在UINavigationcontroller堆栈中将ViewController推入时，它会变黑

Question

我有一个UInavigationController堆栈。 在RootViewController我有button。 当我单击按钮时，将按下一个新的viewcontroller并显示UIDatePicker 。 问题是导航到View Controller时显示日期选择器1秒钟，然后突然消失，整个屏幕变为黑色。 这是代码

//rootviewcontroller 
- (IBAction)dateAction:(id)sender 
{
    self.another = [[AnotherViewController   alloc]initWithButtonWithTag:self.dateButton.tag andDelegate:self];
    [self.navigationController pushViewController:self.another animated:YES];
    self.another.navigationItem.title = @"DateName";
}



//second viewcontroller

- (void)viewDidload 
{
    self.pickerView = [[UIDatePicker alloc] initWithFrame:CGRectMake(0, 250, 325, 300)];
    [self.pickerView addTarget:self action:@selector(datePickerDidChangeDate:)  forControlEvents:UIControlEventValueChanged];

    self.pickerView.datePickerMode = UIDatePickerModeDate;
    self.pickerView.hidden = NO;
    self.pickerView.date = [NSDate date];

    self.formatter = [[NSDateFormatter alloc] init];

    self.formatter.dateStyle = NSDateFormatterLongStyle;

    [self.view addSubview:self.pickerView];
}

帮助将不胜感激

Answer 1

试试这个代码...

第一视图控制器

- (void)viewDidLoad
{
    [super viewDidLoad];
    NSArray *temp=[NSArray arrayWithObjects:@"button1" ,@"button2" ,@"button3",nil];
    for (int i=0; i<=2; i++)
    {
        _likeBtn=[UIButton buttonWithType:UIButtonTypeCustom];
        [_likeBtn setFrame:CGRectMake(20+(i*80), 220, 102, 20 )];
        [_likeBtn setTitleColor:[UIColor blueColor] forState:UIControlStateNormal];
        [_likeBtn setTitle:[temp objectAtIndex:i] forState:UIControlStateNormal];
        [_likeBtn addTarget:self action:@selector(action:) forControlEvents:UIControlEventTouchUpInside];
        [_likeBtn setTag:i];
        [self.view addSubview:_likeBtn];
    }

    // Do any additional setup after loading the view from its nib.
}
- (IBAction)action:(id)sender

{
    UIButton *button=(UIButton *)sender;
    NSLog(@"%d",button.tag);
    secViewController *obj = [[secViewController alloc]init];
    obj.tagValue=button.tag;
    [self.navigationController pushViewController:obj animated:YES];
    obj.navigationItem.title = @"DateName";
}

第二个视图.h文件

 @property(nonatomic,assign) NSInteger *tagValue;

.m文件

- (void)viewDidLoad
{
    [super viewDidLoad];
    NSInteger *tag=self.tagValue;

    if (tag==0)
    {
        //tableView
        NSLog(@"tableview");
    }
    else
    {
        //datepicker
        NSLog(@"picker");

          self.pickerView = [[UIDatePicker alloc] initWithFrame:CGRectMake(0, 250, 325, 300)];
          [self.pickerView addTarget:self action:@selector(datePickerDidChangeDate:)  forControlEvents:UIControlEventValueChanged];
                self.pickerView.datePickerMode = UIDatePickerModeDate;
            self.pickerView.hidden = NO;
           self.pickerView.date = [NSDate date];
          self.formatter = [[NSDateFormatter alloc] init];
            self.formatter.dateStyle = NSDateFormatterLongStyle;
            [self.view addSubview:self.pickerView];
    }

    // Do any additional setup after loading the view from its nib.
}
-(void)datePickerDidChangeDate:(id)sender
{
    NSLog(@"%@",self.pickerView.date);
}

让我知道是否已注册...