Question

在我的应用程序中我有8个文本字段。当键盘出现时我已经实现了scrollview，但是当我开始在第一个文本字段中输入文本时，视图会滚动并隐藏我当前聚焦的文本字段。我希望滚动应该发生在我在某个特定的文本字段中输入文本时，假设从第5个开始。我怎么能这样做。

Answer 1

使用NSNotifications了解键盘的高度：

[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(showKeyboardEditProfile) name:UIKeyboardWillShowNotification object:nil];

然后实现此功能以获得键盘的高度：

-(void)showKeyBoard:(NSNotification *)notification
{

NSDictionary *info=[notification userInfo];
 keyboardSize=[[info objectForKey:UIKeyboardFrameBeginUserInfoKey] CGRectValue].size;

}

这将为您提供键盘的大小。

现在使用文本字段的标签按其外观的递增顺序设置，并将视图控制器设置为其委托。

然后使用此委托方法设置scrollView的contentOffset：

- (void)textFieldDidBeginEditing:(UITextField *)textField { 
}

Answer 2

嗨我已经使用了很长时间的代码，它对scrollview和tableview非常有用

#pragma mark
#pragma mark - text field delegate method
-(void)textFieldDidBeginEditing:(UITextField *)textField
{
    [self showKeyBoard:YES];
    [self setTableOffsetForTextField:textField];
}
-(BOOL)textFieldShouldReturn:(UITextField *)textField
{
    [textField resignFirstResponder];
    [self.view endEditing:YES];
    [self showKeyBoard:NO];
    return YES;
}
#pragma mark - Show Hide Key Board
- (void)showKeyBoard:(BOOL)boolValue
{
    scrollView.contentInset = UIEdgeInsetsMake(0, 0, boolValue ? ([self kbHeight1]) : 0.0, 0.0);
}


- (CGFloat)kbHeight1
{
    if (UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiomPad) {

        UIInterfaceOrientation orientation = [UIApplication sharedApplication].statusBarOrientation;

        if (orientation == UIInterfaceOrientationPortrait || orientation == UIInterfaceOrientationPortraitUpsideDown) {
            return 264.0;
        }
        else
        {
            return 352.0;
        }
    }
    else
    {
        return 216.0;
    }

}
- (void)setTableOffsetForTextField:(UIView *)textField
{

    UIInterfaceOrientation orientation = [UIApplication sharedApplication].statusBarOrientation;

    if (UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiomPad && (orientation == UIInterfaceOrientationPortrait || orientation == UIInterfaceOrientationPortraitUpsideDown)){

        return;
    }


    CGPoint point = [textField convertPoint:textField.frame.origin toView:scrollView];
    CGFloat diff = [self difference];
    CGFloat pos = (point.y - diff);
    if (pos < 0 || pos > scrollView.contentSize.height - diff) {
        pos = 0;
    }
    [scrollView setContentOffset:CGPointMake(0, pos) animated:YES];
}


-(CGFloat)difference{
    CGSize screenSize = self.view.frame.size;

    CGFloat diff;
    if (UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiomPad) {

        diff = (screenSize.height > 768) ? 264.0 : 250;

    }
    else
    {
        diff = (screenSize.height == 480) ? 120.0 : 70.0;        
    }
    return diff;
}

这可能对你有所帮助。

Answer 3

您可以使用标签来完成。

为8个文本字段将标记添加到1-8文本字段。检查文本字段的标记值是否等于或大于5，然后仅应用您的scrollview else return;

- (void)textFieldDidBeginEditing:(UITextField *)textField {
    if(textField.tag==5 || textField.tag>=5)
       {
       //Implement scrollview here
       }
}

希望它可以帮助你......！

针对特定案例在ios中实现滚动视图

3 个答案: