iphone – 活动文本字段上的键盘滚动 – 滚动到视图外？

发布时间：2020-12-15 01:45:10 所属栏目：百科来源：网络整理

导读：我有一个应用程序,其视图具有从视图顶部到视图底部的文本字段.我需要它在编辑底部字段时滚动,以便字段可见,但它似乎无法正常工作. 在Apple docs之后,我将所有代码放入我的程序(清单4-1,4-2),并将scrollView和activeField出口添加到我的头文件并将它们链接到I

我有一个应用程序,其视图具有从视图顶部到视图底部的文本字段.我需要它在编辑底部字段时滚动,以便字段可见,但它似乎无法正常工作.

在Apple docs之后,我将所有代码放入我的程序(清单4-1,4-2),并将scrollView和activeField出口添加到我的头文件并将它们链接到IB.

问题是,当我单击文本字段时,所有文本字段都会退出视图,直到我关闭键盘.它们向下滚动很远(再次,足够远到没有任何字段可见的地方).

有谁知道这个问题可能是由什么造成的？

我将代码放在Apple Docs中,这样您就可以确切地看到我正在使用的代码而无需点击.

//my .h
    IBOutlet UIScrollView *scrollView;
    IBOutlet UITextField *activeField;

//.m
    // Call this method somewhere in your view controller setup code.
    - (void)registerForKeyboardNotifications
    {
        [[NSNotificationCenter defaultCenter] addObserver:self
                selector:@selector(keyboardWasShown:)
                name:UIKeyboardDidShowNotification object:nil];

   [[NSNotificationCenter defaultCenter] addObserver:self
             selector:@selector(keyboardWillBeHidden:)
             name:UIKeyboardWillHideNotification object:nil];

}

// Called when the UIKeyboardDidShowNotification is sent.
- (void)keyboardWasShown:(NSNotification*)aNotification
{
    NSDictionary* info = [aNotification userInfo];
    CGSize kbSize = [[info objectForKey:UIKeyboardFrameBeginUserInfoKey] CGRectValue].size;

    UIEdgeInsets contentInsets = UIEdgeInsetsMake(0.0,0.0,kbSize.height,0.0);
    scrollView.contentInset = contentInsets;
    scrollView.scrollIndicatorInsets = contentInsets;

    // If active text field is hidden by keyboard,scroll it so it's visible
    // Your application might not need or want this behavior.
    CGRect aRect = self.view.frame;
    aRect.size.height -= kbSize.height;
    if (!CGRectContainsPoint(aRect,activeField.frame.origin) ) {
        CGPoint scrollPoint = CGPointMake(0.0,activeField.frame.origin.y-kbSize.height);
        [scrollView setContentOffset:scrollPoint animated:YES];
    }
}

// Called when the UIKeyboardWillHideNotification is sent
- (void)keyboardWillBeHidden:(NSNotification*)aNotification
{
    UIEdgeInsets contentInsets = UIEdgeInsetsZero;
    scrollView.contentInset = contentInsets;
    scrollView.scrollIndicatorInsets = contentInsets;
}
- (void)textFieldDidBeginEditing:(UITextField *)textField
{
    activeField = textField;
}

- (void)textFieldDidEndEditing:(UITextField *)textField
{
    activeField = nil;
}

解决方法

更新：以下答案已过时.现在您可以使用“ TPkeyboardavoiding”库来处理UIScrollView,UITableView&中的所有类型的文本字段操作.还有很多.尝试一下,让我知道是否有人在集成方面有问题.

老答案

无需为此功能注册键盘通知.为了将活动textField屏幕置于键盘上方,您只需要设置UIscrollView的contentOffset两种方法,如下所示：

// called when textField start editting.
- (void)textFieldDidBeginEditing:(UITextField *)textField
{
    activeField = textField;
    [scrollView setContentOffset:CGPointMake(0,textField.center.y-60) animated:YES];
}



// called when click on the retun button.
- (BOOL)textFieldShouldReturn:(UITextField *)textField
{


    NSInteger nextTag = textField.tag + 1;
    // Try to find next responder
    UIResponder *nextResponder = [textField.superview viewWithTag:nextTag];

    if (nextResponder) {
        [scrollview setContentOffset:CGPointMake(0,textField.center.y-60) animated:YES];
        // Found next responder,so set it.
        [nextResponder becomeFirstResponder];
    } else {
        [scrollview setContentOffset:CGPointMake(0,0) animated:YES];
        [textField resignFirstResponder];   
        return YES;
    }

    return NO; 
}

注意：所有TextField都应该有增量标签,如1,2,3等等.并将代表设置为自我.

谢谢,

（编辑：李大同）

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