How to loop through arrays - ios

Question

Now I loop through one Array at once and calculate distance like this:
- (void)calculateDistance
{
ann = [dict objectForKey:#"Blue"];
for(int i = 0; i < [ann count]; i++) {
NSString *coordinates = [[ann objectAtIndex:i] objectForKey:#"Coordinates"];
double realLatitude = [[[coordinates componentsSeparatedByString:#","] objectAtIndex:1] doubleValue];
double realLongitude = [[[coordinates componentsSeparatedByString:#","] objectAtIndex:0] doubleValue];
// Calculating distance
CLLocation *pinLocation = [[CLLocation alloc]
initWithLatitude:realLatitude
longitude:realLongitude];
CLLocation *userLocation = [[CLLocation alloc]
initWithLatitude:mapView.userLocation.coordinate.latitude
longitude:mapView.userLocation.coordinate.longitude];
CLLocationDistance distance = [pinLocation distanceFromLocation:userLocation];
// Adding distance to dictionaries
if (distance > 1000) {
NSString *dist = [NSString stringWithFormat:#"%.2f km.", distance/1000];
NSMutableDictionary *inDict = [[NSMutableDictionary alloc] init];
inDict = [ann objectAtIndex:i];
[inDict setValue:dist forKey:#"Distance"];
}
else{
NSString *dist = [NSString stringWithFormat:#"%4.0f m.", distance];
NSMutableDictionary *inDict = [[NSMutableDictionary alloc] init];
inDict = [ann objectAtIndex:i];
[inDict setValue:dist forKey:#"Distance"];
}
}
}
My data structure is:
How to loop through all Array's at once? I have Array which contains all my Array's named "resultArray", but this code doesn't work:
ann = [dict objectForKey:resultArray];
NSLog(#"%#", resultArray);
2013-05-05 10:57:03.643 testApp[5708:907] (
Black,
Green,
Orange,
Blue,
Darkblue
)

Answer 1

I guess you want to enumerate through the keys stored in resultArray and calculate the distance and add that calculated values to it.
- (void)calculateDistance
{
//Enumerates through resultArray
for (NSString *key in resultArray) {
//ann array is considered as an instance of NSMutableArray
ann = dict[key];
for(int i = 0; i < [ann count]; i++) {
NSMutableDictionary *inDict = [ann[i] mutableCopy];
NSString *coordinates = inDict[#"Coordinates"];
NSArray *coordinateComponents = [coordinates componentsSeparatedByString:#","];
double realLatitude = [coordinateComponents[1] doubleValue];
double realLongitude = [coordinateComponents[0] doubleValue];
// Calculating distance
CLLocation *pinLocation = [[CLLocation alloc] initWithLatitude:realLatitude
longitude:realLongitude];
CLLocation *userLocation = [[CLLocation alloc]
initWithLatitude:mapView.userLocation.coordinate.latitude
longitude:mapView.userLocation.coordinate.longitude];
CLLocationDistance distance = [pinLocation distanceFromLocation:userLocation];
// Adding distance to dictionaries
if (distance > 1000) {
NSString *dist = [NSString stringWithFormat:#"%.2f km.", distance/1000];
[inDict setValue:dist forKey:#"Distance"];
}
else{
NSString *dist = [NSString stringWithFormat:#"%4.0f m.", distance];
[inDict setValue:dist forKey:#"Distance"];
}
//Inserting the modified values to the main array
[ann replaceObjectAtIndex:i withObject:inDict];
}
}
}

Answer 2

ann = [dict objectForKey:resultArray];
for(NSArray *colourArray in ann)
{
for(NSDictionary *itemDictionary in colourArray)
{
NSLog(#"Coordinates = %#",[itemDictionary objectForKey:#"Coordinates"]);
NSLog(#"Name = %#",[itemDictionary objectForKey:#"Name"]);
NSLog(#"Address = %#",[itemDictionary objectForKey:#"Address"]);
}
}
Hope it will help you .