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

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];
    }];
}

其他回答

这可以通过以下代码行使用约束简单地实现

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

- (void)keyboardWillShow:(NSNotification *)notification {
    [self adjustTextViewByKeyboardState:YES keyboardInfo:[notification userInfo]];
}

- (void)keyboardWillHide:(NSNotification *)notification {
    [self adjustTextViewByKeyboardState:NO keyboardInfo:[notification userInfo]];
}

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

- (void)adjustTextViewByKeyboardState:(BOOL)showKeyboard keyboardInfo:(NSDictionary *)info {
    CGRect keyboardFrame = [[info objectForKey:UIKeyboardFrameEndUserInfoKey] CGRectValue];
    CGFloat height = keyboardFrame.size.height;
    self.constraintToAdjust.constant = height;        UIViewAnimationCurve animationCurve = [info[UIKeyboardAnimationCurveUserInfoKey] unsignedIntegerValue];
    UIViewAnimationOptions animationOptions = UIViewAnimationOptionBeginFromCurrentState;
    if (animationCurve == UIViewAnimationCurveEaseIn) {
        animationOptions |= UIViewAnimationOptionCurveEaseIn;
    }
    else if (animationCurve == UIViewAnimationCurveEaseInOut) {
        animationOptions |= UIViewAnimationOptionCurveEaseInOut;
    }
    else if (animationCurve == UIViewAnimationCurveEaseOut) {
        animationOptions |= UIViewAnimationOptionCurveEaseOut;
    }
    else if (animationCurve == UIViewAnimationCurveLinear) {
        animationOptions |= UIViewAnimationOptionCurveLinear;
    }
    [UIView animateWithDuration:[[info objectForKey:UIKeyboardAnimationDurationUserInfoKey] doubleValue] delay:0 options:animationOptions animations:^{
        [self.view layoutIfNeeded];
    }                completion:nil];
}

Shiun表示:“事实证明,我相信UIScrollView实际上隐式地将当前编辑的UITextField带入可视窗口。”这似乎适用于iOS 3.1.3,但不适用于3.2、4.0或4.1。为了使UITextField在iOS上可见,我必须添加一个显式的scrollRectToVisible。

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];
    }];
}

我已经组装了一个通用的UIScrollView、UITableView甚至UICollectionView子类,它负责将其中的所有文本字段移到键盘之外。

当键盘即将出现时,子类将找到即将被编辑的子视图,并调整其框架和内容偏移,以确保该视图可见,并使用与键盘弹出窗口匹配的动画。当键盘消失时,它会恢复原来的大小。

它基本上可以与任何设置一起使用,无论是基于UITableView的界面,还是由手动放置的视图组成的界面。

这里是:将文本字段移出键盘的解决方案

找到最简单的解决方案

- (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 = 80; // 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];
}