Pull To Refresh crashes app if I try to scroll while refreshing - ios

Question

I have implemented Pull to Refresh on my app but it crashes when I try to scroll while it is still refreshing. here is the code I'm using:
FYI, I'm calling webServices while refreshing.
In ViewDidLoad:
UIRefreshControl *refresh = [[UIRefreshControl alloc] init];
refresh.attributedTitle = [[NSAttributedString alloc] initWithString:#"Pull to Refresh"];
[refresh addTarget:self action:#selector(callWebService:) forControlEvents:UIControlEventValueChanged];
self.refreshControl = refresh;
[self callWebService:refresh];
Method for refresh:
-(void)callWebService:(UIRefreshControl *)refresh
{
static BOOL refreshInProgress = NO;
MessageWebServices *messageWebService = [[MessageWebServices alloc]init];
MessageBO *tempBO = [[MessageBO alloc]init];
if(self.flag)
{
self.navigationItem.title = #"My Posts";
tempBO.projectId = [AppConstants getProjectId];
tempBO.customerId =[AppConstants getCustomerId];
}
else
{
tempBO.projectId = [AppConstants getProjectId];
}
self.messageStore = [[NSMutableArray alloc] init];
if (!refreshInProgress)
{
refreshInProgress = YES;
refresh.attributedTitle = [[NSAttributedString alloc] initWithString:#"Refreshing"];
dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
self.messageStore = [messageWebService getMessageList:tempBO];
dispatch_async(dispatch_get_main_queue(), ^{
[refresh beginRefreshing];
[self.tableView reloadData];
[refresh endRefreshing];
refreshInProgress = NO;
});
});
}
}
Please Help!

Answer 1

I have never used beginRefreshing method. You can easily add refresh control to your tableView.
#pragma mark Refresh Method
-(void)startRefreshing {
if (!self.refreshControl) {
// Initialize the refresh control.
self.refreshControl = [[UIRefreshControl alloc] init];
self.refreshControl.backgroundColor = CRREFRESHBGCOLOR;
self.refreshControl.tintColor = [UIColor whiteColor];
[self.refreshControl addTarget:self action:#selector(callWebservice) forControlEvents:UIControlEventValueChanged];
[yourTable addSubview:self.refreshControl];//add refresh control to your table
}
}
-(void)endRefreshing {
if (self.refreshControl) {
NSDateFormatter *formatter = [[NSDateFormatter alloc] init];
[formatter setDateFormat:#"MMM d, h:mm a"];
NSString *title = [NSString stringWithFormat:#"Last update: %#", [formatter stringFromDate:[NSDate date]]];
NSDictionary *attrsDictionary = [NSDictionary dictionaryWithObject:[UIColor whiteColor]
forKey:NSForegroundColorAttributeName];
NSAttributedString *attributedTitle = [[NSAttributedString alloc] initWithString:title attributes:attrsDictionary];
self.refreshControl.attributedTitle = attributedTitle;
[self.refreshControl endRefreshing];
}
}
After calling/finishing web-service method call [self endRefreshing]; method and reload your table [yourTable reloadData].