becomeFirstResponder重置contentOffset

Question

我有一个UIScrollView，其中我有一个UITextField，所以我做的是在第三个文本字段，即密码，我向下滚动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时，它将内容偏移重置为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？

Answer 1

在显示键盘之前，只需转动滚动视图滚动（becomeFirstResponder）并在其后启用滚动，

scrollView.scrollEnabled = NO;
[someControl becomeFirstResponder];
scrollView.scrollEnabled = YES;
[scrollview doTheScrollingHere];

Answer 2

@Deepan你节省了我很多时间:)只有我建议的是覆盖 UITextField 方法 becomeFirstResponder 来检查如果它在 UIScrollView 中，如果禁用滚动片刻

- (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
}