当键盘出现在 iOS 中时启用滚动内容

Posted 2023-03-16

【中文标题】当键盘出现在 iOS 中时启用滚动内容

【英文标题】：Enable scrolling content when keyboard appears in iOS

【发布时间】：2015-09-25 06:11:33

【问题描述】：

我在 iPhone 上有一个应用程序，它在 viewcontroller 中有很多内容。一般主要内容是形式。我的问题是我放了键盘，想输入一些值来形成字段，大部分内容是不可见的。我想在键盘出现时滚动这个内容。我怎样才能做到这一点？ 我的视图没有滚动视图，但我尝试这样做但它不起作用。

到目前为止，我发现的所有提示都涉及如何放置使用过的文本框，但这不是我的假设。

【问题讨论】：

***.com/questions/1126726/… 的可能重复项

在主视图上添加滚动视图？

【参考方案1】：

这就是我所做的，当键盘像这样上下升降时，我改变了顶部约束-

在viewDidLoad调用这个方法-

   [self observeKeyboard];
#pragma mark- Keyboard Listen Methods
- (void)observeKeyboard 
[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardWillShow:) name:UIKeyboardWillChangeFrameNotification object:nil];
[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardWillHide:) name:UIKeyboardWillHideNotification object:nil];



- (void)keyboardWillShow:(NSNotification *)notification 
NSDictionary *info = [notification userInfo];
NSValue *kbFrame = [info objectForKey:UIKeyboardFrameEndUserInfoKey];
NSTimeInterval animationDuration = [[info objectForKey:UIKeyboardAnimationDurationUserInfoKey] doubleValue];
CGRect keyboardFrame = [kbFrame CGRectValue];
CGFloat height = keyboardFrame.size.height;
self.COnstraintTopViewVertical.constant=(value of constant)-height;
[UIView animateWithDuration:animationDuration animations:^
    [self.view layoutIfNeeded];
];


- (void)keyboardWillHide:(NSNotification *)notification 
NSDictionary *info = [notification userInfo];
NSTimeInterval animationDuration = [[info objectForKey:UIKeyboardAnimationDurationUserInfoKey] doubleValue];
self.ConstraintTopViewVertical.constant=reset value;
[UIView animateWithDuration:animationDuration animations:^
    [self.view layoutIfNeeded];
];

【参考方案2】：

您可以使用以下代码在键盘出现时以编程方式更改视图中的位置：

func keyboardWasShown(notification: NSNotification) 

    UIView.animateWithDuration(0.3, animations:  () -> Void in
        self.setContentOffset(CGPoint(x: setXOffsetHere, y: setYOffsetHere), animated: true)
    )

此代码将在键盘出现后将视图转换到您在 .setContentOffset 调用中指定的坐标。您仍然需要获取坐标，但通常从情节提要中获取坐标非常简单。

【参考方案3】：

将所有视图放在滚动视图中 设置从滚动视图底部到超级视图底部的自动布局约束

在viewWillAppear

[[NSNotificationCenter defaultCenter] addObserver:self
                                     selector:@selector(keyboardWillChangeFrame:)
                                         name:UIKeyboardWillChangeFrameNotification object:nil];

处理知识库通知

- (void)keyboardWillChangeFrame:(NSNotification*)aNotification

    CGRect kbFrame = [aNotification.userInfo[UIKeyboardFrameEndUserInfoKey] CGRectValue];
    CGRect kbWindowIntersectionFrame = CGRectIntersection(self.view.window.bounds, kbFrame);

    [UIView animateWithDuration:[aNotification.userInfo[UIKeyboardAnimationDurationUserInfoKey] doubleValue] animations:^
        self.scrollVBottomConstraint.constant = kbWindowIntersectionFrame.size.height;
        [self.view layoutIfNeeded];
    ];

【参考方案4】：

what i got from your question is: you are using textfield on UIView which is not on the scrollview, now you have to scroll the UIView when keyboard appears. just do following stuff.
-Give the tag to your textfield.
-suppose tag you have given is 4545646
-do not forgot to assign delegate to your textfield (it will execute below delegate method when you start to edit)
- (void)textFieldDidBeginEditing:(UITextField *)textField

    if (textField.tag == 4545646) 
        UIView *contanerView = [self.view viewWithTag:5556466];
        [UIView animateWithDuration:0.5 animations:^
            contanerView.frame = CGRectMake(self.view.frame.origin.x+1, -85, self.view.frame.size.width, self.view.frame.size.height-9);
        ];
    

Change the frame as per your requirement.
and 
- (void)textFieldDidEndEditing:(UITextField *)textField 
    if (textField.tag == 4545646) 
        [textField resignFirstResponder];
        UIView *contanerView = [self.view viewWithTag:5556466];
        [UIView animateWithDuration:0.5 animations:^
            contanerView.frame = CGRectMake(self.view.frame.origin.x+1, self.view.frame.origin.y, self.view.frame.size.width, self.view.frame.size.height);
        ];

【讨论】：

contanerView 是设置文本字段的视图

【参考方案5】：

在 viewDidAppear 添加以下通知

[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyBoardShown:) name:UIKeyboardWillShowNotification object:nil];

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

在keyBoardShown方法中获取键盘高度

 - (void)keyBoardShown:(NSNotification*)notification

    if(self.view.frame.origin.y>=0)
    
        NSDictionary* keyboardInfo = [notification userInfo];
        NSValue* keyboardFrameBegin = [keyboardInfo valueForKey:UIKeyboardFrameBeginUserInfoKey];
        CGRect keyboardFrameBeginRect = [keyboardFrameBegin CGRectValue];

        //    NSLog(@"hihi : %f",keyboardFrameBeginRect.size.height);

        keyBoardHeight = keyboardFrameBeginRect.size.height-yDeault+50;


        if (keyBoardHeight>0) 
            [UIView beginAnimations:nil context:nil];
            [UIView setAnimationDuration:0.5];

            [UIView setAnimationCurve:UIViewAnimationCurveEaseOut];
            self.view.frame = CGRectMake(self.view.frame.origin.x, (self.view.frame.origin.y-keyBoardHeight), self.view.frame.size.width, self.view.frame.size.height);
            [UIView commitAnimations];
        


    

在 keyBoardDismiss 中将主视图 y 坐标回退到之前的值

-(void)keyBoardDismiss:(NSNotification*)notification
    if(self.view.frame.origin.y<0)
        [UIView beginAnimations:nil context:nil];
        [UIView setAnimationDuration:0.5];

        [UIView setAnimationCurve:UIViewAnimationCurveEaseOut];
        self.view.frame = CGRectMake(self.view.frame.origin.x, (self.view.frame.origin.y+keyBoardHeight), self.view.frame.size.width, self.view.frame.size.height);
        [UIView commitAnimations];
    

这里 yDeault 是文本域的 y 坐标值

 yDeault= screenHeight-textField.frame.origin.y+textField.frame.size.height;

一旦显示键盘，主视图将向上移动，一旦键盘关闭，主视图将移回原始位置

【参考方案6】：

好的。我做了这个。我只需要添加滚动视图，但在我的应用程序中可能我必须重建我的所有视图。

【参考方案7】：

无需添加滚动视图。您可以直接执行此操作。您可以更改self.view.frame 而无需滚动视图。