iOS-编码/解码枚举-重新启动后访问时崩溃

我做错了什么？我是否正确编码/解码枚举类型

游戏设置界面：

typedef enum {
    CatWhite = 0,
    CatBlack = 1,
    CatOrange = 2
} CatColor;

...
CatColor catColor;
...
@property CatColor catColor;

游戏设置实现：

@synthesize catColor;

...

+ (GameSettings*)GetInstance
{
    if (sharedSingleton == nil) {
        sharedSingleton = [[super allocWithZone:NULL] init];
        sharedSingleton.catColor = CatWhite;
    }
    return sharedSingleton;
}
    -(void)encodeWithCoder:(NSCoder *)coder {
        [coder encodeInt:self.catColor forKey:@"CatColor"];
    }

    -(id)initWithCoder:(NSCoder *)coder {
        if((self = [super init])) {
            self.catColor = [coder decodeIntForKey:@"CatColor"];
        }
NSLog(@"initWithCoder: %d", self.catColor); //this logs the correct int
        return self;
    }

AppDidFinishLaunching:

    - (void)applicationDidFinishLaunching:(UIApplication *)application {    

        NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
        NSData *data = [defaults objectForKey:@"GameSettings"];
        GameSettings *gGameData = [NSKeyedUnarchiver unarchiveObjectWithData:data];
        if(gGameData != NULL) {
            GameSettings *settings = [GameSettings GetInstance];
            settings.catColor = gGameData.catColor;

        }else {
            GameSettings *settings = [GameSettings GetInstance];
            settings.catColor = CatWhite;
        }
        ...
    }

保存设置：

GameSettings* settings = [GameSettings GetInstance];

NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
NSData *data = [NSKeyedArchiver archivedDataWithRootObject:settings];
[defaults setObject:data forKey:@"GameSettings"];
[defaults synchronize];

GameSettings* settings = [GameSettings GetInstance];
NSLog(@"settings: %d", settings); //EXC_BAD_ACCESS
NSLog(@"catColor: %d", settings.catColor); //EXC_BAD_ACCESS

当我重新启动应用程序并尝试访问游戏设置时，会出现崩溃（程序收到信号：“EXC_BAD_ACCESS”）：

GameSettings* settings = [GameSettings GetInstance];

NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
NSData *data = [NSKeyedArchiver archivedDataWithRootObject:settings];
[defaults setObject:data forKey:@"GameSettings"];
[defaults synchronize];

GameSettings* settings = [GameSettings GetInstance];
NSLog(@"settings: %d", settings); //EXC_BAD_ACCESS
NSLog(@"catColor: %d", settings.catColor); //EXC_BAD_ACCESS

---

为什么我不能在重新启动后访问GameSettings singleton

是否确实要在此处使用ApplicationIDFinishLaunching？当您重新启动程序时，它可能正在调用awakeFromNib而不是applicationdifinishlaunting（源：）。

是否确实要在那里使用applicationdifinishlaunting？当您重新启动程序时，它可能会调用awakeFromNib，而不是applicationdifinishlaunching（source:）。

最终解决了这个问题。游戏设置被解除分配，因为NSKeyedUnachiver正在自动释放它：

GameSettings *gGameData = [NSKeyedUnarchiver unarchiveObjectWithData:data];

修正：

---

终于弄明白了。游戏设置被解除分配，因为NSKeyedUnachiver正在自动释放它：

GameSettings *gGameData = [NSKeyedUnarchiver unarchiveObjectWithData:data];

修正：

---

我假设GameSettings继承自NSObject，但果真如此吗？我想我应该问问。对界面进行微调也会使大部分界面脱离上下文，这并没有真正的帮助。另外，

GetInstance

看起来像什么？您可以从调试器控制台发布堆栈跟踪吗？@nil，是的，它继承自NSObject。我已经在上面添加了Get Instance方法。我假设GameSettings继承自NSObject，但果真如此吗？我想我应该问问。对界面进行微调也会使大部分界面脱离上下文，这并没有真正的帮助。另外，

GetInstance

看起来像什么？您可以从调试器控制台发布堆栈跟踪吗？@nil，是的，它继承自NSObject。我在上面添加了Get实例方法。