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

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)

            })
        }
    }

其他回答

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)

            })
        }
    }

非常轻量级的解决方案可以使用KeyboardAnimator。

项目获得了示例实现,文档编制仍在进行中。。。

适当用法:它具有UITextField和UITextView的特定实现

限制::它完全基于objective-c,swift版本将很快推出。

如果文本字段未完全或部分隐藏,则我们不应更改任何内容。我们应该计算隐藏的精确相交区域(键盘的框架和文本字段的框架),然后我们应该更改视图的框架。这里我给出了一个完整的例子。声明3个变量

#定义衬垫10@接口PKViewController()@属性(非原子,赋值)CGRect-originalViewFrame//原始视图的框架@属性(非原子,强)UITextField*activeTextField;//当前文本字段@属性(非原子,赋值)CGRect keyBoardRect;//安全板覆盖面积@完

存储原始帧

- (void)viewDidLoad {
    [super viewDidLoad];
    _originalViewFrame = self.view.frame;
}

将视图控制器添加为键盘通知的观察者

- (void)viewWillAppear:(BOOL)animated{
    [super viewWillAppear:animated];
    [[NSNotificationCenter defaultCenter] addObserver:self
                                             selector:@selector(keyboardWasShown:)
                                                 name:UIKeyboardDidShowNotification
                                               object:nil];
    [[NSNotificationCenter defaultCenter] addObserver:self
                                             selector:@selector(keyboardWillHide:)
                                                 name:UIKeyboardWillHideNotification
                                               object:nil];
}

移除观察者

- (void)viewWillDisappear:(BOOL)animated{
    [super viewWillDisappear:animated];
    [[NSNotificationCenter defaultCenter] removeObserver:self];
}

当键盘出现时存储键盘覆盖的区域,当键盘消失时将其设置为CGRectZero

- (void)keyboardWasShown:(NSNotification *)notification{
    CGSize keyboardSize = [[[notification userInfo] objectForKey:UIKeyboardFrameBeginUserInfoKey] CGRectValue].size;
    _keyBoardRect = CGRectMake(0, _originalViewFrame.size.height - keyboardSize.height, keyboardSize.width, keyboardSize.height);
    [self moveTextFieldUP];

}
- (void) keyboardWillHide:(NSNotification *)notification{
    _keyBoardRect = CGRectZero;
    [self setDefaultFrame];
}

存储活动文本字段

- (BOOL)textFieldShouldBeginEditing:(UITextField *)textField {
    _activeTextField = textField;
//When keyboard is already present but the textfield is hidden. Case:When return key of  keyboard makes the next textfield as first responder
    if (!CGRectIsEmpty(_keyBoardRect)) { 
        [self moveTextFieldUP];
    }
    return YES;
}
- (BOOL)textFieldShouldReturn:(UITextField *)textField{
    [textField resignFirstResponder];
    return YES;
}

现在我们应该改变视图的框架

- (void)moveTextFieldUP{
    CGRect virtualTextFieldRect = CGRectMake(0, self.view.frame.origin.y, _activeTextField.frame.size.width, _activeTextField.frame.origin.y+_activeTextField.frame.size.height);
    if (CGRectIntersectsRect(_keyBoardRect, virtualTextFieldRect)) {
        CGRect intersectRect = CGRectIntersection(_keyBoardRect, virtualTextFieldRect);
        CGFloat newY = _originalViewFrame.origin.y - intersectRect.size.height;
        CGFloat newHeight = _originalViewFrame.size.height + intersectRect.size.height;
        CGRect newFrame = CGRectMake(0, newY-PADDING, _originalViewFrame.size.width, newHeight+PADDING);
        [UIView animateWithDuration:0.3 animations:^{
            [self.view setFrame:newFrame];
        }];

        NSLog(@"Intersect");
    }
}
- (void)setDefaultFrame {
    [UIView animateWithDuration:0.3 animations:^{
        [self.view setFrame:_originalViewFrame];
    }];
}

使用这个第三方,你甚至不需要写一行

https://github.com/hackiftekhar/IQKeyboardManager

下载项目并在项目中拖放IQKeyboardManager。如果您发现任何问题,请阅读README文档。

伙计们管理键盘真的很头疼。

一个适用于许多UITextFields的小补丁:

#pragma mark UIKeyboard handling

#define kMin 150

-(void)textFieldDidBeginEditing:(UITextField *)sender
{
    if (currTextField) {
        [currTextField release];
    }
    currTextField = [sender retain];
    // Move the main view, so that the keyboard does not hide it.
    if (self.view.frame.origin.y + currTextField.frame.origin. y >= kMin) {
        [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 = kMin - currTextField.frame.origin.y ;
    }
    else
    {
        // Revert back to the normal state.
        rect.origin.y = 0;
    }
    self.view.frame = rect;

    [UIView commitAnimations];
}


- (void)keyboardWillShow:(NSNotification *)notif
{
    // Keyboard will be shown now. Depending on which textfield is active, move up or move down the view appropriately

    if ([currTextField isFirstResponder] && currTextField.frame.origin.y + self.view.frame.origin.y >= kMin)
    {
        [self setViewMovedUp:YES];
    }
    else if (![currTextField isFirstResponder] && currTextField.frame.origin.y + self.view.frame.origin.y < kMin)
    {
        [self setViewMovedUp:NO];
    }
}


- (void)keyboardWillHide:(NSNotification *)notif
{
    // Keyboard will be shown now. Depending on which textfield is active, move up or move down the view appropriately
    if (self.view.frame.origin.y < 0 ) {
        [self setViewMovedUp:NO];
    }
}


- (void)viewWillAppear:(BOOL)animated
{
    // Register for keyboard notifications
    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardWillShow:)
                                                 name:UIKeyboardWillShowNotification object:self.view.window];
    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardWillHide:)
                                                 name:UIKeyboardWillHideNotification object:self.view.window];
}

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