How can I successfully dechiper Instruments Messages for iPhone Leak

Posted by dubbeat on Stack Overflow See other posts from Stack Overflow or by dubbeat
Published on 2010-03-25T09:00:15Z Indexed on 2010/03/25 9:03 UTC
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Hi,

I have a memory leak in my app. (This is the first of many I'm sure :()

I've being trying to use Instruments to find it. Instruments gives me a lot of information but I think I must just not know how to use this information.

What I did so far was

1) Run the app with Instruments 2) Memory Leak Occurs named general -stack 16 3) Find general - stack 16 in the object allocations part of instruments

4) The information here says the event type is a malloc, that webcore is responsible and the something named WKSetCurrentGraphicContext is the responsible caller.

How can I use this given information to discover where in my code the leak is being caused?

If I comment out the following function I don't get the leak warning so I guess it should be in there somewhere but I can't see where

-(void)constructFeatured
{       

    NSString *imageName =[[NSString alloc] initWithFormat:@"%@%@%@",@"http://myweb/avatar_", featuredValueObject.featured_promo_artistid, @".jpg"];
    NSURL *url = [NSURL URLWithString:imageName];
    CGRect frame;
    frame.size.width=100; frame.size.height=100;
    frame.origin.x=20; frame.origin.y=39;   
    [imageName release];
    imageName=nil;



    SDWebImageManager *manager = [SDWebImageManager sharedManager];

    UIImage *cachedImage = [manager imageWithURL:url];

    if (cachedImage)
    {
        cachedImage =[ImageManipulator makeRoundCornerImage:cachedImage : 10 : 10];
        UIImageView *avatarimageview = [[UIImageView alloc]initWithImage:cachedImage ];
        avatarimageview.frame=frame;
        [self.view addSubview:avatarimageview];
        UIView *spinny = [self.view viewWithTag:SPINNY_TAG];
        [spinny removeFromSuperview];
        [avatarimageview release];

    }
    else
    {

        [manager downloadWithURL:url delegate:self];
    }   
    NSURL *url2 =[NSURL URLWithString:[NSString stringWithFormat:@"%@%@%@",@"http://myweb/", 
                                       featuredValueObject.featured_promo_artistcountry
                                       , @".png"]];
    CGRect flagframe;
    flagframe.size.width=16; flagframe.size.height=11;
    flagframe.origin.x=130; flagframe.origin.y=40;  
    NSData* data = [[NSData alloc] initWithContentsOfURL:url2];
    UIImage* img = [[UIImage alloc] initWithData:data];




    UIImageView *imageflagview = [[UIImageView alloc] initWithImage: img];
    imageflagview.frame=flagframe;
    [self.view addSubview:imageflagview];
    [imageflagview release];
    imageflagview=nil;
    [data release];
    [img release];
    [url release];





    artistname =[[UILabel alloc]initWithFrame:CGRectMake(130,75, 200, 15)];
    [artistname setFont:[UIFont fontWithName:@"Arial" size:(16.0)]];
    artistname.backgroundColor= [UIColor clearColor];
    artistname.textColor=[UIColor whiteColor];
    artistname.text=featuredValueObject.featured_promo_artistname;
    [self.view addSubview:artistname];  
    [artistname release];



    hasConstructedFeatured=YES;

    [featuredValueObject release];
    featuredValueObject=nil;

}

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