在你的视图控制器的头文件中添加<UITextFieldDelegate>到你的控制器接口的定义中，以便它符合UITextField委托协议…

@interface someViewController : UIViewController <UITextFieldDelegate>

．.． 在控制器的实现文件(.m)中添加以下方法，或者如果你已经有一个viewDidLoad方法，则在其中添加代码…

- (void)viewDidLoad
{
    // Do any additional setup after loading the view, typically from a nib.
    self.yourTextBox.delegate = self;
}

．.． 然后，链接你的文本框到你的实际文本字段

- (BOOL)textFieldShouldReturn:(UITextField *)theTextField 
{
    if (theTextField == yourTextBox) {
        [theTextField resignFirstResponder];
    }
    return YES;
}

子类化你的文本字段…还有textviews

在子类中放入此代码..

-(void)conformsToKeyboardDismissNotification{

    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(dismissKeyBoard) name:KEYBOARD_DISMISS object:nil];
}

-(void)deConformsToKeyboardDismissNotification{

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

- (void)dealloc{
    [[NSNotificationCenter defaultCenter] removeObserver:self];
    [self resignFirstResponder];
}

在textfield委托中(类似于textview委托)

-(void)textFieldDidBeginEditing:(JCPTextField *)textField{
     [textField conformsToKeyboardDismissNotification];
}


- (void)textFieldDidEndEditing:(JCPTextField *)textField{
    [textField deConformsToKeyboardDismissNotification];
}

都准备好了. .现在只需从代码中的任何地方发布通知。它将放弃任何键盘。

Try:

[self.view endEditing:YES];

更新

我找到了另一种简单的方法

简单地声明一个属性:-

@property( strong , nonatomic) UITextfield *currentTextfield;

和一个Tap Gesture Gecognizer:-

@property (strong , nonatomic) UITapGestureRecognizer *resignTextField;

在ViewDidLoad

_currentTextfield=[[UITextField alloc]init];
_resignTextField=[[UITapGestureRecognizer alloc]initWithTarget:@selector(tapMethod:)];

[self.view addGestureRecognizer:_resignTextField];

实现文本字段委托方法didBeginEditing

 -(void)textFieldDidBeginEditing:(UITextField *)textField{


      _currentTextfield=textField;

    }

实现点击手势方法(_resignTextField)

 -(void)tapMethod:(UITapGestureRecognizer *)Gesture{

     [_currentTextfield resignFirstResponder];

 }

你可以向应用程序发送一个nil目标动作，它会在任何时候辞职第一响应者，而不必担心哪个视图当前有第一响应者状态。

objective - c:

[[UIApplication sharedApplication] sendAction:@selector(resignFirstResponder) to:nil from:nil forEvent:nil];

斯威夫特3.0:

UIApplication.shared.sendAction(#selector(resignFirstResponder), to: nil, from: nil, for: nil)

在Mac OS X中，Nil目标操作在菜单命令中很常见，在iOS中也有使用。

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];

}