iOS : UIScrollView scrolling reset controls position to initials

Question

我正在创建一个注册屏幕，如果用户想要更改 PIN，他应该点击更改 PIN 标签，它将在 PIN UITextField 之后添加两个 UITextField 控件(新 PIN 和确认新 PIN)，并将以下字段推到下方 100 像素处。

问题是当我尝试 ScrollView 以查看下面的控件时，它会将控件(我向下​​移动)重置为初始位置。

ViewDidLoad

[NSTimer scheduledTimerWithTimeInterval:0.1
                                     target:self selector:@selector(forScrollView)userInfo:nil repeats:NO];
    UITapGestureRecognizer *singleTap = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(ShowChangePINFields:)];
    singleTap.numberOfTapsRequired = 1;
    _lblChangePIN.userInteractionEnabled = YES;
    [_lblChangePIN addGestureRecognizer:singleTap];

- (void) forScrollView {
    NSLog(@"setScrollEnabled");
    [self.scrollview setScrollEnabled:YES];
    [self.scrollview setContentSize:CGSizeMake(320, 900)]; // must be greater then the size in Storyboard
}// Dispose of any resources that can be recreated.
BOOL isNewPINShow = NO;
    -(void)ShowChangePINFields:(UITapGestureRecognizer *)gestureRecognizer{
        NSLog(@"setScrollEnabled");
        isNewPINShow = NO;
        if(!isNewPINShow)
        {
           // [[self scrollview] setContentOffset:self.scrollview.contentOffset animated:NO];
            _tfNewPIN.hidden = NO;
            _tfConfirmNewPIN.hidden = NO;
            isNewPINShow = YES;


        [UIView animateWithDuration:0.5 animations:^{

            _tfConfirmNewPIN.frame = CGRectMake(306, 197, 292, 30);
            _tfNewPIN.frame = CGRectMake(306, 245, 292, 30);

            CGRect tempFrame = [_tfEmail frame];
            tempFrame.origin.y  = tempFrame.origin.y + 100;
            _tfEmail.frame = tempFrame;                

            tempFrame = [_tfLanguage frame];
            tempFrame.origin.y  = tempFrame.origin.y + 100;
            _tfLanguage.frame = tempFrame;

            tempFrame = [_tfSecretQuestion frame];
            tempFrame.origin.y  = tempFrame.origin.y + 100;
            _tfSecretQuestion.frame = tempFrame;

            tempFrame = [_tfSecretAnswer frame];
            tempFrame.origin.y  = tempFrame.origin.y + 100;
            _tfSecretAnswer.frame = tempFrame;               


        }];
    }
}

Answer 1

只需在 Storyboard的文件检查器中禁用“使用自动布局”即可。