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PONSMutableArray resetting itself when WindowDidLoad is done
 

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  1. PONSMutableArray resetting itself when WindowDidLoad is done
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    <p>When I pass a NSMutableArray from a controller class to a NSWindowController class using <code>@property</code> and <code>@synthesize</code> I am able to use the objects of the array in the <code>windowDidLoad</code> method. However, after the method is done and I click a button on the window triggerig an <code>IBAction</code>, the passed value is <code>nil</code>.</p> <p>Can anyone explain me why this is happening and how I can preserve the NSMutableArray?</p> <p>Here is the code:</p> <p><strong>passClass.h</strong></p> <pre><code>#import &lt;Foundation/Foundation.h&gt; @class ResultWindowController; @interface passClass : NSObject { @private IBOutlet NSTextField *searchField; ResultWindowController *resultWindowController; } - (IBAction)passIt:(id)sender; @end </code></pre> <p><strong>passClass.m</strong></p> <pre><code>#import "passClass.h" #import "ResultWindowController.h" @implementation passClass - (IBAction)passIt:(id)sender { NSString *searchString = searchField.stringValue; NSMutableArray array = [[NSMutableArray alloc]init]; [array addObject:searchString]; [array addObject:searchString]; if(!resultWindowController) { resultWindowController = [[ResultWindowController alloc] initWithWindowNibName:@"ResultWindow"]; resultWindowController.array =[[NSMutableArray alloc]initWithArray:array copyItems:YES]; [resultWindowController showWindow:self]; } } @end </code></pre> <p><strong>ResultWindowController.h</strong></p> <pre><code>#import &lt;Cocoa/Cocoa.h&gt; @interface ResultWindowController : NSWindowController &lt;NSTableViewDataSource&gt; { IBOutlet NSTableView *resultView; NSMutableArray *resultList; //NSMutableArray *array; } - (IBAction)returnValue:(id)sender; @property (nonatomic,strong) NSMutableArray *array; @end </code></pre> <p><strong>ResultWindowController.m</strong></p> <pre><code>#import "Results.h" @interface ResultWindowController () @end @implementation ResultWindowController //@synthesize array; - (id)initWithWindow:(NSWindow *)window { self = [super initWithWindow:window]; if (self) { // Initialization code here. resultList = [[NSMutableArray alloc] init]; } return self; } - (void)windowDidLoad { [super windowDidLoad]; for (NSInteger i = 0; i&lt; [array count];i++) { Results *result = [[Results alloc]init]; result.resultName = [self.array objectAtIndex:i]; [resultList addObject:result]; [resultView reloadData]; NSLog (@"self.array: %@", self.array); // works fine, tableview gets populated, array is correct } } - (NSInteger) numberOfRowsInTableView:(NSTableView *)resultView{ return [resultList count]; } - (id)tableView:(NSTableView *)resultView objectValueForTableColumn:(NSTableColumn *)resultColumn row:(NSInteger)row{ Results *result = [resultList objectAtIndex:row]; NSString *identifier = [resultColumn identifier]; return [result valueForKey:identifier]; } - (IBAction)selectedSeries:(id)sender { NSLog (@"self.array: %@", self.array); //when I break here the array is nil } @end </code></pre> <p>Here is the NSLog result:</p> <pre><code>2013-12-26 10:36:49.487 MyProgram[545:303] self.array: ( "test", "test" ) 2013-12-26 10:37:24.044 MyProgram[545:303] self.array: (null) </code></pre>
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    1. USLotzki
    1. USLotzki
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    1. This table or related slice is empty.
    1. COPut break point or nslog to debug it. and check its value when it becomes nil.
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      1. PONSMutableArray resetting itself when WindowDidLoad is done
      1. USToseef Khilji
    2. COI did put a break point at the end of the windowDidLoad method, the NSMutableArray still exists. After that, no code is executed before I press the button. Here is where I put my next break point and the NSMutableArray is nil.
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      1. PONSMutableArray resetting itself when WindowDidLoad is done
      1. USLotzki
    3. COshow us your button click method.
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      1. USToseef Khilji
 

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