I have encountered an issue with the code below. I am utilizing NSOperationQueue to fetch post data from the server during the login process. My aim is to retrieve a response from the server 8 times. However, the implementation of NSOperationQueue seems to be malfunctioning as I sometimes encounter the following error:
*** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '*** -[__NSArrayM insertObject:atIndex:]: object cannot be nil'
self.operationQueue = [NSOperationQueue new];
NSInvocationOperation *operation = [[NSInvocationOperation alloc] initWithTarget:self
selector:@selector(getDataFromServer2)
object:nil];
[self.operationQueue addOperation:operation];
// The same procedure is repeated for executing the colorRotatorTask method.
...
Below is my JSON Code
- (void) getDataFromServer2 {
NSString *str = [NSString stringWithFormat:@"http://***********?”];
...
}
This piece of code is being used 8 times in total.