ios - NSUserDefaults 机会 UISwitch 值

Question

我有 2 个不同的 View 设置 View 和默认 View

我无法将 uiswitch 值传递给默认 View

开关在 NSUserDefaults 中存储位置

设置 View .m

- (void)viewDidLoad
{
    [super viewDidLoad];
    NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];

    if ([defaults objectForKey:@"SwitchState"])
        self.BlowSwitch.on = [defaults boolForKey:@"SwitchState"];

}

- (IBAction)saveSwitchState:(id)sender
{
    NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];

    if  ([self.BlowSwitch isOn]){
        [defaults setBool:YES forKey:@"SwitchState"];
        //[defaults synchronize];
        [[NSNotificationCenter defaultCenter] postNotificationName:@"SwitchState" object:self userInfo:nil];
    }
    else{
        [defaults setBool:NO forKey:@"SwitchState"];
        [defaults synchronize];
        [[NSNotificationCenter defaultCenter] postNotificationName:@"SwitchState" 
                                                            object:self userInfo:nil];
    }
}

默认 View .m

- (void)viewDidLoad {

    [super viewDidLoad];
    [[NSNotificationCenter defaultCenter] addObserver:self
                                             selector:@selector(onAppSettingsChanged:)                                                                          name:@"SwitchState"
                                               object:nil];
}

- (void) onAppSettingsChanged:(NSNotification*)notification {
    NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
    BOOL completed = [defaults boolForKey:@"SwitchState"];

    if (completed == YES) {
        //bla bla bla
    }
}

Answer 1

你不执行[defaults synchronize]检查时[self.BlowSwitch isOn] ，删除评论，然后重试。