如何使用返回键关闭UITextView的键盘？

Question

在IB的库中,介绍告诉我们,当return按下键时,键盘UITextView将消失.但实际上return密钥只能作为'\n'.

我可以添加一个按钮并[txtView resignFirstResponder]用来隐藏键盘.

但有没有办法return在键盘中添加键的动作,以便我不需要添加UIButton？

Answer 1

想我会在这里发布片段代替:

确保声明对UITextViewDelegate协议的支持.

- (BOOL)textView:(UITextView *)textView shouldChangeTextInRange:(NSRange)range replacementText:(NSString *)text {

    if([text isEqualToString:@"\n"]) {
        [textView resignFirstResponder];
        return NO;
    }

    return YES;
}

Swift 4.0更新:

func textView(_ textView: UITextView, shouldChangeTextIn range: NSRange, replacementText text: String) -> Bool {
    if text == "\n" {
        textView.resignFirstResponder()
        return false
    }
    return true
}

Answer 2

UITextView没有任何方法将在用户点击返回键时调用.如果您希望用户只能添加一行文本,请使用UITextField.点击返回并将键盘隐藏为a UITextView不符合界面指南.

即使这样,如果你想这样做,实现textView:shouldChangeTextInRange:replacementText:方法,UITextViewDelegate并检查替换文本是否\n隐藏键盘.

可能还有其他方法,但我不知道.

Answer 3

我知道这已经回答了,但我真的不喜欢使用新行的字符串文字,所以这就是我所做的.

- (BOOL)textView:(UITextView *)txtView shouldChangeTextInRange:(NSRange)range replacementText:(NSString *)text {
    if( [text rangeOfCharacterFromSet:[NSCharacterSet newlineCharacterSet]].location == NSNotFound ) {
        return YES;
    }

    [txtView resignFirstResponder];
    return NO;
}

Swift 4.0更新:

func textView(_ textView: UITextView, shouldChangeTextIn range: NSRange, replacementText text: String) -> Bool {
if (text as NSString).rangeOfCharacter(from: CharacterSet.newlines).location == NSNotFound {
    return true
}
txtView.resignFirstResponder()
return false
}

Answer 4

我知道这已经被回答了很多次,但这是我的两分钱.

我发现答案samvermette和ribeto真正有用的,并且还发表谈话牛魔王在ribeto的答案.但这些方法存在问题.但问题亚光提到在samvermette的答案,那就是如果用户想要的东西贴里面有一条线突破时,键盘会隐藏不粘贴任何东西.

所以我的方法是上面提到的三个解决方案的混合,只检查当字符串的长度为1时输入的字符串是否为新行,因此我们确保用户输入而不是粘贴.

这是我做的:

- (BOOL)textView:(UITextView *)textView shouldChangeTextInRange:(NSRange)range replacementText:(NSString *)text {
    NSRange resultRange = [text rangeOfCharacterFromSet:[NSCharacterSet newlineCharacterSet] options:NSBackwardsSearch];
    if ([text length] == 1 && resultRange.location != NSNotFound) {
        [textView resignFirstResponder];
        return NO;
    }

    return YES;
}

Answer 5

更优雅的方法是当用户轻敲键盘框架外的某个位置时关闭键盘.

首先,将ViewController的视图设置为UIBuilder中的标识检查器中的"UIControl"类.控制 - 将视图拖动到ViewController的头文件中,并将其作为Touch Up Inside事件的动作链接,例如:

ViewController.h

-(IBAction)dismissKeyboardOnTap:(id)sender;

在ViewController主文件中,ViewController.m:

-(IBAction)dismissKeyboardOnTap:(id)sender
    {
         [[self view] endEditing:YES];
    }

您可以使用类似技术进行双击或长按.您可能需要将ViewController设置为UITextViewDelegate并将TextView连接到ViewController.此方法适用于UITextView和UITextField.

资料来源:Big Nerd Ranch

编辑:我还想补充说,如果您使用的是UIScrollView,上述技术可能无法通过Interface Builder轻松完成.在这种情况下,您可以使用UIGestureRecognizer并在其中调用[[self view] endEditing:YES]方法.一个例子是:

-(void)ViewDidLoad{
    ....
    UITapGestureRecognizer *tapRec = [[UITapGestureRecognizer alloc] 
        initWithTarget:self action:@selector(tap:)];
    [self.view addGestureRecognizer: tapRec];
    ....
}

-(void)tap:(UITapGestureRecognizer *)tapRec{
    [[self view] endEditing: YES];
}

当用户点击键盘外部并且没有点击入口空间时,键盘将被解除.

Answer 6

在视图控制器中添加此方法.

斯威夫特:

func textView(textView: UITextView, shouldChangeTextInRange range: NSRange, replacementText text: String) -> Bool {
    if text == "\n" {
        textView.resignFirstResponder()
        return false
    }
    return true
}

这个方法也对你有所帮助:

/**
Dismiss keyboard when tapped outside the keyboard or textView

:param: touches the touches
:param: event   the related event
*/
override func touchesBegan(touches: NSSet, withEvent event: UIEvent) {
    if let touch = touches.anyObject() as? UITouch {
        if touch.phase == UITouchPhase.Began {
            textField?.resignFirstResponder()
        }
    }
}

Answer 7

-(BOOL)textView:(UITextView *)textView shouldChangeTextInRange:(NSRange)range replacementText:(NSString *)text {
    if([text isEqualToString:@"\n"])
        [textView resignFirstResponder];
    return YES;
}

yourtextView.delegate=self;

还添加 UITextViewDelegate

不要忘记确认协议

如果您没有添加if([text isEqualToString:@"\n"]),则无法编辑

Answer 8

使用uitextview时还有另一种解决方案,你可以在"textViewShouldBeginEditing"中添加工具栏作为InputAccessoryView,从这个工具栏的完成按钮可以解除键盘,其代码如下:

在viewDidLoad中

toolBar = [[UIToolbar alloc]initWithFrame:CGRectMake(0, 0, 320, 44)]; //toolbar is uitoolbar object
toolBar.barStyle = UIBarStyleBlackOpaque;
UIBarButtonItem *btnDone = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemDone target:self action:@selector(btnClickedDone:)];
[toolBar setItems:[NSArray arrayWithObject:btnDone]];

在textviewdelegate方法中

- (BOOL)textViewShouldBeginEditing:(UITextView *)textView
{
     [textView setInputAccessoryView:toolBar];
     return YES;
}

在工具栏中的Button Done的操作如下:

-(IBAction)btnClickedDone:(id)sender
{
    [self.view endEditing:YES];
}

Answer 9

我发现josebama的答案是这个帖子中最完整,最干净的答案.

下面是它的Swift 4语法:

func textView(_ textView: UITextView, shouldChangeTextIn _: NSRange, replacementText text: String) -> Bool {
    let resultRange = text.rangeOfCharacter(from: CharacterSet.newlines, options: .backwards)
    if text.count == 1 && resultRange != nil {
        textView.resignFirstResponder()
        // Do any additional stuff here
        return false
    }
    return true
}

Answer 10

与使用UITextViewDelegate但较新的 swift 界面的其他答案类似isNewline：

func textView(_ textView: UITextView, shouldChangeTextIn range: NSRange, replacementText text: String) -> Bool {
    if let character = text.first, character.isNewline {
        textView.resignFirstResponder()
        return false
    }
    return true
}

Answer 11

使用导航控制器来托管一个条以关闭键盘:

在.h文件中:

UIBarButtonItem* dismissKeyboardButton;

在.m文件中:

- (void)viewDidLoad {
    dismissKeyboardButton = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemDone target:self action:@selector(dismissKeyboard)];
}

-(void)textViewDidBeginEditing:(UITextView *)textView {
    self.navigationItem.rightBarButtonItem = dismissKeyboardButton;
}

-(void)textFieldDidBeginEditing:(UITextField *)textField {
    self.navigationItem.rightBarButtonItem = dismissKeyboardButton;
}

-(void)dismissKeyboard {
    [self.textField resignFirstResponder];
    [self.textView resignFirstResponder];
    //or replace this with your regular right button
    self.navigationItem.rightBarButtonItem = nil;
}

Answer 12

迅速

func textView(textView: UITextView, shouldChangeTextInRange range: NSRange, replacementText text: String) -> Bool {
    if text == "\n" {
        textView.resignFirstResponder()
    }
    return true
}

Answer 13

就像对samvermette的暗淡评论一样,我也不喜欢检测"\n"的想法.在UITextView中出现"return"键是有原因的,那就是当然要转到下一行.

在我看来,最好的解决方案是模仿iPhone消息应用程序 - 即在键盘上添加工具栏(和按钮).

我从以下博客文章中获得了代码:

http://www.iosdevnotes.com/2011/02/iphone-keyboard-toolbar/

脚步:

- 将工具栏添加到XIB文件 - 将高度设置为460

- 添加工具栏按钮项(如果尚未添加).如果需要右对齐,还可以向XIB添加灵活的条形按钮项,并移动工具栏按钮项

- 创建将按钮项链接到resignFirstResponder的操作,如下所示:

- (IBAction)hideKeyboard:(id)sender {
    [yourUITextView resignFirstResponder];
}

-然后:

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

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

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

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

- (void)keyboardWillShow:(NSNotification *)notification {
    [UIView beginAnimations:nil context:NULL];
    [UIView setAnimationDuration:0.3];

    CGRect frame = self.keyboardToolbar.frame;
    frame.origin.y = self.view.frame.size.height - 260.0;
    self.keyboardToolbar.frame = frame;

    [UIView commitAnimations];
}

- (void)keyboardWillHide:(NSNotification *)notification {
    [UIView beginAnimations:nil context:NULL];
    [UIView setAnimationDuration:0.3];

    CGRect frame = self.keyboardToolbar.frame;
    frame.origin.y = self.view.frame.size.height;
    self.keyboardToolbar.frame = frame;

    [UIView commitAnimations];
}

Answer 14

在viewDidLoad中添加一个观察者

[[NSNotificationCenter defaultCenter] addObserver: self selector: @selector(textViewKeyPressed:) name: UITextViewTextDidChangeNotification object: nil];

然后使用选择器检查"\n"

-(void) textViewKeyPressed: (NSNotification*) notification {

  if ([[[notification object] text] hasSuffix:@"\n"])
  {
    [[notification object] resignFirstResponder];
  }
}

它确实使用"\n"而不是专门检查返回键,但我认为这没关系.

UPDATE

请参阅下面使用ribto的答案[NSCharacterSet newlineCharacterSet]代替\n

Answer 15

刚刚以不同的方式解决了这个问题.

• 创建一个将放置在后台的按钮
• 从"属性"检查器中,将按钮类型更改为"自定义",并使按钮透明.
• 展开按钮以覆盖整个视图,并确保按钮位于所有其他对象的后面.简单的方法是将按钮拖动到视图中列表视图的顶部

• 控制将按钮拖动到viewController.h文件并创建一个动作(已发送事件:内部触摸),如:

  (IBAction)ExitKeyboard:(id)sender;
  

• 在ViewController.m应该是这样的:

  (IBAction)ExitKeyboard:(id)sender {
      [self.view endEditing:TRUE];
  }
  

• 运行应用程序,当您单击TextView时,键盘将消失

Answer 16

SWIFT代码

在你的类/视图中实现 UITextViewDelegate 像这样：

class MyClass: UITextViewDelegate  { ...

将 textView 委托设置为 self

myTextView.delegate = self

然后执行以下操作：

  func textViewDidChange(_ textView: UITextView) {
    if textView.text.characters.count >= 1 {

        if let lastChar = textView.text.characters.last {

            if(lastChar == "\n"){

              textView.text = textView.text.substring(to: textView.text.index(before: textView.text.endIndex))
              textView.resignFirstResponder()
            }
        }
    }
}

编辑 我更新了代码，因为将文本字段中的用户输入更改为解决方法而不是在黑客代码完成后重置状态从来都不是一个好主意。