IOS start up project

Hello there,

I am start up with iOS develop, on the apple site, I found a working sample code, this code can close keypad by delication, but I cannot make it work when click on button.

I try to add following code in the button click event, but it is not working with error.

 [self.TextField resignFirstResponder];

Please help me understand what need to be changed and what am I doing wrong? Appreciate your time and help.

I have trying to find books of Xcode 5, but most of the books in Amazon is not released yet, can I buy a book target xcode 4 and start from there?

//  ViewController.h
//  HelloTest
//  Created by Patrick Au on 9/26/13.
//  Copyright (c) 2013 Patrick Au. All rights reserved.

#import <UIKit/UIKit.h>

@interface ViewController : UIViewController <UITextFieldDelegate>
- (IBAction)ChangeGreetings:(id)sender;

@property (strong, nonatomic) IBOutlet UITextField *TextField;
@property (strong, nonatomic) IBOutlet UILabel *label;

@property (copy,nonatomic) NSString *UserName;



//  ViewController.m
//  HelloTest
//  Created by Patrick Au on 9/26/13.
//  Copyright (c) 2013 Patrick Au. All rights reserved.

#import "ViewController.h"

@interface ViewController ()


@implementation ViewController

- (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)ChangeGreetings:(id)snder {
   // [self.TextField resignFirstResponder];
    self.UserName = self.TextField.text;
    NSString *nameString = self.UserName;
    if ([nameString length] == 0) {
        nameString = @"World";
    NSString *greeting = [[NSString alloc] initWithFormat:@"Hello, %@!", nameString];
    self.label.text = greeting;

-(BOOL) textFieldShouldReturn: (UITextField *) TextField{
    if (TextField == self.TextField) {
        [TextField resignFirstResponder];
    return YES;

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Your question is very similar to another here in the forum.

Look at step 3 and try it.

In my opinion most book on iOS are somewhat or somehow out of date all the time because of the speed of new versions.  Books on 4 and 5 would be ok for many things and to get the basics, but anything new in 6 or 7 of course will be missing.

You should look at the changes and decide if it is worthwhile.  Because of the major changes in 5 and 6 I would suggest you look at finding a general book for 6.

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tomcattyyAuthor Commented:
Thanks  darbid73,

That solve the issue, and it is a more complete way than resign FirstResponder.

After correct synthesize the parameter, [self.TextField resignFirstResponder] is also work.  I already order the updated books for continue study.
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