Question

I have a singleton class and the lines in the init method cause memory leak, and I don’t kwno why…

this is my implementation

static timerController *sngTimer = nil;

@implementation timerController

@synthesize repeatingTimer;
@synthesize dateComp;
@synthesize bPause;

+(timerController *) singletonTimer
{
    @synchronized(self){
        if (sngTimer == nil ) 
        {
            sngTimer = [[timerController alloc]init];
        }
    }

    return sngTimer;
}

-(id)init
{
    self = [super init];

    if (self != nil) {

        dateComp = [[NSDateComponents alloc] init];         ///this line cause memory leak
        NSCalendar *gregorianCalendar = [[NSCalendar alloc] initWithCalendarIdentifier:NSGregorianCalendar]; ///this line cause memory leak

        [dateComp setCalendar:gregorianCalendar]; ///this line cause memory leak

        [gregorianCalendar release];

        bPause = FALSE;
    }

    return self;
}

Answer 1

I don’t know how you’re detecting the leak, but most likely whatever tool you’re using notices that you don’t have a dealloc method to release the object you create there. You probably should have it for completeness, but as long as the class is only used as a singleton, it doesn’t really matter.