`[NSUserDefaults standardUserDefaults]`返回nil

Question

I want to save some user preferences, but

NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];

just returns nil .

iOS-Developper Library says, that this should return the existing shared defaults object or create one if none exists... What am I missing?

I also use Appirater and there all this stuff seems also not to work...

This code gets called when the user pushes a button...

NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
int index = ([defaults integerForKey:@"BackgroundColorSpecifier"]+ 1)%self.backgroundColors.count;
[defaults setInteger:index forKey:@"BackgroundColorSpecifier"];
[defaults synchronize];

This gets called in application: didFinishLaunchingWithOptions:

NSUserDefaults *standardDefaults = [NSUserDefaults standardUserDefaults];
[standardDefaults registerDefaults:@{@"BackgroundColorSpecifier": @0}];
[standardDefaults synchronize];

When I debug this code snippets the green "position-indicator" jumps around in a very strange manner...

I don't have any clue, whats going on... Please help!

Answer 1

This is far more likely to be a problem with the debugger than anything else, particularly with your other issues. I've seen similar things in my own projects but don't have a reliable way of clearing it out other than the usual restart / clean options.

NSLogs will usually give more consistent results than the debugger if the debugger is having an off day.

NSUserDefaults isn't broken. We'd have heard about it by now.

Answer 2

you can use this function to log you userDefaults dic

 - (void)logCache
    {
        NSDictionary * dic = [[NSBundle mainBundle] infoDictionary];
        NSString *bundleId = [dic  objectForKey: @"CFBundleIdentifier"];
        NSUserDefaults *appUserDefaults = [[NSUserDefaults alloc] init];
        NSDictionary *cacheDic = [appUserDefaults persistentDomainForName: bundleId];
        NsLog(@"cacheDic::%@",cacheDic);
    }