How to call a method once the completion block finish? - ios

Question

I want to call the signUp method first, once I got the userID, I need to call the another method normalSignupMethod.
[ConnectionObj signUp:user];
[helper normalSignupMethod:dict];
signUp Method:
[MYRequest signUp:user successBlock:^(QBResponse *response, QBUUser *user) {
// Sign up was successful
// Store user id
[SingletonClass sharedMySingleton].userID = [NSString stringWithFormat:#"%#",response.data[#"id"]];
} errorBlock:^(QBResponse *response) {
// Handle error here
NSLog(#" error in creating session %#", response.error);
[SVProgressHUD showErrorWithStatus:NSLocalizedString(#"SignUp to Chat error!", nil)];
}];
This I how I have called:
dispatch_group_t group = dispatch_group_create();
dispatch_group_async(group,dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_HIGH, 0), ^ {
NSLog(#"Block1");
[ConnectionObj signUp:user];
});
dispatch_group_notify(group,dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_HIGH, 0), ^ {
NSLog(#"Group notify");
[helper normalSignupMethod:dict];
dispatch_async(dispatch_get_main_queue(), ^{
[SVProgressHUD dismiss];
});
});
Block 1 executed first, and then group notify called. But I'm getting the userID after the normalSignupMethod is finished. How to wait for a signUp method to get userID before calling the normalSignupMethod?

Answer 1

You can create a block with your signUp method like this and pass the Bool completion value to check is it called successfully or not. So change your method declaration like this.
-(void)signUp:(QBUser*)user andHandler:(void (^)(BOOL result))completionHandler;
And its definition
-(void)signUp:(QBUser*)user andHandler:(void (^)(BOOL result))completionHandler {
[MYRequest signUp:user successBlock:^(QBResponse *response, QBUUser *user) {
[SingletonClass sharedMySingleton].userID = [NSString stringWithFormat:#"%#",response.data[#"id"]];
completionHandler(YES);
} errorBlock:^(QBResponse *response) {
// Handle error here
NSLog(#" error in creating session %#", response.error);
[SVProgressHUD showErrorWithStatus:NSLocalizedString(#"SignUp to Chat error!", nil)];
completionHandler(NO);
}];
}
Now call this method like this.
[ConnectionObj signUp:user andHandler:^(BOOL result) {
if(result) {
[helper normalSignupMethod:dict];
}
}];

Answer 2

You can call the normalSignupMethod once the signUp:successBlock request returns to successBlock
[MYRequest signUp:user successBlock:^(QBResponse *response, QBUUser *user) {
// Sign up was successful
// Store user id
[SingletonClass sharedMySingleton].userID = [NSString stringWithFormat:#"%#",response.data[#"id"]];
//call the signup method
[helper normalSignupMethod:dict];
} errorBlock:^(QBResponse *response) {
// Handle error here
NSLog(#" error in creating session %#", response.error);
[SVProgressHUD showErrorWithStatus:NSLocalizedString(#"SignUp to Chat error!", nil)];
}];