如何使返回键在 iPhone 上使键盘消失？

When the return key is pressed, call:

[uitextfield resignFirstResponder];

Implement the UITextFieldDelegate method like this:

- (BOOL)textFieldShouldReturn:(UITextField *)aTextField
{
[aTextField resignFirstResponder];
return YES;
}

First you need to conform to the UITextFieldDelegate Protocol in your View/ViewController's header file like this:

@interface YourViewController : UIViewController <UITextFieldDelegate>

Then in your .m file you need to implement the following UITextFieldDelegate protocol method:

- (BOOL)textFieldShouldReturn:(UITextField *)textField
{
[textField resignFirstResponder];


return YES;
}

[textField resignFirstResponder]; makes sure the keyboard is dismissed.

Make sure you're setting your view/viewcontroller to be the UITextField's delegate after you init the textfield in the .m:

yourTextField = [[UITextField alloc] initWithFrame:yourFrame];
//....
//....
//Setting the textField's properties
//....
//The next line is important!!
yourTextField.delegate = self; //self references the viewcontroller or view your textField is on

See Managing the Keyboard for a complete discussion on this topic.

Your UITextFields should have a delegate object (UITextFieldDelegate). Use the following code in your delegate to make the keyboard disappear:

- (BOOL)textFieldShouldReturn:(UITextField *)textField {
[textField resignFirstResponder];
}

Should work so far...

Took me couple trials, had same issue, this worked for me:

Check your spelling at -

(BOOL)textFieldShouldReturn:(UITextField *)textField {
[textField resignFirstResponder];

I corrected mine at textField instead of textfield, capitalise "F"... and bingo!! it worked..

You can add an IBAction to the uiTextField(the releation event is "Did End On Exit"),and the IBAction may named hideKeyboard,

-(IBAction)hideKeyboard:(id)sender
{
[uitextfield resignFirstResponder];
}

also,you can apply it to the other textFields or buttons,for example,you may add a hidden button to the view,when you click it to hide the keyboard.

After quite a bit of time hunting down something that makes sense, this is what I put together and it worked like a charm.

.h

//
//  ViewController.h
//  demoKeyboardScrolling
//
//  Created by Chris Cantley on 11/14/13.
//  Copyright (c) 2013 Chris Cantley. All rights reserved.
//


#import <UIKit/UIKit.h>


@interface ViewController : UIViewController <UITextFieldDelegate>


// Connect your text field to this the below property.
@property (weak, nonatomic) IBOutlet UITextField *theTextField;


@end

.m

//
//  ViewController.m
//  demoKeyboardScrolling
//
//  Created by Chris Cantley on 11/14/13.
//  Copyright (c) 2013 Chris Cantley. All rights reserved.
//


#import "ViewController.h"


@interface ViewController ()


@end


@implementation ViewController






- (void)viewDidLoad
{
[super viewDidLoad];
// _theTextField is the name of the parameter designated in the .h file.
_theTextField.returnKeyType = UIReturnKeyDone;
[_theTextField setDelegate:self];


}


// This part is more dynamic as it closes the keyboard regardless of what text field
// is being used when pressing return.
// You might want to control every single text field separately but that isn't
// what this code do.
-(void)textFieldShouldReturn:(UITextField *)textField
{
[textField resignFirstResponder];
}




@end

Hope this helps!

Set the Delegate of the UITextField to your ViewController, add a referencing outlet between the File's Owner and the UITextField, then implement this method:

-(BOOL)textFieldShouldReturn:(UITextField *)textField
{
if (textField == yourTextField)
{
[textField resignFirstResponder];
}
return NO;
}

Swift 2 :

this is what is did to do every thing !

close keyboard with Done button or Touch outSide ,Next for go to next input.

First Change TextFiled Return Key To Next in StoryBoard.

override func viewDidLoad() {
txtBillIdentifier.delegate = self
txtBillIdentifier.tag = 1
txtPayIdentifier.delegate  = self
txtPayIdentifier.tag  = 2


let tap = UITapGestureRecognizer(target: self, action: "onTouchGesture")
self.view.addGestureRecognizer(tap)


}


func textFieldShouldReturn(textField: UITextField) -> Bool {
if(textField.returnKeyType == UIReturnKeyType.Default) {
if let next = textField.superview?.viewWithTag(textField.tag+1) as? UITextField {
next.becomeFirstResponder()
return false
}
}
textField.resignFirstResponder()
return false
}


func onTouchGesture(){
self.view.endEditing(true)
}

You can try this UITextfield subclass which you can set a condition for the text to dynamically change the UIReturnKey:
https://github.com/codeinteractiveapps/OBReturnKeyTextField

If you want to disappear keyboard when writing on alert box textfileds

[[alertController.textFields objectAtIndex:1] resignFirstResponder];

Add this instead of the pre-defined class

class ViewController: UIViewController, UITextFieldDelegate {

To remove keyboard when clicked outside the keyboard

override func touchesBegan(touches: Set<UITouch>, withEvent event: UIEvent?) {
self.view.endEditing(true)
}

and to remove keyboard when pressed enter

add this line in viewDidLoad()

inputField is the name of the textField used.

self.inputField.delegate = self

and add this function

func textFieldShouldReturn(textField: UITextField) -> Bool {
textField.resignFirstResponder()
return true
}

in swift you should delegate UITextfieldDelegate, its important don't forget it, in the viewController, like:

class MyViewController: UITextfieldDelegate{


mytextfield.delegate = self


func textFieldShouldReturn(textField: UITextField) -> Bool {
textField.resignFirstResponder()
}
}