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POSingleton shared data source in Objective-C
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  1. POSingleton shared data source in Objective-C
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    copied!<p>Hey folks - I'm writing a pretty simple iPhone application. The data comes from a plist file (NSDictionary basically), that I'm trying to load into a singleton class and use across my various view controllers to access the data.</p> <p>Here's the implementation for my singleton (heavily modeled after <a href="https://stackoverflow.com/questions/145154/what-does-your-objective-c-singleton-look-like">this thread</a>)</p> <pre><code>@implementation SearchData @synthesize searchDict; @synthesize searchArray; - (id)init { if (self = [super init]) { NSString *path = [[NSBundle mainBundle] bundlePath]; NSString *finalPath = [path stringByAppendingPathComponent:@"searches.plist"]; searchDict = [NSDictionary dictionaryWithContentsOfFile:finalPath]; searchArray = [searchDict allKeys]; } return self; } - (void)dealloc { [searchDict release]; [searchArray release]; [super dealloc]; } static SearchData *sharedSingleton = NULL; + (SearchData *)sharedSearchData { @synchronized(self) { if (sharedSingleton == NULL) sharedSingleton = [[self alloc] init]; } return(sharedSingleton); } @end </code></pre> <p>So whenever I try to access the searchDict or searchArray properties elsewhere in my application (like a TableView delegate) like so:</p> <pre><code>[[[SearchData sharedSearchData] searchArray] objectAtIndex:indexPath.row] </code></pre> <p>I get an exception stating *** -[NSCFSet objectAtIndex:]: unrecognized selector sent to instance 0x5551f0</p> <p>I'm not really sure why the objectAtIndex message is being sent to an NSCFSet object, I feel like my singleton is implemented wrong or something. I also tried a more complex singleton implementation like the one recommended by apple in the <a href="https://stackoverflow.com/questions/145154/what-does-your-objective-c-singleton-look-like">aforementioned thread</a> and had the same problem. Thanks for any insight you can provide.</p>
 

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