6

我有一个 UIScrollView，其中有一个 UITextField，所以我所做的是在第三个文本字段（即密码）上向下滚动 UIScrollView 的偏移量：

#pragma mark UITextFieldDelegate
- (void)textFieldDidBeginEditing:(UITextField *)textField
{
    if ((textField == self.emailTextField_ || textField == self.passwordTextField_)){
        if (self.scrollView_.contentOffset.y != self.emailTextField_.frameY - self.emailTextField_.frameHeight/2){
            shouldAdjustOffset = YES;
        } else {
            shouldAdjustOffset = NO;
        }

        if (shouldAdjustOffset){
            [self.scrollView_ setContentOffset:CGPointMake(0, self.emailTextField_.frameY - self.emailTextField_.frameHeight/2) animated:YES];
        }
    }
}

-(BOOL) textFieldShouldReturn:(UITextField *)textField
{
    if (textField == self.firstNameTexField_){
        [self.firstNameTexField_ resignFirstResponder];
        [self.lastNameTextField_ becomeFirstResponder];
    } else if (textField == self.lastNameTextField_){
        [self.lastNameTextField_ resignFirstResponder];
        [self.emailTextField_ becomeFirstResponder];
    } else if (textField == self.emailTextField_){
        [self.emailTextField_ resignFirstResponder];
        [self.passwordTextField_ becomeFirstResponder];
    } else if (textField == self.passwordTextField_){
        [self signupButtonPressed:nil];
        [self.passwordTextField_ resignFirstResponder];
    }

    return YES;
}

现在的问题是，当我在下一个文本字段中时，它会将内容偏移量重置回 0，当我这样做时：

 [self.emailTextField_ resignFirstResponder];
        [self.passwordTextField_ becomeFirstResponder];

. 我怎样才能防止这种情况发生？

4

2 回答 2

3

只需在显示键盘（成为FirstResponder）之前打开滚动视图滚动并启用它之后的滚动，

scrollView.scrollEnabled = NO;
[someControl becomeFirstResponder];
scrollView.scrollEnabled = YES;
[scrollview doTheScrollingHere];
于 2012-11-06T12:46:01.070 回答
0

@Deepan，您为我节省了很多时间:) 只有我建议的是覆盖UITextField方法becomeFirstResponder以首先检查它是否在UIScrollView中以及是否暂时禁用滚动

- (BOOL)becomeFirstResponder
{
    if ([self.superview isKindOfClass:[UIScrollView class]])
    {
        [(UIScrollView*)self.superview setScrollEnabled:NO];
    }

    BOOL accept = [super becomeFirstResponder];

    if ([self.superview isKindOfClass:[UIScrollView class]])
    {
        [(UIScrollView*)self.superview setScrollEnabled:YES];
    }

    return accept
}
于 2015-02-19T10:35:39.133 回答