iphone - viewDidLoad 时使用 NSUserDefaults 加载存储的注释的字幕

Question

基本上，我尝试做的是将字幕（街道地址）保存到注释中。当应用程序终止并重新启动时，我希望这个存储的字幕显示在注释的标注中。我究竟做错了什么？我只是无法让它工作......

storeLocation.m

- (void)setCoordinate:(CLLocationCoordinate2D)coor {
                  ............

                    NSUserDefaults *userDef = [NSUserDefaults standardUserDefaults];
                    [userDef setValue:subtitle forKey:@"SavedAddress"];
                    [userDef synchronize];
                    NSLog(@"Stored subtitle");
                }

主视图控制器.m

-(void)viewDidLoad {
                NSString *savedAddress = [[NSUserDefaults standardUserDefaults] objectForKey:@"SavedAddress"];
    if (savedAddress) {
    }                
}

非常感谢您对此的帮助...在此先感谢！

Answer 1

尝试srtingForKey:代替objectForKey:

NSString *savedAddress = [[NSUserDefaults standardUserDefaults] stringForKey:@"SavedAddress"];

Answer 2

我用 if 语句解决了它

-(NSString *)subtitle. 

以便：

-(NSString *)subtitle{

    NSUserDefaults *userDef = [NSUserDefaults standardUserDefaults];
    if ([userDef boolForKey:@"SavedAddress"]) {
        NSString *savedAddress = [[NSUserDefaults standardUserDefaults] stringForKey:@"SavedAddress"];
        return savedAddress;
    }

    else {
        return subtitle;
    }
}