小编Mon*_*awy的帖子

如何在JSON中使用if语句这是代码:...................................... .................................................

var config =
             [
                {
                    "name"      : "SiteTitle",
                    "bgcolor"   : "",
                    "color"     : "",
                    "position"  : "TL",
                    "text"      : "step1",
                    "time"      : 5000
                },
                {
                    "name"      : "Jawal",
                    "bgcolor"   : "",
                    "color"     : "",
                    "text"      : "step2",
                    "position"  : "BL",
                    "time"      : 5000
                },
                {
                    "name"      : "Password",
                    "bgcolor"   : "",
                    "color"     : "",
                    "text"      : "step3",
                    "position"  : "TL",
                    "time"      : 5000
                }
            ],

            //define if steps should change automatically
            autoplay    = false,
            //timeout for the step …

以下代码正在运行,但有一个错误.场景是,我首先登录进入应用系统.登录成功后,应用程序将设置UserDefaults(UserId).之后,我可以使用存储的UserId导航应用程序视图.一旦我进入设置和选项卡注销,这将清理UserId并转到登录视图.

BUG:当我再次登录应用程序并单击主页按钮转到iPhone桌面并关闭应用程序,然后返回再次打开它仍然存储UserId.所以,如果我去设置并注销,将清理UserId,不会进入登录视图.我不知道为什么.

代码:

- (IBAction)resetKeychain:(id)sender {

    UIActionSheet *actionSheet = [[UIActionSheet alloc] 
                 initWithTitle:@"Are you sure you want to logout?" 
                 delegate:self 
                 cancelButtonTitle:@"Cancel" 
                 destructiveButtonTitle:@"Logout"
                 otherButtonTitles:nil];
    actionSheet.actionSheetStyle = UIActionSheetStyleDefault;
    [actionSheet showFromTabBar:self.tabBarController.tabBar];
    [actionSheet release];

}

- (void)actionSheet:(UIActionSheet *)actionSheet clickedButtonAtIndex:(NSInteger)buttonIndex {
    if (buttonIndex ==0) {
        //logout
        NSUserDefaults * defaults = [NSUserDefaults standardUserDefaults];
        //delete user ID fro user Defaults
        [defaults setObject:nil forKey:@"UserId"];
        //redirect to login view

        NewClassMoonAppDelegate * appsDelegate =[[UIApplication sharedApplication] delegate];
        [appsDelegate.window addSubview:[appsDelegate.login view]];

    }
}