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POretain array data outside of method objective-c
 

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    <p><strong>I have an array, <code>players</code>, with two strings inside it: <code>player1</code> and <code>player2</code>. Here is my .h file:</strong></p> <pre><code>#import &lt;UIKit/UIKit.h&gt; @interface hardOne : UIViewController { UISwitch *hard1ON; NSMutableArray *players; NSString *player1, *player2; } @property (nonatomic, retain) IBOutlet UISwitch *hard1ON; @property (nonatomic) BOOL switchState; @property (nonatomic, retain) NSMutableArray *players; - (IBAction) switchValueChanged; @end </code></pre> <p><strong>The array is initialized in the viewDidLoad then the data is entered into that array in two IBActions in my .m file:</strong></p> <pre><code>#import "hardOne.h" @interface hardOne () &lt;UITextFieldDelegate&gt; @property (nonatomic, strong) IBOutlet UITextField *textFieldOne; @property (nonatomic, strong) IBOutlet UITextField *textFieldTwo; @end @implementation hardOne @synthesize hard1ON; @synthesize players; @synthesize textFieldOne; @synthesize textFieldTwo; BOOL switchState; int counter = 0; - (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil { self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil]; if (self) { // Custom initialization } return self; } - (void)viewDidLoad { [super viewDidLoad]; [hard1ON setOn:switchState animated:NO]; //read player names to user defaults [textFieldOne setText:[[NSUserDefaults standardUserDefaults] stringForKey:@"player1"]]; [textFieldTwo setText:[[NSUserDefaults standardUserDefaults] stringForKey:@"player2"]]; self.players = [[NSMutableArray alloc] init]; NSLog(@"%@",self.players); } - (void)didReceiveMemoryWarning { [super didReceiveMemoryWarning]; // Dispose of any resources that can be recreated. } - (IBAction) switchValueChanged { counter += 1; if (counter % 2 == 0) { switchState = 0; } else { switchState = 1; } if (hard1ON.on) { [[NSNotificationCenter defaultCenter] postNotificationName:@"theChange" object:nil]; } else { [[NSNotificationCenter defaultCenter] postNotificationName:@"theChange2" object:nil]; } } - (IBAction) returnKey1 { player1 = [textFieldOne text]; [self.players addObject:(player1)]; //set player1's name to user defaults [[NSUserDefaults standardUserDefaults] setValue:[textFieldOne text] forKey:@"player1"]; } - (IBAction) returnKey2 { player2 = [textFieldTwo text]; [self.players addObject:(player2)]; //set player2's name to user defaults [[NSUserDefaults standardUserDefaults] setValue:[textFieldTwo text] forKey:@"player2"]; } - (BOOL)textFieldShouldReturn:(UITextField *)textField { [textField resignFirstResponder]; return NO; } @end </code></pre> <p>If I use <code>NSLog</code> in the second IBAction, once it is complete, the array is correctly displayed in the console with the strings <code>player1</code> and <code>player2</code>, however if I try to use the array anywhere else it is <code>null</code>. Could anyone point me in the right direction?</p>
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    1. USuser2178970
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    1. COHow is `player1` and `player2` defined in your class? Why do you need these properties at all if you store them into the array? Also, it is usually advisable to use `self.` to access properties, e.g `self.players = ...`.
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      1. USmrueg
    2. COwhat do you mean anywhere else? Pls add code for the entire .h and .m file. Also, are you using ARC
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      1. USTushar Koul
    3. COThinking about it you're correct, they're unnecessary variables. How come that's advisable? Either way the `player1` and `player2` variables don't affect the array becoming null in other methods, do they?
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