如果你还在为这件事而挣扎，请阅读我的帖子

我今天提出了一个解决方案。我读过很多关于这个问题的帖子和“教程”，没有一篇在任何情况下都有效（大多数都是相互复制粘贴的）。甚至苹果官方提出的“解决方案”也不起作用，更重要的是，它在横向模式下完全不起作用。苹果公司没有给开发者们解决这样一个常见的基本问题的方法，真是可耻。非常不专业。如此惊人的框架（Cocoa）和如此严重的被低估的问题。

现在，我的解决方案是：让UIScrollView成为您的根视图，然后将所有内容放入其中。然后从这个KeyboardAwareController类子类化视图控制器（您可能需要重新定义scrollView和keyboardPadding方法）：

////键盘AwareController.h//社会病////管理员于2014年1月13日创建。//版权所有（c）2014 kuchumovn。保留所有权利。//

#import <UIKit/UIKit.h>

@interface KeyboardAwareController : UIViewController <UITextFieldDelegate>

@end

////键盘AwareController.m//社会病////管理员于2014年1月13日创建。//版权所有（c）2014 kuchumovn。保留所有权利。//

#import "KeyboardAwareController.h"

@interface KeyboardAwareController ()

@end

@implementation KeyboardAwareController
{
    CGPoint scrollPositionBeforeKeyboardAdjustments;

    __weak UIScrollView* scrollView;

    UITextField* activeField;
}

- (id) initWithCoder: (NSCoder*) decoder
{
    if (self = [super initWithCoder:decoder])
    {
        scrollPositionBeforeKeyboardAdjustments = CGPointZero;
    }
    return self;
}

- (void) viewDidLoad
{
    [super viewDidLoad];
}

- (UIScrollView*) scrollView
{
    return (UIScrollView*) self.view;
}

- (CGFloat) keyboardPadding
{
    return 5;
}

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

    [[NSNotificationCenter defaultCenter] addObserver:self
                                             selector:@selector(keyboardDidShow:)
                                                 name:UIKeyboardDidShowNotification object:nil];

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

- (void) deregisterFromKeyboardNotifications
{
    [[NSNotificationCenter defaultCenter] removeObserver:self
                                                    name:UIKeyboardWillShowNotification
                                                  object:nil];

    [[NSNotificationCenter defaultCenter] removeObserver:self
                                                    name:UIKeyboardDidShowNotification
                                                  object:nil];

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

- (void) viewWillAppear: (BOOL) animated
{
    [super viewWillAppear:animated];

    [self registerForKeyboardNotifications];
}

- (void) viewWillDisappear: (BOOL) animated
{
    [self deregisterFromKeyboardNotifications];

    [super viewWillDisappear:animated];
}

- (void) keyboardWillShow: (NSNotification*) notification
{
    //NSLog(@"keyboardWillShow");

    // force the animation from keyboardWillBeHidden: to end
    scrollView.contentOffset = scrollPositionBeforeKeyboardAdjustments;

    scrollPositionBeforeKeyboardAdjustments = CGPointZero;
}

// warning: i have no idea why this thing works and what does every line of this code mean
// (but it works and there is no other solution on the internets whatsoever)
// P.S. Shame on Apple for missing such a basic functionality from SDK (and many other basic features we have to hack and mess around with for days and nights)

- (void) keyboardDidShow: (NSNotification*) notification
{
    //NSLog(@"keyboardDidShow");

    UIWindow* window = [[[UIApplication sharedApplication] windows]objectAtIndex:0];
    UIView* mainSubviewOfWindow = window.rootViewController.view;

    CGRect keyboardFrameIncorrect = [[[notification userInfo] objectForKey:UIKeyboardFrameEndUserInfoKey] CGRectValue];
    CGRect keyboardFrame = [mainSubviewOfWindow convertRect:keyboardFrameIncorrect fromView:window];
    CGSize keyboardSize = keyboardFrame.size;

    CGRect visibleFrame = CGRectMake(0, 0, 0, 0);
    visibleFrame.origin = self.scrollView.contentOffset;
    visibleFrame.size = self.scrollView.bounds.size;

    CGFloat paddedKeyboardHeight = keyboardSize.height + self.keyboardPadding;

    //NSLog(@"visibleFrame %@", NSStringFromCGRect(visibleFrame));

    visibleFrame.size.height -= paddedKeyboardHeight;

    //NSLog(@"visibleFrame after keyboard height %@", NSStringFromCGRect(visibleFrame));

    if (CGRectContainsPoint(visibleFrame, activeField.frame.origin))
        return;

    scrollPositionBeforeKeyboardAdjustments = scrollView.contentOffset;

    UIEdgeInsets contentInsets = UIEdgeInsetsMake(0.0, 0.0, activeField.frame.origin.y - visibleFrame.size.height + activeField.frame.size.height, 0);

    contentInsets = UIEdgeInsetsMake(0.0, 0.0, paddedKeyboardHeight, 0);

    self.scrollView.contentInset = contentInsets;
    self.scrollView.scrollIndicatorInsets = contentInsets;

    CGSize scrollContentSize = self.scrollView.bounds.size;
    scrollContentSize.height += paddedKeyboardHeight;
    self.scrollView.contentSize = scrollContentSize;

    //NSLog(@"scrollView %@", NSStringFromCGRect(scrollView.frame));
    //NSLog(@"activeField %@", NSStringFromCGRect(activeField.frame));

    //[scrollView scrollRectToVisible:activeField.frame animated:YES];

    CGPoint scrollPoint = CGPointMake(0.0, activeField.frame.origin.y - visibleFrame.size.height + activeField.frame.size.height);

    //NSLog(@"scrollPoint %@", NSStringFromCGPoint(scrollPoint));

    [self.scrollView setContentOffset:scrollPoint animated:YES];
}

- (void) keyboardWillBeHidden: (NSNotification*) notification
{
    //NSLog(@"keyboardWillBeHidden");

    UIEdgeInsets contentInsets = UIEdgeInsetsZero;

    // this doesn't work when changing orientation while the keyboard is visible
    // because when keyboardDidShow: will be called right after this method the contentOffset will still be equal to the old value
    //[scrollView setContentOffset:scrollPositionBeforeKeyboardAdjustments animated:YES];

    [UIView animateWithDuration:.25 animations:^
    {
        self.scrollView.contentInset = contentInsets;
        self.scrollView.scrollIndicatorInsets = contentInsets;

        // replacement for setContentOffset:animated:
        self.scrollView.contentOffset = scrollPositionBeforeKeyboardAdjustments;
    }];
}

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

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

如果您有任何问题，我的项目将在github上托管：https://github.com/kuchumovn/sociopathy.ios

为了更好地解释，我还拍了一张截图：

RPDP的代码成功地将文本字段移出键盘。但是当你在使用和关闭键盘后滚动到顶部时，顶部已经从视图中向上滚动。模拟器和设备都是如此。要读取该视图顶部的内容，必须重新加载该视图。

他下面的代码难道不应该使视图降低吗？

else
{
    // revert back to the normal state.
    rect.origin.y += kOFFSET_FOR_KEYBOARD;
    rect.size.height -= kOFFSET_FOR_KEYBOARD;
}

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

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()
    }

}

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];
}

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)

            })
        }
    }