刚找到这个类：

https://github.com/OliverLetterer/SLScrollViewKeyboardSupport

到目前为止，它在iPhone上运行得很好，包括动画和正确的偏移。

要使用它，只需添加到viewDidLoad：

self.support = [[SLScrollViewKeyboardSupport alloc] initWithScrollView:self.scrollView];

要恢复到原始视图状态，请添加：

-(void)textFieldDidEndEditing:(UITextField *)sender

{
    //move the main view, so that the keyboard does not hide it.
    if  (self.view.frame.origin.y < 0)
    {
        [self setViewMovedUp:NO];
    }
}

我想延长@sumanthkodi的回答。

正如一些人所说，他的方法在较新的实现中不起作用，因为当您使用约束时，UIView无法移动。

我编辑了如下代码（并移植到Swift 2.0），希望它能帮助一些人：

1） 参照要向上移动的视图的垂直约束：

@IBOutlet var viewConstraint: NSLayoutConstraint!

确保在脚本中使用约束引用此变量。

2） 添加委托并实现侦听器。这是与之前相同的实现：

class YourViewController: UIViewController, UITextFieldDelegate {

    ...

    func textFieldDidBeginEditing(textField: UITextField) {
        animateTextField(textField, up: true)
    }

    func textFieldDidEndEditing(textField: UITextField) {
        animateTextField(textField, up: false)
    }

    ...

}

3） 将动画方法animateTextField添加到YourViewController类。根据需要设置临时约束值。

func animateTextField(textfield: UITextField, up: Bool) {

    let originalConstraint = 50
    let temporaryConstraint = 0
    let movementDuration = 0.3

    let constraint = CGFloat(up ? temporaryConstraint : originalConstraint)

    containerViewConstraint.constant = constraint
    UIView.animateWithDuration(movementDuration) {
        self.view.layoutIfNeeded()
    }

}

使用IQKeyboardManager，出现键盘时，UITextField和UITextView会自动滚动。Git链接：https://github.com/hackiftekhar/IQKeyboardManager.

豆荚：pod“IQKeyboardManager”#iOS8及更高版本

吊舱“IQKeyboardManager”，“3.3.7”#iOS7

您不需要为一个简单的任务编写这么多代码。有一个名为“IQKeyboardManager”的CocoaPod将为您完成任务：

pod 'IQKeyboardManager'

然后在从didFinishLaunchingWithOptions返回之前，在AppDelegate中使用以下代码：

IQKeyboardManager.shared().isEnabled = true
IQKeyboardManager.shared().shouldResignOnTouchOutside = true
IQKeyboardManager.shared().isEnableAutoToolbar = false

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];
}