带有自己的 XIB 的 UIView 子类 [英] UIView subclass with its own XIB

问题描述

我创建了一个自定义 UIView 子类，并且不想在 UIView 子类中的代码中布局 UI.我想为此使用xib.所以我所做的是以下.

I created a custom UIView subclass, and would prefer to not layout the UI in code in the UIView subclass. I'd like to use a xib for that. So what I did is the following.

我创建了一个ShareView"类，它是 UIView 的子类.我创建了一个 XIB 文件，其文件所有者设置为ShareView".然后我链接了我在ShareView.h"中声明的一些网点.

I created a class "ShareView" which subclasses UIView. I created a XIB file with its file's owner set to "ShareView". Then I link some outlets I declared in my "ShareView.h".

接下来我有一个 ViewController，MainViewController，它将 ShareView 添加为子视图.带有此代码:

Next I have a ViewController, MainViewController, which adds the ShareView as a subview. whith this code:

NSArray *arr = [[NSBundle mainBundle] loadNibNamed:@"ShareView" owner:nil options:nil];
UIView *fv = [[arr objectAtIndex:0] retain];
fv.frame = CGRectMake(0, 0, 320, 407);
[self.view addSubview:fv];

但现在我在 ShareView 中声明的出口出现 NSUnknownKeyException 错误.

But now I get NSUnknownKeyException errors on the outlets I declared in my ShareView.

我做这一切的原因是因为我想要一个 UIView，在单独的 XIB 文件中有它自己的逻辑.我在几个地方读到 ViewControllers 仅用于管理全屏，即不是屏幕的一部分......那我做错了什么?我希望我的 ShareView 逻辑在一个单独的类中，所以我的 MainController 类不会因 ShareView 的逻辑而变得臃肿(我认为这是解决这个问题的一个选项?)

The reason I did all this is because I want a UIView, with its own logic in a seperate XIB file. I read in several places that ViewControllers are only used to manage a full screen, i.e. not parts of a screen... So what am I doing wrong? I want my logic for ShareView in a seperate class, so my MainController class doesn't get bloated with logic from ShareView (which I think is an aption to solve this problem?)

推荐答案

ThomasM,

我们对在自定义视图中封装行为也有类似的想法(例如，一个带有最小/最大/当前值伴随标签的滑块，值更改事件也由控件内部处理).

We had similar ideas about encapsulating behavior inside a custom view (say, a slider with companion labels for min/max/current values, with value-changed events also handled by the control internally).

在我们当前的最佳实践中，我们将在 Interface Builder (ShareView.xib) 中设计 ShareView，如 Eimantas 在他的回答中所述.然后我们将 ShareView 嵌入到 MainViewController.xib 中的视图层次结构中.

In our current best-practice, we would design the ShareView in Interface Builder (ShareView.xib), as described by Eimantas in his answer. We then embed the ShareView to the view hierarchy in MainViewController.xib.

我写了我们如何将自定义视图 Nib 嵌入其他 Nib 中iOS 开发者博客.关键是在自定义视图中覆盖 -awakeAfterUsingCoder:，将从 MainViewController.xib 加载的对象替换为从嵌入式" Nib (ShareView.xib) 加载的对象.

I wrote up how we embed custom-view Nibs inside other Nibs in our iOS developer blog. The crux is overriding -awakeAfterUsingCoder: in your custom view, replacing the object loaded from MainViewController.xib with the one loaded from the "embedded" Nib (ShareView.xib).

大致如下:

// ShareView.m
- (id) awakeAfterUsingCoder:(NSCoder*)aDecoder {
    BOOL theThingThatGotLoadedWasJustAPlaceholder = ([[self subviews] count] == 0);
    if (theThingThatGotLoadedWasJustAPlaceholder) {
        // load the embedded view from its Nib
        ShareView* theRealThing = [[[NSBundle mainBundle] loadNibNamed:NSStringFromClass([ShareView class]) owner:nil options:nil] objectAtIndex:0];

        // pass properties through
        theRealThing.frame = self.frame;
        theRealThing.autoresizingMask = self.autoresizingMask;

        [self release];
        self = [theRealThing retain];
    }
    return self;
}

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