所以我只需要解决这个问题，之前的答案都不适用。我的情况是:一个UISearchBar，加上屏幕上的一些其他控件。我想在搜索栏之外点击键盘，但不传播到任何其他控件。当键盘被隐藏时，我希望所有的控制都能工作。

我做了什么:

1)在我的视图控制器中实现一个自定义触摸处理程序。

override func touchesBegan(touches: Set<UITouch>, withEvent event: UIEvent?)
{
    if searchBar.isFirstResponder()
    {
        // This causes the first responder, whoever it is, to resign first responder, and hide the keyboard.
        // We also "eat" the touch here and not allow it to propagate further.
        view.endEditing(true)
    }
    else
    {
        // OK to propagate the touch
        super.touchesBegan(touches, withEvent: event)
    }
}

2)添加了一对委托方法(我的是UISearchBar，但也有类似的UITextField)。下面代码中的controlContainerView是一个UIView，里面有一堆按钮。记住，在父视图上设置userInteractionEnabled会禁用它的所有子视图。

 func searchBarTextDidBeginEditing(searchBar: UISearchBar)
 {
     controlContainerView.userInteractionEnabled = false
     someButton.userInteractionEnabled = false
 }

 func searchBarTextDidEndEditing(searchBar: UISearchBar)
 {
     searchBar.resignFirstResponder()

    // Done editing: enable the other controls again.

    controlContainerView.userInteractionEnabled = false
    someButton.userInteractionEnabled = false
}

这里有很多关于使用UITapGestureRecognizer的很好的答案——所有这些都打破了UITextField的clear (X)按钮。解决方案是通过它的委托来抑制手势识别器:

- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldReceiveTouch:(UITouch *)touch {
    BOOL touchViewIsButton = [touch.view isKindOfClass:[UIButton class]];
    BOOL touchSuperviewIsTextField = [[touch.view superview] isKindOfClass:[UITextField class]];
    return !(touchViewIsButton && touchSuperviewIsTextField);
}

这不是最可靠的解决方案，但对我来说很管用。

你需要添加一个UITapGestureRecogniser并将其分配给视图，然后在它的选择器上的UITextField上调用resign first responder。

代码:

在viewDidLoad

UITapGestureRecognizer *tap = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(dismissKeyboard)];

[self.view addGestureRecognizer:tap];

在dismissKeyboard:

-(void)dismissKeyboard 
{
    [aTextField resignFirstResponder];
}

(其中，aTextField是负责键盘的文本字段)

Swift 3版本是这样的

let tapGesture = UITapGestureRecognizer(target: self, action: #selector(self.dismissKeyboard (_:)))
self.view.addGestureRecognizer(tapGesture)

对于dismissKeyboard

@objc func dismissKeyboard (_ sender: UITapGestureRecognizer) {
    aTextField.resignFirstResponder()
}

在这种情况下，可以使用ScrollView，并添加到文本字段在ScrollView和我想点击ScrollView和视图，然后解散键盘。为了以防万一，我尝试创建了示例代码。像这样,

import UIKit

class ViewController: UIViewController {

    @IBOutlet weak var scrollView: UIScrollView!
    @IBOutlet weak var textField: UITextField!

    override func viewDidLoad() {
        super.viewDidLoad()

        let tapGesture = UITapGestureRecognizer(target: self, action: #selector(ViewController.tap(_:)))
        view.addGestureRecognizer(tapGesture)
        // Do any additional setup after loading the view, typically from a nib.
    }
    func tap(gesture: UITapGestureRecognizer) {
        textField.resignFirstResponder()
    }
    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }
}

你的故事板看，就像。

看看这个，这是最简单的方法，

-(void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event{
      [self.view endEditing:YES];// this will do the trick
}

Or

这个库将处理包括滚动条自动滚动，点击空间隐藏键盘等…

https://github.com/michaeltyson/TPKeyboardAvoiding

斯威夫特4

用这个扩展方法设置你的UIViewController，例如在viewDidLoad中:

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

即使点击导航栏，键盘也会被取消。

import UIKit
extension UIViewController {
    /// Call this once to dismiss open keyboards by tapping anywhere in the view controller
    func setupHideKeyboardOnTap() {
        self.view.addGestureRecognizer(self.endEditingRecognizer())
        self.navigationController?.navigationBar.addGestureRecognizer(self.endEditingRecognizer())
    }

    /// Dismisses the keyboard from self.view
    private func endEditingRecognizer() -> UIGestureRecognizer {
        let tap = UITapGestureRecognizer(target: self.view, action: #selector(self.view.endEditing(_:)))
        tap.cancelsTouchesInView = false
        return tap
    }
}