Singleton Property causing App crash - objective-c

Question

I have a singelton class which is used to pull and store all data from a Web Service. The class has an NSArray and an NSDictionary which stores the data. I then want to use this data to populate tableviews in other views.
In one of my views, within the View Did Load method, I tell the singleton to retrieve the data from the web service and store it (it successfully retrieves the data, I logged it). I then try to access the data like so:
[[ClubData initClubData] memberData];
If I try to use that to populate the table view, it crashes and keeps referencing some kind of view. One time it referenced CALayer, another time a WrapperView ??? Am I not doing something right
My Singleton:
#import "ClubData.h"
#import "JSON.h";
#implementation ClubData
#synthesize conn, response, url, api_calls, memberData, beerData, call;
static ClubData *globalClubData = nil;
#pragma mark -
#pragma mark Instance Methods
- (void)getBeerData {
}
- (void)getSingleBeer:(NSInteger *)beerID {
}
- (void)getClubData {
//check for existing data
if (memberData != nil)
return;
//init
memberData = [[NSArray alloc] init];
//create request
call = #"memberlist";
[self initRequest:#"memberlist"];
}
- (void)getMemberData:(NSInteger *)memberID {
}
- (void)parseData:(NSString *)json {
//parse based on call type
if (call == #"memberlist") {
memberData = [[NSDictionary alloc] init];
memberData = [json JSONValue];
}
//reset call
[call release];
call = nil;
}
#pragma mark -
#pragma mark Connection & Delegate
- (void)initRequest:(NSString *)type {
//build url
NSMutableString *rURL = [[NSMutableString alloc] initWithString:url];
[rURL appendString:[api_calls objectForKey:type]];
NSURL *tempURL = [[NSURL alloc] initWithString:rURL];
[rURL release];
//init request & create connection
NSURLRequest *request = [[[NSURLRequest alloc] initWithURL:tempURL] autorelease];
conn = [[NSURLConnection alloc] initWithRequest:request delegate:self];
[tempURL release];
//init response
response = [[NSMutableData alloc] init];
}
//receive data
- (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data {
[response appendData:data];
}
//connection complete
- (void)connectionDidFinishLoading:(NSURLConnection *)connection {
//release conn
[conn release];
//parse JSON
NSString *json = [[NSString alloc] initWithData:response encoding:NSUTF8StringEncoding];
[response release];
//parse
[self parseData:json];
[json release];
}
//connection failed
- (void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error {
UIAlertView *alert = [[UIAlertView alloc] initWithTitle:#"Connection Error"
message:#"Unable to connect to network. Network required to load data."
delegate:nil cancelButtonTitle:#"Ok" otherButtonTitles:nil];
[alert show];
[alert release];
}
#pragma mark -
#pragma mark Singleton Control
+ (ClubData *)initClubData {
if (globalClubData == nil) {
#synchronized(self) {
globalClubData = [[super allocWithZone:NULL] init];
}
}
return globalClubData;
}
- (id)init {
if (self = [super init]) {
//set url
url = [[[NSString alloc] initWithString:#"https://myurl.com/path/to/script.php?action=get_app_data"] retain];
//possible calls
NSArray *keys = [[NSArray alloc] initWithObjects:#"beerlist", #"singlebeer", #"memberlist", nil];
NSArray *objs = [[NSArray alloc] initWithObjects:#"&subaction=beerlist", #"&subaction=singlebeer&beerID=", #"&subaction=memberlist", nil];
api_calls = [[[NSDictionary alloc] initWithObjects:objs forKeys:keys] retain];
[keys release];
[objs release];
}
return self;
}
#pragma mark -
#pragma mark Lifecycle
- (void)dealloc {
[conn release];
[response release];
[url release];
[call release];
[api_calls release];
[super dealloc];
}
#end

Answer 1

api_calls = [[[NSDictionary alloc] initWithObjects:objs forKeys:keys] retain];
do not retain it (you are already an owner of that object).
As for the crash - post the stack trace.
Edit: Probably found:
if (call == #"memberlist") {
memberData = [[NSDictionary alloc] init]; //remove this (it is redundant and causes leak)
memberData = [json JSONValue]; //retain this
}