objective c - Instance variable s3 accessed in class method -

i m uploading images in amazon s3 bucket.i m writing code in seperate class amazons3, m getting error instance variable s3 accessed in class method.how solve error .i m creating constructor variable initialization.could guys me out.

-(id) init    {     self = [super init];     if(self)     {          if(self.s3 == nil)         {             // initial s3 client.             self.s3 = [[amazons3client alloc] initwithaccesskey:access_key_id withsecretkey:secret_key];         }     }     return self; }   +(void)uploadimage:(products *)product  {      nsdata *uploaddata = [nsdata datawithcontentsoffile:[util getfilepathforfilename:[nsstring stringwithformat:@"%@ios.mp4",product.productimageurl]]];     s3putobjectrequest *por = [[s3putobjectrequest alloc] initwithkey:[nsstring stringwithformat:@"%@.mp4",product.productimageurl] inbucket:bucket_name];     por.contenttype = @"application/octet-stream";     por.cannedacl   = [s3cannedacl publicread];     por.data = uploaddata;     s3putobjectresponse *putobjectresponse = [s3 putobject:por];     if(putobjectresponse.error !=nil)     [self performselectoronmainthread:@selector(showcheckerrormessage:) withobject:putobjectresponse.error  waituntildone:no];  } 

your uploadimage: must instance method. change signature -(void)uploadimage:(products *)product.

your error quite self-explaining : instance attribute (per-object) cannot accessed in class method (per-class). need instanced object access object attribute ;)