How to dismiss the keyboard when done editing a text field - ios

Question

I have a simple program where you can type text into a text field, hit an ok button, and a label updates with the text entered.
I want the iPhone keyboard to disappear when I hit the OK button, when I press a large button that is in the background covering the whole view, or when I hit the return button on the keyboard. I have been trying to use the
[textField resignFirstResponder]
method, but it is not working. The program compiles fine, but when this method is called from any one of those events, it stops, and I get a message saying:
Thread 1: signal SIGABRT"
What am I doing wrong?
#import "ViewController.h"
#interface ViewController ()
#end
#implementation ViewController
#synthesize txtName;
#synthesize lblMessage;
- (void)viewDidLoad
{
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
}
- (void)didReceiveMemoryWarning
{
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
- (IBAction)doSomething:(UIButton *)sender
{
[txtName resignFirstResponder];
NSString *msg = [[NSString alloc] initWithFormat:#"Hello, %#", txtName.text];
[lblMessage setText:msg];
//[msg release];
}
- (IBAction)makeKeyboardGoAway:(UIButton *)sender
{
[txtName resignFirstResponder];
}
- (BOOL)textFieldShouldReturn:(UITextField *)textField
{
[textField resignFirstResponder];
return YES;
}
#end
Here is the header file as well:
#import <UIKit/UIKit.h>
#interface ViewController : UIViewController
#property (weak, nonatomic) IBOutlet UITextField *txtName;
#property (weak, nonatomic) IBOutlet UILabel *lblMessage;
- (IBAction)doSomething:(UIButton *)sender;
- (IBAction)makeKeyboardGoAway:(UIButton *)sender;
#end
Well I got it working, but I still don't understand the error message I was getting.
Here is the code that worked for me.
Header:
#import <UIKit/UIKit.h>
#interface ViewController : UIViewController
{
IBOutlet UITextField *txtName;
IBOutlet UILabel *lblMessage;
}
#property (nonatomic, retain) IBOutlet UITextField *txtName;
#property (nonatomic, retain) IBOutlet UILabel *lblMessage;
- (IBAction)doSomething;
- (IBAction)makeKeyboardGoAway;
#end
Implementation:
#import "ViewController.h"
#implementation ViewController
#synthesize txtName;
#synthesize lblMessage;
- (IBAction)doSomething
{
[txtName resignFirstResponder];
NSString *msg = [[NSString alloc] initWithFormat:#"Hello, %#",
txtName.text];
[lblMessage setText:msg];
//[msg release];
}
- (IBAction) makeKeyboardGoAway
{
[txtName resignFirstResponder];
}
- (BOOL)textFieldShouldReturn:(UITextField *)textField
{
[textField resignFirstResponder];
return YES;
}
- (void)viewDidLoad
{
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
}
- (void)didReceiveMemoryWarning
{
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
#end

Answer 1

Call this method when the OK button is clicked.
[self.view endEditing:YES];

Answer 2

This works....if everything lines up with this it might be something else in your code....
...also be sure to have all objects linked correctly (VC to TextField and Button....Button back to VC)...that could also cause the crash
.h
#interface ViewController : UIViewController {
IBOutlet UIButton *button;
IBOutlet UITextField *textfield;
IBOutlet UILabel *label;
NSString *string;
}
-(IBAction)dismiss:(id)sender;
#property (nonatomic, retain)UIButton *button;
#property (nonatomic, retain)UITextField *textfield;
#property (nonatomic, retain)UILabel *label;
.m
#synthesize textfield, button, label;
-(IBAction)dismiss:(id)sender {
[textfield resignFirstResponder];
string = [NSString stringWithFormat:#"Hello %#", textfield.text];
[label setText:string];
}