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
}

- (void)viewDidLoad
{
    [super viewDidLoad]; 

UITapGestureRecognizer *singleTapGestureRecognizer = [[UITapGestureRecognizer alloc]
                                                          initWithTarget:self
                                                          action:@selector(handleSingleTap:)];
    [singleTapGestureRecognizer setNumberOfTapsRequired:1];
    [singleTapGestureRecognizer requireGestureRecognizerToFail:singleTapGestureRecognizer];

    [self.view addGestureRecognizer:singleTapGestureRecognizer];
}

- (void)handleSingleTap:(UITapGestureRecognizer *)recognizer
{
    [self.view endEditing:YES];
    [textField resignFirstResponder];
    [scrollView setContentOffset:CGPointMake(0, -40) animated:YES];

}

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
    }
}

在viewDidLoad 斯威夫特4.2 代码是这样的

let viewTap: UITapGestureRecognizer = UITapGestureRecognizer(target: self, action:#selector(dismissKeyboard))
        view.addGestureRecognizer(viewTap)
@objc func dismissKeyboard() {
        view.endEditing(true)
    }

你可以在XCode 6及以上版本中使用Storyboard:

创建隐藏键盘的动作

将这个添加到ViewController使用的类的头文件中:

@interface TimeDelayViewController : UIViewController <UITextFieldDelegate>

- (IBAction)dissmissKeyboardOnTap:(id)sender;

@end

然后将这个添加到同一个ViewController的实现文件中:

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

这将是你的故事板场景(即ViewController)的“Received Actions”之一:

将操作连接到用户事件

现在，您需要将这个动作与触碰键盘的用户手势连接起来。

重要-你需要将包含在故事板中的“UIView”转换为UIControl，这样它就可以接收事件。从视图控制器场景层次结构中选择视图:

.．.并更改其类:

现在从你的场景的“received action”旁边的小圆圈拖到你的场景的“空”部分(实际上你是在把“received action”拖到UIControl上)。你会看到一个事件的选择，你可以连接你的行动:

选择“touch up inside”选项。现在，您已经将创建的IBAction连接到触碰键盘的用户操作。当用户点击键盘时，它将被隐藏。

(注意:要将动作与事件挂钩，你也可以从接收到的动作直接拖到视图控制器层次结构中的UIControl上。它在层次结构中显示为“Control”。)

这是一个很好的通用解决方案:

objective - c:

- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {
    [self.view endEditing:YES];    
}

迅速:

override func touchesBegan(touches: NSSet, withEvent event: UIEvent) {
    self.view.endEditing(true)
}

基于@icodebuster解决方案:https://stackoverflow.com/a/18756253/417652