用作全局变量的AppDelegate的变量不起作用 [英] Variable of AppDelegate used as global variable doesn't work

问题描述

我想使用我的AppDelegate来存储一个对象，任何其他类都可以访问。我已经声明这个AppDelegate像这样：

I would like to use my AppDelegate to store a object which will be accessible to any other classes. I've declared this AppDelegate like this :

@interface MyAppDelegate : UIResponder <UIApplicationDelegate>
{
    MyClass *tracker;
}

@property (strong, nonatomic) UIWindow *window;
@property (strong, nonatomic) ICViewController *viewController;
@property (retain, nonatomic) MyClass *tracker;

@end

我合成跟踪器和应用程序：didFinishLaunchingWithOptions：i set该对象中的一个NSString类似于：

I synthesize tracker and in application:didFinishLaunchingWithOptions: i set one NSString in that object like this :

self.tracker = [[MyClass alloc] init];
self.tracker.testGlobal = @"global funguje";

当我需要在其他类别的地方访问tracker时，使用这个代码：

When i need to access tracker somewhere else in some other class i use this code :

MyAppDelegate *appDelegate = (MyAppDelegate *)[[UIApplication sharedApplication] delegate];    
MyClass *trackerTEST = appDelegate.tracker;
NSLog(@"TEST : %@",trackerTEST.testGlobal);

问题是testGlobal是NULL。我做错了什么？这里还有MyClass的类文件：

The problem is that testGlobal is NULL. What am I doing wrong? Also here are class files for MyClass :

@interface MyClass : NSObject
{
    NSString *testGlobal;
}
@property (retain, nonatomic) NSString *testGlobal;
@end

@implementation MyClass
@synthesize testGlobal = _testGlobal;
@end

感谢您的任何帮助！

推荐答案

检查应用程序：didFinishLaunchingWithOptions：是否正在通过添加 NSLog @...）。如果 trackerTEST 为nil，则可能无法正确初始化。

Check if application:didFinishLaunchingWithOptions: is being called by adding a NSLog(@"..."). If trackerTEST is nil, it was possibly not correctly initialized.

这篇关于用作全局变量的AppDelegate的变量不起作用的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！