Xcode/iOS5：当键盘出现时，向上移动 UIView

Question

我想在显示键盘时向上移动视图。键盘（高度：216）应该用它的高度推高我的视野。这可以通过简单的代码实现吗？

Answer 1

要移动视图up，只需更改其center。首先，将原始的保留在 CGPoint 属性中。

- (void)viewDidLoad 
{
    ...
    self.originalCenter = self.view.center;
    ...
}

然后，当键盘出现时根据需要进行更改：

self.view.center = CGPointMake(self.originalCenter.x, /* new calculated y */);

最后，在键盘隐藏时恢复：

self.view.center = self.originalCenter;

随意添加动画糖

知道键盘何时出现的方法不止一种。

观察 UIKeyboardDidShowNotification 通知。

/* register notification in any of your initWithNibName:bundle:, viewDidLoad, awakeFromNib, etc. */
{
    ...
    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardDidShow:) name:UIKeyboardDidShowNotification object:nil];     
    ...
}

- (void)keyboardDidShow:(NSNotification *)note 
{
    /* move your views here */
}

用UIKeyboardDidHideNotification做相反的事情。

-或-

实现 UITextFieldDelegate

在编辑开始/结束时检测以移动视图。

- (void)textFieldDidBeginEditing:(UITextField *)textField 
{
    /* keyboard is visible, move views */
}

- (void)textFieldDidEndEditing:(UITextField *)textField
{
    /* resign first responder, hide keyboard, move views */
}

根据您可能需要跟踪用户正在编辑哪个字段的实际文本字段，添加一个计时器以避免过多地移动视图。

Answer 2

这样做。 键盘可见后使用此代码

- (void)textFieldDidBeginEditing:(UITextField *)textField 
{
    [UIView beginAnimations:nil context:NULL];
    [UIView setAnimationDuration:0.25];
    self.view.frame = CGRectMake(0,-10,320,480);
    [UIView commitAnimations];

}

Answer 3

我以与 djromero 类似的方式执行此操作，只是我调整了视图的框架原点而不是其中心。

我要移动的视图是 UIScrollView，我希望它相对于 UITextField 元素移动，以便始终显示文本字段。此文本字段的位置可能会根据滚动视图的偏移量而有所不同。

所以我的代码如下所示：

- (void)viewDidLoad
{
    [super viewDidLoad];
    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardDidShow:) name:UIKeyboardDidShowNotification object:nil];
}

- (BOOL)textFieldShouldReturn:(UITextField *)textField
{
    [textField resignFirstResponder];
    dispatch_async(dispatch_get_main_queue(), ^{
        [UIView beginAnimations:nil context:nil];
        [UIView setAnimationDuration:0.2];
        [UIView setAnimationCurve:UIViewAnimationCurveLinear];
        self.scrollView.frame = CGRectMake(0,0,self.scrollView.frame.size.width,self.scrollView.frame.size.height);
        [UIView commitAnimations];
    });
    return YES;
}

- (NSInteger)getKeyBoardHeight:(NSNotification *)notification
{
    NSDictionary* keyboardInfo = [notification userInfo];
    NSValue* keyboardFrameBegin = [keyboardInfo valueForKey:UIKeyboardFrameBeginUserInfoKey];
    CGRect keyboardFrameBeginRect = [keyboardFrameBegin CGRectValue];
    NSInteger keyboardHeight = keyboardFrameBeginRect.size.height;
    return keyboardHeight;
}

-(void) keyboardDidShow:(NSNotification*) notification
{
    NSInteger keyboardHeight;
    keyboardHeight = [self getKeyBoardHeight:notification];
    NSInteger scrollViewFrameHeight = self.scrollView.frame.size.height;
    NSInteger textFieldRelativePosition = self.tableView.frame.origin.y - self.scrollView.contentOffset.y;
    NSInteger textFieldFrameOffset = scrollViewFrameHeight - textFieldRelativePosition;
    NSInteger movement = MAX(0,keyboardHeight-textFieldFrameOffset); // Offset from where the keyboard will appear.
    dispatch_async(dispatch_get_main_queue(), ^{
        [UIView beginAnimations:nil context:nil];
        [UIView setAnimationDuration:0.2];
        [UIView setAnimationCurve:UIViewAnimationCurveLinear];
        self.scrollView.frame = CGRectMake(0,-movement,
                                           self.scrollView.frame.size.width,
                                           self.scrollView.frame.size.height);
        [UIView commitAnimations];
    });
}

视图控制器是一个 UITextFieldDelegate 并且还订阅了 UIKeyboardDidShowNotification 以便我们能够访问键盘的大小。

当键盘显示时，我们计算 UITextField 的相对偏移量（调整滚动偏移量）和键盘，它们改变 UIScrollView 的原点，使其移动刚好足以让 UITextField 仍然显示。

如果即使出现键盘，UITextField 仍会显示，则原点不会改变。

Answer 4

这是实现这一目标的最简单有效的方法：

添加以下常量：

static const CGFloat KEYBOARD_ANIMATION_DURATION = 0.3;
static const CGFloat MINIMUM_SCROLL_FRACTION = 0.2;
static const CGFloat MAXIMUM_SCROLL_FRACTION = 0.8;
static const CGFloat PORTRAIT_KEYBOARD_HEIGHT = 216;
static const CGFloat LANDSCAPE_KEYBOARD_HEIGHT = 162;    

将此添加到您的视图控制器：

CGFloat animatedDistance;

并将这些方法添加到您的代码中：

- (void)textFieldDidBeginEditing:(UITextField *)textField{
CGRect textFieldRect =
[self.view.window convertRect:textField.bounds fromView:textField];
CGRect viewRect =
[self.view.window convertRect:self.view.bounds fromView:self.view];
CGFloat midline = textFieldRect.origin.y + 0.5 * textFieldRect.size.height;
CGFloat numerator =
midline - viewRect.origin.y
- MINIMUM_SCROLL_FRACTION * viewRect.size.height;
CGFloat denominator =
(MAXIMUM_SCROLL_FRACTION - MINIMUM_SCROLL_FRACTION)
* viewRect.size.height;
CGFloat heightFraction = numerator / denominator;
if (heightFraction < 0.0)
{
    heightFraction = 0.0;
}
else if (heightFraction > 1.0)
{
    heightFraction = 1.0;
}
UIInterfaceOrientation orientation =
[[UIApplication sharedApplication] statusBarOrientation];
if (orientation == UIInterfaceOrientationPortrait ||
    orientation == UIInterfaceOrientationPortraitUpsideDown)
{
    animatedDistance = floor(PORTRAIT_KEYBOARD_HEIGHT * heightFraction);
}
else
{
    animatedDistance = floor(LANDSCAPE_KEYBOARD_HEIGHT * heightFraction);
}
CGRect viewFrame = self.view.frame;
viewFrame.origin.y -= animatedDistance;

[UIView beginAnimations:nil context:NULL];
[UIView setAnimationBeginsFromCurrentState:YES];
[UIView setAnimationDuration:KEYBOARD_ANIMATION_DURATION];

[self.view setFrame:viewFrame];

[UIView commitAnimations];
}

- (void)textFieldDidEndEditing:(UITextField *)textfield{

CGRect viewFrame = self.view.frame;
viewFrame.origin.y += animatedDistance;

[UIView beginAnimations:nil context:NULL];
[UIView setAnimationBeginsFromCurrentState:YES];
[UIView setAnimationDuration:KEYBOARD_ANIMATION_DURATION];

[self.view setFrame:viewFrame];

[UIView commitAnimations];
}

Answer 5

标记，苹果文档： Managing the keyboard - Moving Content That Is Located Under the Keyboard

Answer 6

大概你有一些代码调用[myTextField becomeFirstResponder];。你应该在这个调用之后移动你的视图。

Answer 7

-(void)textFieldDidBeginEditing:(UITextField *)textField
{
    CGFloat y = textField.frame.origin.y;
    if (y >= 350) //not 380
   {
        CGRect frame = self.view.frame;
        frame.origin.y = 320 - textField.frame.origin.y;
        [UIView animateWithDuration:0.3 animations:^{self.view.frame = frame;}];
    }
}

-(void)textFieldDidEndEditing:(UITextField *)textField
{
CGRect returnframe =self.view.frame;
returnframe.origin.y = 0;
[UIView animateWithDuration:0.3 animations:^{self.view.frame = frame;}];
}

只需编辑这两个方法。
所有 d 代码的简单答案。在 if 语句中根据 iphone 更改值，即，如果 iphone 4S 将其更改为 265，并且在 didbeginediting 中将 320 更改为 240，如果 iphone 5 将其更改为 350，并且在 didbeginediting 方法中将其保留为 320，因为这是逻辑如果你明白

Answer 8

这是 Tendulkar 解决方案，但请记住原始框架尺寸并移除键盘。此解决方案适用于所有设备。

-(BOOL) textFieldShouldReturn:(UITextField *)textField{

[textField resignFirstResponder];

[UIView beginAnimations:nil context:NULL];
[UIView setAnimationDuration:0.25];
self.view.frame = CGRectMake(0,0,self.view.frame.size.width,self.view.frame.size.height);
[UIView commitAnimations];
return YES;
 }


- (void)textFieldDidBeginEditing:(UITextField *)textField
{
    [UIView beginAnimations:nil context:NULL];
    [UIView setAnimationDuration:0.25];
    self.view.frame = CGRectMake(0,-50,self.view.frame.size.width,self.view.frame.size.height);
    [UIView commitAnimations];

}

不要忘记设置 UITextField 委托！

Answer 9

Sample project Based on 苹果参考Keyboard Documentation

H 文件：（不要忘记 UITextFieldDelegate）

@property (weak, nonatomic) IBOutlet UIScrollView *scrollview;

@property (weak, nonatomic) IBOutlet UIView *myView;


    //items on view
@property (weak, nonatomic) IBOutlet UISwitch *partySwitch;
@property (weak, nonatomic) IBOutlet UILabel *partyLabel;
@property (weak, nonatomic) IBOutlet UITextField *partyNameTextfield;

M文件：

    //MARK: View Loading
- (void)viewDidLoad
{
    [super viewDidLoad];
        // Do any additional setup after loading the view.
}//eom

-(void)viewDidAppear:(BOOL)animated
{
    [self registerForKeyboardNotifications];
}//eom

    //MARK: textfield delegates
-(bool)textFieldShouldReturn:(UITextField *)textField
{
    [textField resignFirstResponder];
    return true;
}//eom

    //MARK: - Keyboard Observers
    // Call this method somewhere in your view controller setup code.
- (void)registerForKeyboardNotifications
{
    [[NSNotificationCenter defaultCenter] addObserver:self
                                             selector:@selector(keyboardWasShown:)
                                                 name:UIKeyboardDidShowNotification object:nil];

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

}


- (void)keyboardWasShown:(NSNotification*)aNotification
{
    NSDictionary* info      = [aNotification userInfo];
    CGSize kbSize           = [[info objectForKey:UIKeyboardFrameBeginUserInfoKey] CGRectValue].size;
    CGRect bkgndRect        = myView.superview.frame;
    bkgndRect.size.height += kbSize.height;

    [myView.superview setFrame:bkgndRect];
    [scrollview setContentOffset:CGPointMake(0.0, myView.frame.origin.y-kbSize.height) animated:YES];
}//eom

    // Called when the UIKeyboardWillHideNotification is sent
- (void)keyboardWillBeHidden:(NSNotification*)aNotification
{
    UIEdgeInsets contentInsets          = UIEdgeInsetsZero;
    scrollview.contentInset             = contentInsets;
    scrollview.scrollIndicatorInsets    = contentInsets;
}//eom