关闭 UIScrollView 中的键盘

Question

好吧，我在 UIScrollView 中有几个 UITextFields 和 UITextViews，我想将键盘设置为在 UIScrollView 出现时消失。 >scrollview 被触摸或滚动（当然，当您触摸文本字段/视图内部时除外）。

我当前的尝试是将 UIScrollView 替换为子类，并将其设置为调用 touchesBegan 方法内的removeKeyboard 函数（在主视图控制器内定义）。但是，这只会删除正常触摸时的键盘，而不是在简单滚动视图时删除键盘。那么，在 UIScrollView 中删除键盘的最佳方法是什么？

预先感谢您的帮助。

Answer 1

这是在 iOS 7.0 及更高版本中实现此目的的最简洁方法。

scrollView.keyboardDismissMode = UIScrollViewKeyboardDismissModeOnDrag;

或者

scrollView.keyboardDismissMode = UIScrollViewKeyboardDismissModeInteractive;

用 Swift 表示：

scrollView.keyboardDismissMode = .onDrag

或者

scrollView.keyboardDismissMode = .interactive

Answer 2

有点晚了，但如果其他人正在寻找这个问题的答案，这就是我解决它的方法：

1）创建一个带有目标回调方法的点击手势识别器，以在所有字段上使用 resignFirstResponder 关闭键盘。

2) 将点击手势添加到滚动视图。

这是一个例子：

UITapGestureRecognizer *tapGesture = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(hideKeyboard)];

// prevents the scroll view from swallowing up the touch event of child buttons
tapGesture.cancelsTouchesInView = NO;    

[pageScrollView addGestureRecognizer:tapGesture];

[tapGesture release];

...

// method to hide keyboard when user taps on a scrollview
-(void)hideKeyboard
{
    [myTextFieldInScrollView resignFirstResponder];
}

Answer 3

虽然本质是一样的，但我更喜欢更少的代码。

在属性检查器中设置滚动视图滚动时键盘消失：

然后滚动视图时消失键盘被点击：

1. 将点击手势识别器拖动到滚动视图上
2. 
3. 
4. 动作中只有一行—— scrollView.endEditing(true)。如果您使用的是 Objective-C，[self.scrollView endEditing: YES];

Answer 4

在 Swift 中：

有点晚了，但如果其他人正在寻找这个问题的答案，这就是我解决它的方法：

1）创建一个带有目标回调方法的点击手势识别器来关闭键盘在所有字段上使用 resignFirstResponder 。

2) 将点击手势添加到滚动视图。

这是一个例子：

import UIKit

class ViewController: UIViewController {

    @IBOutlet var t1: UITextField!
    @IBOutlet var t2: UITextField!
    @IBOutlet var t3: UITextField!
    @IBOutlet var t4: UITextField!

    @IBOutlet var srcScrollView: UIScrollView!

    override func viewDidLoad() {
        super.viewDidLoad()
        // Do any additional setup after loading the view, typically from a nib.

        let tapGesture: UITapGestureRecognizer = UITapGestureRecognizer(target: self, action: "hideKeyboard")

        // prevents the scroll view from swallowing up the touch event of child buttons
        tapGesture.cancelsTouchesInView = false

        srcScrollView.addGestureRecognizer(tapGesture)
    }

    func hideKeyboard() {
        t1.resignFirstResponder()
        t2.resignFirstResponder()
        t3.resignFirstResponder()
        t4.resignFirstResponder()
    }
}

Answer 5

查看 UIScrollView 的 keyboardDismissMode 属性。

// will hide keyboard when your text field is about to go beyond the keyboard.
vwScrollView.keyboardDismissMode = UIScrollViewKeyboardDismissModeInteractive;

// will hide keyboard instantly once the scroll view started scrolling by user.
vwScrollView.keyboardDismissMode = UIScrollViewKeyboardDismissOnDrag;

// If you need to hide keyboard on tap of scroll view,consider adding a tap gesture or sub class and override touchesbegan: method.

迅捷版

vwScrollView.keyboardDismissMode = .interactive
vwScrollView.keyboardDismissMode = .onDrag

Answer 6

创建一个扩展类，用于在触摸任何地方的滚动视图/视图时隐藏键盘

extension UIViewController {
  func hideKeyboardWhenTappedAround() {
    let tap: UITapGestureRecognizer = UITapGestureRecognizer(target: self, action: #selector(UIViewController.dismissKeyboard))
    tap.cancelsTouchesInView = false
    view.addGestureRecognizer(tap)
  }
    
  @objc func dismissKeyboard() {
    view.endEditing(true)
  }
}

并在 viewDidLoad 中调用此方法，如下所示

override func viewDidLoad() {
  super.viewDidLoad()
  self.hideKeyboardWhenTappedAround()    
}

Answer 7

试试这个

[self.selectedViewController.view endEditing:YES];

Answer 8

有点晚了，但如果其他人正在使用 Swift 3 寻找这个问题的答案：

func scrollViewDidScroll(_ scrollView: UIScrollView) {
    view.endEditing(true)
}

Answer 9

当我将手势添加到 UIScrollView 的子类时，我遇到了视图树中各种手势相互干扰的问题，例如能够单击子视图、滚动视图以及键盘在所有情况下都会消失。我想出了这个解决方案，它可以从 UIScrollView 的超类或 UIViewController 进行设置。

DismissKeyboardTapGesture 类使用 ARC，可处理视图下的任何文本字段，并且不会接管来自子视图（如按钮）的任何点击。还利用iOS7的滚动效果来消除键盘。

从 UIScrollView 超类设置：

    _dismissKeyboard = [[DismissKeyboardTapGesture alloc] initWithView:self];

或从 UIViewController 设置：

    _dismissKeyboard = [[DismissKeyboardTapGesture alloc] initWithView:self.view];

这是该类：

@interface DismissKeyboardTapGesture : NSObject <UIGestureRecognizerDelegate>

@end

@implementation DismissKeyboardTapGesture

- (id)initWithView:(UIView *)view
{
    self = [super init];
    if (self) {
        UITapGestureRecognizer *singleTap = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(singleTap:)];
        singleTap.cancelsTouchesInView = NO;
        singleTap.delegate = self;
        [view addGestureRecognizer:singleTap];

        if ([view respondsToSelector:@selector(setKeyboardDismissMode:)]) {
            // Bonus effect to dismiss keyboard by scrolling
            ((UIScrollView *)view).keyboardDismissMode = UIScrollViewKeyboardDismissModeInteractive;
        }
    }
    return self;
}

- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldRecognizeSimultaneouslyWithGestureRecognizer:(UIGestureRecognizer *)otherGestureRecognizer
{
    // Don't stop any existing gestures in our view from working
    if (otherGestureRecognizer.view == gestureRecognizer.view) {
        return YES;
    }
    return NO;
}

- (void)singleTap:(UIGestureRecognizer*)gestureRecognizer
{
    // Close keyboard for any text edit views that are children of the main view
    [gestureRecognizer.view endEditing:YES];
}

@end

Answer 10

尝试这个滚动视图委托方法 -

将 IB 中的委托链接到滚动视图，然后复制此代码（根据您的需要进行修改）。

- (void)scrollViewDidEndDragging:(UIScrollView *)scrollView willDecelerate:(BOOL)decelerate
{         
//sample code    
    [challengeABallotComponent.voterNameTextField resignFirstResponder];
    [challengeABallotComponent.ballotNumberTextField resignFirstResponder];
    [locationInformation.pollingLocation resignFirstResponder];
}

这应该有效。您也可以尝试其他委托方法，例如

   -(void)scrollViewDidScroll: (UIScrollView *)scrollView 
{
//do your stuff
}

Answer 11

scrollView.keyboardDismissMode = UIScrollViewKeyboardDismissModeOnDrag;

Answer 12

    extension UIView{
    //Set tag via storyboard 
    func keyboardDissmissInteractiveMode(_ tag:Int){
        if let scrollView = self.viewWithTag(tag) as? UIScrollView{
            scrollView.keyboardDismissMode = .interactive
        }
        if let tableview = self.viewWithTag(tag) as? UITableView{
            tableview.keyboardDismissMode = .interactive
        }
    }

    func keyboardDissmissOnDragMode(_ tag:Int){
        if let scrollView = self.viewWithTag(tag) as? UIScrollView{
            scrollView.keyboardDismissMode = .onDrag
        }
        if let tableview = self.viewWithTag(tag) as? UITableView{
            tableview.keyboardDismissMode = .onDrag
        }
    }


    func keyboardDissmissInteractiveMode(_ view:UIView){
        if let scrollView = view as? UIScrollView{
            scrollView.keyboardDismissMode = .interactive
        }
        if let tableview = view as? UITableView{
            tableview.keyboardDismissMode = .interactive
        }
    }

    func keyboardDissmissOnDragMode(_ view:UIView){
        if let scrollView = view as? UIScrollView{
            scrollView.keyboardDismissMode = .onDrag
        }
        if let tableview = view as? UITableView{
            tableview.keyboardDismissMode = .onDrag
        }
    }
}