Sorting an array for UITableView - ios

Question

I have a function which prepares data for my UITableView:
- (void) SearchFromMyPosition {
TitleLabelSort = [[NSMutableArray alloc] init];
DistanceLabelSort = [[NSMutableArray alloc] init];
TagValueSort = [[NSMutableArray alloc] init];
DistanceUnitSort = [[NSMutableArray alloc] init];
LatArraySort = [[NSMutableArray alloc] init];
LngArraySort = [[NSMutableArray alloc] init];
// loading
[activityIndicatorObject startAnimating];
NSNumber *latNr1 = [[NSUserDefaults standardUserDefaults] valueForKey:#"api_lat"];
NSNumber *lngNr1 = [[NSUserDefaults standardUserDefaults] valueForKey:#"api_lng"];
double lat1 = [latNr1 doubleValue];
double lng1 = [lngNr1 doubleValue];
dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
NSArray *array = [APIConnection GetDataFromUrlAuth];
dispatch_async(dispatch_get_main_queue(), ^{
for (NSString *item in array) {
NSArray *coords = [[[array valueForKey:item] valueForKey:#"location"] componentsSeparatedByString:#"|"];
double lat2 = [[coords objectAtIndex:0] doubleValue];
double lng2 = [[coords objectAtIndex:1] doubleValue];
CLLocation *oldLocation = [[CLLocation alloc] initWithLatitude:lat1 longitude:lng1];
CLLocation *newLocation = [[CLLocation alloc] initWithLatitude:lat2 longitude:lng2];
CLLocationDistance meters = [newLocation distanceFromLocation:oldLocation];
[LatArraySort addObject:[NSString stringWithFormat:#"%f",lat2]];
[LngArraySort addObject:[NSString stringWithFormat:#"%f",lng2]];
[TitleLabelSort addObject:[[array valueForKey:item] valueForKey:#"name"]];
[DistanceLabelSort addObject:[NSString stringWithFormat:#"%f",meters]];
[TagValueSort addObject:item];
[self.myTableView reloadData];
[activityIndicatorObject stopAnimating];
}
});
});
}
This works but I need to sort results by DistanceLabelSort
For sorting CoreData results I use below function and works fine:
- (void) SetTableData {
TitleLabel = [[NSMutableArray alloc] init];
DistanceLabel = [[NSMutableArray alloc] init];
TagValue = [[NSMutableArray alloc] init];
DistanceUnit = [[NSMutableArray alloc] init];
LatArray = [[NSMutableArray alloc] init];
LngArray = [[NSMutableArray alloc] init];
// sorting
NSArray *sortedArray = [DistanceLabelSort sortedArrayUsingComparator:^(NSString *str1, NSString *str2) {
return [str1 compare:str2 options:NSNumericSearch];
}];
NSString *sortIdentStr = [[NSString alloc] init];
unsigned long sortIdent;
NSMutableArray *arrayUnit = [[NSMutableArray alloc] init];
for (int i = 0; i < sortedArray.count; i++) {
sortIdentStr = [sortedArray objectAtIndex:i];
sortIdent = [DistanceLabel indexOfObject:sortIdentStr];
arrayUnit = [self unitStr:sortIdentStr];
[TitleLabel addObject:[TitleLabelSort objectAtIndex:sortIdent]];
[TagValue addObject:[TagValueSort objectAtIndex:sortIdent]];
[LatArray addObject:[LatArraySort objectAtIndex:sortIdent]];
[LngArray addObject:[LngArraySort objectAtIndex:sortIdent]];
[DistanceLabel addObject:[arrayUnit objectAtIndex:0]];
[DistanceUnit addObject:[arrayUnit objectAtIndex:1]];
[self.myTableView reloadData];
[activityIndicatorObject stopAnimating];
}
}
But if I try use this for sorting data from external api function SetTableData is done before I get results from external api.

Answer 1

Finally I found solution and maybe this will be helpful for others:
I added function which checks if the task is done:
- (void)SearchFromMyPositionWithSuccess:(void (^)(void))successHandler failure:(void (^)(void))failureHandler {
TitleLabelSort = [[NSMutableArray alloc] init];
DistanceLabelSort = [[NSMutableArray alloc] init];
TagValueSort = [[NSMutableArray alloc] init];
DistanceUnitSort = [[NSMutableArray alloc] init];
LatArraySort = [[NSMutableArray alloc] init];
LngArraySort = [[NSMutableArray alloc] init];
// loading
[activityIndicatorObject startAnimating];
NSNumber *latNr1 = [[NSUserDefaults standardUserDefaults] valueForKey:#"api_lat"];
NSNumber *lngNr1 = [[NSUserDefaults standardUserDefaults] valueForKey:#"api_lng"];
double lat1 = [latNr1 doubleValue];
double lng1 = [lngNr1 doubleValue];
dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
NSArray *array = [APIConnection GetDataFromUrlAuth];
dispatch_async(dispatch_get_main_queue(), ^{
int i = 0;
for (NSString *item in array) {
i++;
NSArray *coords = [[[array valueForKey:item] valueForKey:#"location"] componentsSeparatedByString:#"|"];
double lat2 = [[coords objectAtIndex:0] doubleValue];
double lng2 = [[coords objectAtIndex:1] doubleValue];
CLLocation *oldLocation = [[CLLocation alloc] initWithLatitude:lat1 longitude:lng1];
CLLocation *newLocation = [[CLLocation alloc] initWithLatitude:lat2 longitude:lng2];
CLLocationDistance meters = [newLocation distanceFromLocation:oldLocation];
[LatArraySort addObject:[NSString stringWithFormat:#"%f",lat2]];
[LngArraySort addObject:[NSString stringWithFormat:#"%f",lng2]];
[TitleLabelSort addObject:[[array valueForKey:item] valueForKey:#"name"]];
[DistanceLabelSort addObject:[NSString stringWithFormat:#"%f",meters]];
[TagValueSort addObject:item];
if (i == array.count) {
successHandler();
}
[activityIndicatorObject stopAnimating];
}
});
});
}
And wait for success in this function:
-(void) SearchFromMyPosition {
[self SearchFromMyPositionWithSuccess: ^{
[self SetTableData];
NSLog(#"success");
} failure:^{
NSLog(#"failure");
}];
}
This solves my case :)