singleton design pattern
singleton design pattern
- Subject: singleton design pattern
- From: Alejandro Marcos Aragón <email@hidden>
- Date: Tue, 18 May 2010 17:28:26 -0500
Hi all,
I've been staring at this piece of code now to try to find out what's wrong with it and I can't think of anything at this point. I'm trying to have a single instance of an NSMutableDictionary inside a class:
// in .h file
@interface ClassA : NSObject {
}
+ (NSMutableDictionary*) uniqueInstance;
@end
// in .m file
@implementation ClassA
+ (NSMutableDictionary*) uniqueInstance {
static NSMutableDictionary* uniqueInstance = nil;
if (uniqueInstance == nil) {
// directory to save files
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *dir = [paths objectAtIndex:0];
NSFileManager *fileManager = [NSFileManager defaultManager];
NSString *customFilePath = [[NSString alloc] initWithString:
[dir stringByAppendingPathComponent:@"dict.plist"]];
uniqueInstance = [[NSMutableDictionary alloc] initWithContentsOfFile:customFilePath];
}
return uniqueInstance;
}
I can't use this code because there is a EXC_BAD_ACCESS according to the debugger.
I tried moving the definition of the uniqueInstance outside the function and that didn't help. This code seems alright to me, but I can't find why it doesn't work. Can someone point out the problem?
aa
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