iOS在故事板中画好界面 在APPDelegate里面设置启动这个页面的时候 看不见控件

Question

AppDelegate 代码

• (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {

  ViewController *vc = [ViewController new];
  vc.dictUserInfo=@{@"User":[[NSUserDefaults standardUserDefaults] objectForKey:@"User"],
  @"Pwd" : [[NSUserDefaults standardUserDefaults] objectForKey:@"Pwd"],
  @"IP" : [[NSUserDefaults standardUserDefaults] objectForKey:@"IP"]
  };
  self.window.rootViewController = vc;
  return YES;
  }

ViewController.m 代码

• (void)viewDidLoad { [super viewDidLoad]; self.view.backgroundColor=[UIColor whiteColor]; self.alertView = [[UIAlertView alloc]initWithTitle:@"失败" message:@"你好" delegate:self cancelButtonTitle:@"确定" otherButtonTitles:nil, nil]; [self.view addSubview:self.alertView]; self.txtIP.delegate = self; self.txtUser.delegate = self; self.txtPwd.delegate =self; }

-(void)viewWillAppear:(BOOL)animated
{
[super viewWillAppear:animated];
self.txtUser.text =self.dictUserInfo[@"User"];
self.txtPwd.text = self.dictUserInfo[@"Pwd"];
self.txtIP.text = self.dictUserInfo[@"IP"];
}

• (IBAction)btnLoginClick:(id)sender {
  NSString *user =self.txtUser.text;
  NSString *pwd = self.txtPwd.text;
  NSString *address = self.txtIP.text;

  if (user.length>0&&pwd.length>0&&address.length>0) {
      [[NSUserDefaults standardUserDefaults] setObject:user forKey:@"User"];
      [[NSUserDefaults standardUserDefaults] setObject:pwd forKey:@"Pwd"];
      [[NSUserDefaults standardUserDefaults] setObject:address forKey:@"IP"];
  }
  else
  {
      self.alertView.message=@"参数输入错误！";
      [self.alertView show];
  }
  

  }

-(BOOL)textFieldShouldReturn:(UITextField *)textField
{
[textField resignFirstResponder];
return YES;
}

Answer 1

你的ViewController 都重新初始化了，当然就没有了