PROSAGA码农传奇-IOS-当有键盘时如何在开始编辑时如何使UITextField向上移动？

当有键盘时如何在开始编辑时如何使UITextField向上移动？

作者: 狗头军师
发布时间: 2025-12-19 10:55:52 (2月前)

使用iOS SDK：我有一个UIView带有UITextFields的键盘。我需要它能够：UIScrollView提起键盘后，允许滚动的内容以查看其他文本字段自动“跳跃”（通过向上滚动）或缩短我知道我需要一个UIScrollView。我尝试将我的类更改UIView为a，UIScrollView但是仍然无法向上或向下滚动文本框。我需要a UIView和a UIScrollView吗？一个人会进入另一个人吗？为了自动滚动到活动文本字段，需要执行哪些操作？理想情况下，将在Interface Builder中完成尽可能多的组件设置。我只想编写所需的代码。注意：我正在使用的UIView（或UIScrollView）由标签栏（UITabBar）调出，该标签栏需要正常运行。编辑：我只是在键盘出现时添加滚动条。即使不需要它，我也觉得它提供了一个更好的界面，因为例如，用户可以滚动和更改文本框。UIScrollView当键盘上下移动时，我可以在更改框架大小的地方使用它。我只是在使用：
<pre><code>-(void)textFieldDidBeginEditing:(UITextField *)textField { 
 //Keyboard becomes visible
 scrollView.frame = CGRectMake(scrollView.frame.origin.x, 
 scrollView.frame.origin.y, 
scrollView.frame.size.width,
scrollView.frame.size.height - 215 + 50); //resize
}

-(void)textFieldDidEndEditing:(UITextField *)textField {
 //keyboard will hide
 scrollView.frame = CGRectMake(scrollView.frame.origin.x, 
 scrollView.frame.origin.y, 
 scrollView.frame.size.width,
 scrollView.frame.size.height + 215 - 50); //resize
}
</code></pre>但是，这不会自动“向上移动”或将下部文本字段居中显示区域的中心，这是我真正想要的。

ScrollView如果您现在拥有的内容不适合iPhone屏幕，则只需要a 。（如果要添加ScrollView组件作为组件的超级视图只是为了在TextField出现键盘时向上滚动，则不需要。）

防止TextFields覆盖键盘的标准方法是在显示键盘时上下移动视图。

这是一些示例代码：

```
#define kOFFSET_FOR_KEYBOARD 80.0

-(void)keyboardWillShow {
 // Animate the current view out of the way
 if (self.view.frame.origin.y >= 0)
 {
 [self setViewMovedUp:YES];
 }
 else if (self.view.frame.origin.y < 0)
 {
 [self setViewMovedUp:NO];
 }
}

-(void)keyboardWillHide {
 if (self.view.frame.origin.y >= 0)
 {
 [self setViewMovedUp:YES];
 }
 else if (self.view.frame.origin.y < 0)
 {
 [self setViewMovedUp:NO];
 }
}

-(void)textFieldDidBeginEditing:(UITextField *)sender
{
    if ([sender isEqual:mailTf])
    {
        //move the main view, so that the keyboard does not hide it.
        if  (self.view.frame.origin.y >= 0)
        {
            [self setViewMovedUp:YES];
        }
    }
}

//method to move the view up/down whenever the keyboard is shown/dismissed
-(void)setViewMovedUp:(BOOL)movedUp
{
    [UIView beginAnimations:nil context:NULL];
    [UIView setAnimationDuration:0.3]; // if you want to slide up the view

CGRect rect = self.view.frame;
    if (movedUp)
    {
        // 1. move the view's origin up so that the text field that will be hidden come above the keyboard 
        // 2. increase the size of the view so that the area behind the keyboard is covered up.
        rect.origin.y -= kOFFSET_FOR_KEYBOARD;
        rect.size.height += kOFFSET_FOR_KEYBOARD;
    }
    else
    {
        // revert back to the normal state.
        rect.origin.y += kOFFSET_FOR_KEYBOARD;
        rect.size.height -= kOFFSET_FOR_KEYBOARD;
    }
    self.view.frame = rect;

[UIView commitAnimations];
}

- (void)viewWillAppear:(BOOL)animated
{
    [super viewWillAppear:animated];
    // register for keyboard notifications
    [[NSNotificationCenter defaultCenter] addObserver:self
                                         selector:@selector(keyboardWillShow)
                                             name:UIKeyboardWillShowNotification
                                           object:nil];

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

- (void)viewWillDisappear:(BOOL)animated
{
    [super viewWillDisappear:animated];
    // unregister for keyboard notifications while not visible.
    [[NSNotificationCenter defaultCenter] removeObserver:self
                                             name:UIKeyboardWillShowNotification
                                           object:nil];

[[NSNotificationCenter defaultCenter] removeObserver:self
                                             name:UIKeyboardWillHideNotification
                                           object:nil];
}
```