从另一个类方法更新UI - Cocoa [英] Update UI from another Class Method - Cocoa

问题描述

我想从AppDelegate更新我的应用程序中的UI，但是每当我这样调用它：

I would like to update the UI in my application from the AppDelegate, but whenever I call it as so:

Controller *object = [[Controller alloc] init];
[object methodHere];

似乎没有更新UI。我在这里做错了什么？我把一个NSLog，看看是否被调用，它是。 这里是显示错误的示例项目。

It doesn't seem to update the UI. What am I doing wrong here? I have put in a NSLog to see if it was being called, and it is. Here is a sample project that shows the error.

编辑：有人可以告诉我什么改变到我提供的项目。我只是不知道要输入到我的项目，以便我可以更改一个简单的NSTextField的值从另一个类。

Can someone just show me what to change to the project I provided. I just don't know what to type into my project so that I can change the value of a simple NSTextField from another class.

推荐答案

这很简单，Chuck的意见基本上解释了你需要做什么，但我会为你明确的布局代码。在 testAppDelegate.h 中：

This is really simple, and Chuck's comments basically explain what you need to do, but I will lay out the code explicitly for you. In testAppDelegate.h:

@interface testAppDelegate : NSObject <NSApplicationDelegate> {
    NSWindow *window;
    // You can make an IBOutlet to any kind of object you
    // want; it's just a way for you to get a reference
    // in code to an object that has been alloc'd and
    // init'd already by the xib mechanism.
    IBOutlet Controller *controller;

}

然后在InterfaceBuilder中进入你的xib，从测试应用程序委托对象到您的Controller对象（这些对象已经存在于xib中）。

Then go into your xib in InterfaceBuilder and hook up that outlet from your Test App Delegate object to your Controller object (these objects are already present in the xib).

在 testAppDelegate.m ：

- (void)applicationDidFinishLaunching:(NSNotification *)aNotification {
    // This is the key:
    // _Don't_ alloc/init a new controller object. The 
    // objects in your xib are allocated and initialized 
    // by virtue of being in that file. You just need to 
    // give your AppDelegate a pointer to it, as above.
    [controller setTextValue:@"hello"];
}

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