib关联的UIViewController时，我得到一个空白的屏幕，并且该插座不可断开。

yet when the View property is only connected to the UIViewController that the xib is associated with, I get a blank screen, and that outlet isn't disconnectable.

如果我实例化父vc而不是孩子，一切正常，
如果一切都是以编程方式完成而不是使用xib，一切正常。

If I instantiate the parent vc instead of the child, everything works fine, If everything is done programatically and not with a xib, also everything works fine.

因为这个UIViewController显示了很多UI元素，我试图用xib设置它。

since this UIViewController displays A LOT of UI elements, I'm trying to set it with a xib.

我真的不明白如何让孩子ViewControllers看起来像父的xib文件，并有自己的添加和行为。

I just don't really understand how can I get the child ViewControllers to look like the parent's xib file and have their own additions and behaviours.

推荐答案

如果你只有父类的xib（但没有子类），你可以在子类init中执行此操作：

If you only have an xib for the parent class (but none of the subclasses), you can just do this in your subclass init:

- (instancetype) init {
    if (self = [super initWithNibName:@"ParentViewController" bundle:nil]) {
      // init stuff for subclass
    }
    return self;
 }

这是一个示例项目：

https://github.com/annabd351/SubClassFromParentNib

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