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2023-03-16 09:00:05

当键盘出现时，如何在开始编辑时使UITextField上移？

使用iOS SDK：

我有一个带UITextFields的UIView，可以启动键盘。我需要它能够：

启动键盘后，允许滚动UIScrollView的内容以查看其他文本字段自动“跳转”（通过向上滚动）或缩短

我知道我需要一个UIScrollView。我已经尝试将UIView的类更改为UIScrollView，但仍然无法上下滚动文本框。

我需要UIView和UIScrollView吗？一个在另一个里面吗？

要自动滚动到活动文本字段，需要执行哪些操作？

理想情况下，尽可能多的组件设置将在Interface Builder中完成。我只想编写需要的代码。

注意：我使用的UIView（或UIScrollView）是由一个选项卡（UITabBar）启动的，它需要正常工作。

我正在添加滚动条，只为键盘出现时使用。尽管不需要它，但我觉得它提供了一个更好的界面，例如，用户可以滚动和更改文本框。

当键盘上下移动时，我可以改变UIScrollView的框架大小。我只是在使用：

-(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
}

然而，这不会自动“向上移动”或将可见区域中的下部文本字段居中，这是我真正想要的。

当前回答

有这么多的解决方案，但我花了几个小时才开始工作。因此，我将此代码放在这里（只需粘贴到项目中，无需进行任何修改）：

@interface RegistrationViewController : UIViewController <UITextFieldDelegate>{
    UITextField* activeField;
    UIScrollView *scrollView;
}
@end

- (void)viewDidLoad
{
    [super viewDidLoad];

    scrollView = [[UIScrollView alloc] initWithFrame:self.view.frame];

    //scrool view must be under main view - swap it
    UIView* natView = self.view;
    [self setView:scrollView];
    [self.view addSubview:natView];

    CGSize scrollViewContentSize = self.view.frame.size;
    [scrollView setContentSize:scrollViewContentSize];

    [self registerForKeyboardNotifications];
}

- (void)viewDidUnload {
    activeField = nil;
    scrollView = nil;
    [self unregisterForKeyboardNotifications];
    [super viewDidUnload];
}

- (void)registerForKeyboardNotifications
{
    [[NSNotificationCenter defaultCenter] addObserver:self
                                             selector:@selector(keyboardWillShown:)
                                                 name:UIKeyboardWillShowNotification object:nil];

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

}

-(void)unregisterForKeyboardNotifications
{
    [[NSNotificationCenter defaultCenter] removeObserver:self
                                                    name:UIKeyboardWillShowNotification
                                                  object:nil];
    // unregister for keyboard notifications while not visible.
    [[NSNotificationCenter defaultCenter] removeObserver:self
                                                    name:UIKeyboardWillHideNotification
                                                  object:nil];
}

- (void)keyboardWillShown:(NSNotification*)aNotification
{
    NSDictionary* info = [aNotification userInfo];
    CGSize kbSize = [[info objectForKey:UIKeyboardFrameBeginUserInfoKey] CGRectValue].size;

    CGRect frame = self.view.frame;
    frame.size.height -= kbSize.height;
    CGPoint fOrigin = activeField.frame.origin;
    fOrigin.y -= scrollView.contentOffset.y;
    fOrigin.y += activeField.frame.size.height;
    if (!CGRectContainsPoint(frame, fOrigin) ) {
        CGPoint scrollPoint = CGPointMake(0.0, activeField.frame.origin.y + activeField.frame.size.height - frame.size.height);
        [scrollView setContentOffset:scrollPoint animated:YES];
    }
}

- (void)keyboardWillBeHidden:(NSNotification*)aNotification
{
     [scrollView setContentOffset:CGPointZero animated:YES];
}

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

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

-(BOOL) textFieldShouldReturn:(UITextField *)textField
{
    [textField resignFirstResponder];
    return YES;
}

P.S：我希望这段代码能帮助某人快速达到预期效果。（Xcode 4.5）

2012-10-12 09:14:14

其他回答

试试这个小把戏。

- (void)textFieldDidBeginEditing:(UITextField *)textField
{
    [self animateTextField: textField up: YES];
}

- (void)textFieldDidEndEditing:(UITextField *)textField
{
    [self animateTextField: textField up: NO];
}

- (void) animateTextField: (UITextField*) textField up: (BOOL) up
{
    const int movementDistance = textField.frame.origin.y / 2; // tweak as needed
    const float movementDuration = 0.3f; // tweak as needed

    int movement = (up ? -movementDistance : movementDistance);

    [UIView beginAnimations: @"anim" context: nil];
    [UIView setAnimationBeginsFromCurrentState: YES];
    [UIView setAnimationDuration: movementDuration];
    self.view.frame = CGRectOffset(self.view.frame, 0, movement);
    [UIView commitAnimations];
}
2015-05-11 13:32:32

这段代码将根据键盘高度和文本字段的深度来计算需要向上移动多少。记住在头中添加委托并继承UITextFieldDelegate。

- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{
    [_tbxUsername resignFirstResponder];
    [_tbxPassword resignFirstResponder];
}

- (void)textFieldDidBeginEditing:(UITextField *) textField
{
    [self animateTextField:textField up:YES];
}

- (void)textFieldDidEndEditing:(UITextField *) textField
{
    [self animateTextField:textField up:NO];
}

- (void) animateTextField: (UITextField*) textField up: (BOOL) up
{
    int animatedDistance;
    int moveUpValue = textField.frame.origin.y+ textField.frame.size.height;
    UIInterfaceOrientation orientation =
    [[UIApplication sharedApplication] statusBarOrientation];
    if (orientation == UIInterfaceOrientationPortrait ||
        orientation == UIInterfaceOrientationPortraitUpsideDown)
    {

        animatedDistance = 236-(460-moveUpValue-5);
    }
    else
    {
        animatedDistance = 182-(320-moveUpValue-5);
    }

    if(animatedDistance>0)
    {
        const int movementDistance = animatedDistance;
        const float movementDuration = 0.3f;
        int movement = (up ? -movementDistance : movementDistance);
        [UIView beginAnimations: nil context: nil];
        [UIView setAnimationBeginsFromCurrentState: YES];
        [UIView setAnimationDuration: movementDuration];
        self.view.frame = CGRectOffset(self.view.frame, 0, movement);
        [UIView commitAnimations];
    }
}

要在ViewDidLoad中添加的委托

_tbxUsername.delegate = self;
_tbxPassword.delegate = self;
2016-07-08 09:23:44

在视图中设置滚动视图

  - (void)textFieldDidBeginEditing:(UITextField *)textField
    {
     CGPoint point;
    if(textField == txtEmail){
      // -90 is for my you can change as per your postion
      point = CGPointMake(0, textField.frame.origin.y - 90);
    }
    else if (textField == txtContact){
      point = CGPointMake(0, textField.frame.origin.y - 90);
    }
      [scrollV setContentOffset:point animated:YES];
    }
2016-09-07 05:41:38

我把所有的东西都放在一节课上。加载视图控制器时，只需调用以下代码行：

- (void)viewDidLoad {
    [super viewDidLoad];
    KeyboardInsetScrollView *injectView = [[KeyboardInsetScrollView alloc] init];
    [injectView injectToView:self.view withRootView:self.view];
}

以下是示例项目的链接：https://github.com/caohuuloc/KeyboardInsetScrollView

2015-05-06 07:33:16

Swift 2.0版本：

添加UIScrollView并在其顶部添加textFields。将故事板引用到VC。

@IBOutlet weak var username: UITextField!
@IBOutlet weak var password: UITextField!
@IBOutlet weak var scrollView: UIScrollView!

添加以下方法：UITextFieldDelegate和UIScrollViewDelegate。

//MARK:- TEXTFIELD METHODS
    func textFieldShouldReturn(textField: UITextField) -> Bool {

        if(username.returnKeyType == UIReturnKeyType.Default) {
            password.becomeFirstResponder()
        }
        textField.resignFirstResponder()
        return true
    }
    func textFieldDidBeginEditing(textField: UITextField) {

        dispatch_async(dispatch_get_main_queue()) {

            let scrollPoint:CGPoint = CGPointMake(0,textField.frame.origin.y/4)
            self.scrollView!.setContentOffset(scrollPoint, animated: true);
        }
    }
    func textFieldShouldEndEditing(textField: UITextField) -> Bool {

        dispatch_async(dispatch_get_main_queue()) {
          UIView.animateWithDuration(0, animations: { self.scrollView!.setContentOffset(CGPointZero,animated: true) })
        }
        return true
    }
    override func touchesBegan(touches: Set<UITouch>,
        withEvent event: UIEvent?) {
            self.view.endEditing(true)
    }
    func scrollViewWillBeginDragging(scrollView: UIScrollView) {
        self.scrollView.scrollEnabled =  true

        dispatch_async(dispatch_get_main_queue()) {
            UIView.animateWithDuration(0, animations: { self.scrollView!.setContentOffset(CGPointZero,animated: true)

            })
        }
    }
2016-02-16 08:58:08

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