你应该发送enditing:到工作窗口作为UIView的子类

[[UIApplication sharedApplication].windows.firstObject endEditing:NO];

比Meagar的回答更简单

覆盖touchesBegan: withEvent:

- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{
    [textField resignFirstResponder];`
}

当你在背景中触摸任何地方时，这将使键盘消失。

杰里米的回答不太适合我，我想是因为我在一个选项卡视图中有一个导航堆栈，上面有一个模态对话框。我现在使用下面的，它是为我工作，但你的里程可能会有所不同。

 // dismiss keyboard (mostly macro)
[[UIApplication sharedApplication].delegate dismissKeyboard]; // call this in your to app dismiss the keybaord

// --- dismiss keyboard (in indexAppDelegate.h) (mostly macro)
- (void)dismissKeyboard;

// --- dismiss keyboard (in indexAppDelegate.m) (mostly macro)
// do this from anywhere to dismiss the keybard
- (void)dismissKeyboard {    // from: http://stackoverflow.com/questions/741185/easy-way-to-dismiss-keyboard

    UITextField *tempTextField = [[UITextField alloc] initWithFrame:CGRectZero];

    UIViewController *myRootViewController = <#viewController#>; // for simple apps (INPUT: viewController is whatever your root controller is called.  Probably is a way to determine this progragrammatically)
    UIViewController *uivc;
    if (myRootViewController.navigationController != nil) { // for when there is a nav stack
        uivc = myRootViewController.navigationController;
    } else {
        uivc = myRootViewController;
    }

    if (uivc.modalViewController != nil) { // for when there is something modal
        uivc = uivc.modalViewController;
    } 

    [uivc.view  addSubview:tempTextField];

    [tempTextField becomeFirstResponder];
    [tempTextField resignFirstResponder];
    [tempTextField removeFromSuperview];
    [tempTextField release];

}

你应该发送enditing:到工作窗口作为UIView的子类

[[UIApplication sharedApplication].windows.firstObject endEditing:NO];

更好的方法是让某些东西“窃取”第一响应者的地位。

因为UIApplication是UIResponder的子类，你可以尝试:

[[UIApplication sharedApplication] becomeFirstResponder]
[[UIApplication sharedApplication] resignFirstResponder]

如果做不到这一点，创建一个新的UITextField与一个零大小的框架，将它添加到一个视图的某处，并做一些类似的事情(成为后跟辞职)。

用swift:

self.view.endEditing(true)