Xcode 4.2中的多个视图 [英] Multiple Views in Xcode 4.2

问题描述

我在找不到在没有故事板的情况下在Xcode 4.2中实现多个视图的教程时遇到了很多麻烦，这是一个类，所以我还不能使用storyboard。当我在主视图中点击一个按钮时，我只是试图找到一个UIPicker的第二个视图，我找不到这个版本的Xcode，它与旧版本的不同，让我感到困惑。

I'm having a lot of trouble finding a tutorial for implementing multiple views in Xcode 4.2 without storyboard, this is for a class so I can't use storyboard yet. I'm just trying to have a 2nd view with a UIPicker come up when a button is clicked in the main view, I just can't find one for this version of Xcode and it's different enough from the older versions to confuse me.

如果有人能够快速描述我需要做什么或者更新的教程我会很感激，感谢任何帮助：）

Any help appreciated if someone can give me a quick description of what I need to do this or a newer tutorial I'd appreciate it :)

推荐答案

我认为你应该阅读 UIView编程指南，以便很好地处理 UIView 的工作原理。我发现nibs / storyboard非常适合混淆新的iOS开发人员。

I think you should read the UIView Programming Guide to get a good handle on how UIViews work exactly. I find nibs/storyboard are really great at confusing new iOS developers.

本质上， UIViewController 有一个你在 viewDidLoad中设置的视图或 loadView 方法，使用 [self setView：someUIView] 。通过添加 UIView s作为viewcontroller的Main视图的子视图，可以在屏幕上添加更多内容。例如

In essence, a UIViewController has 1 view which you set in the viewDidLoad or loadView method by using the [self setView:someUIView]. You add more stuff to the screen by adding UIViews as a subview of the viewcontroller's "Main" view. For example

-(void)loadView {
    // Create a view for you view controller
    UIView *mainView = [[UIView alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
    [self setView:mainView];

    // Now we have a view taking up the whole screen and we can add stuff to it
    // Let's try a button, a UIButton is a subview of UIView
    UIButton *newButton = [[UIButton buttonWithType:UIButtonTypeRoundedRect];
    // We need to set a frame for any view we add so that we specify where it should
    // be located and how big it should be!
    [newButton setFrame:CGRectMake(x,y,width,height)];
    // Now let's add it to our view controller's view
    [self.view addSubview:newButton];

    // You can do the same with any UIView subclasses you make!
    MyView *myView = [[MyView alloc] init];
    [myView setFrame:CGRectMake(x,y,width,height)];
    [self.view addSubview:myView];

}

现在我们有了viewController，他们认为只是一个普通的UIView，它又有2个子视图; newButton和myView。由于我们创建了MyView类，也许它也包含子视图！让我们来看看UIView子类的外观：

Now here we have our viewController who'se view is just a plain UIView which in turn has 2 subviews; newButton and myView. Since we created the MyView class, maybe it contains subviews as well! Let's take a look at what a UIView subclass could look like:

// Here is the init method for our UIView subclass
- (id)initWithFrame:(CGRect)frame
{
    self = [super initWithFrame:frame];
    if (self) {
        // Let's add a button to our view
        UIButton *newButton2 = [[UIButton buttonWithType:UIButtonTypeRoundedRect];
        // Of course, the frame is in reference to this view
        [newButton2 setFrame:CGRectMake(x,y,width,height)];
        // We add just using self NOT self.view because here, we are the view!
        [self addSubview:newButton2];

    }
    return self;
}    

所以在这个例子中我们有一个视图控制器，现在查看包含2个按钮！但视图结构是树：

So in this example we would have a view controller who'se view now contains 2 button! But the view structure is a tree:

           mainView
          /      \
  newButton     myView
                  \
                newButton2

如果您有任何其他问题，请与我们联系！

Let me know if you have any other questions!

马特

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