Obj-c - Crash when passing data to detailview? - ios

Question

I'm passing data from my ViewController to a detailViewController with the below code, however no matter what I seem to do, my app crashes at the line
self.username.text = self.mapuserData[#"users_name"];
with the following error (even though data is present in self.mapuserData)? Help!
Terminating app due to uncaught exception
'NSInvalidArgumentException', reason: '-[__NSArrayI
objectForKeyedSubscript:]: unrecognized selector sent to instance
0x17126b840'
ViewController.m
- (void)mapView:(MKMapView *)mapView didSelectAnnotationView:(MKAnnotationView *)view
{
UITapGestureRecognizer *tapGesture = [[UITapGestureRecognizer alloc] initWithTarget:self action:#selector(calloutTapped:)];
[view addGestureRecognizer:tapGesture];
}
-(void)calloutTapped:(UITapGestureRecognizer *) sender
{
UIStoryboard *storyboard = [UIStoryboard storyboardWithName:#"Main" bundle:nil];
OtherUserViewController *yourViewController = (OtherUserViewController *)[storyboard instantiateViewControllerWithIdentifier:#"OtherUserViewController"];
NSMutableDictionary *dictionary = [self.addressData mutableCopy];
yourViewController.mapuserData = dictionary; // this is how you do it
[self.navigationController pushViewController:yourViewController animated:YES];
}
OtherViewController.m (detailview)
- (void)viewDidLoad {
[super viewDidLoad];
if ([self.mapuserData count] > 0) {
NSLog(#"This is map user data %#", self.mapuserData);
self.addFriend.hidden = NO;
self.username.text = self.mapuserData[#"users_name"];
self.userBio.text = self.mapuserData[#"userbio"];
NSString *thirdLink = self.mapuserData[#"photo_path"];
NSString *ImageURLTwo = thirdLink;
NSData *imageDataTwo = [NSData dataWithContentsOfURL:[NSURL URLWithString:ImageURLTwo]];
self.userPhoto.image = [[UIImage alloc] initWithData:imageDataTwo];
}
}
Here's what's in self.mapuserData:
This is map user data (
{
address = "2957 fake street";
childrenunder = Yes;
city = Vancouver;
"emergency facility" = None;
"first name" = josh;
"last name" = tree;
phone = 6046710890;
"photo_path" = "http://url.ca/paw.png";
"points balance" = 24;
"postal code" = b6b6v5;
"profile photo" = "<null>";
"property type" = Apartment;
province = bc;
"special skills" = "Medication";
"star rating" = 0;
"street_address" = none;
supervision = Yes;
uid = 182;
userbio = nfkkdkckmfkekxkx;
"users_name" = "josh_tree#hotmail.com";

Answer 1

Create your own class to store index of the Annotation data source. Which is subclass of MKPointAnnotation
PointAnnotation.h
#import <UIKit/UIKit.h>
#import <MapKit/MapKit.h>
#interface PointAnnotation : MKPointAnnotation
#property (nonatomic, assign)int index;
#end
PointAnnotation.m
#import "PointAnnotation.h"
#implementation PointAnnotation
#end
Change your Add Annotation code like below
int index = 0; //Index to track the data source index while select the annotation call out view.
for (NSMutableDictionary *multiplelocations in self.addressData) {
NSString *location = multiplelocations[#"street_address"];
NSLog(#"Pull addresses %#", location);
NSString *userNames = multiplelocations[#"users_name"];
NSString *userBio = multiplelocations[#"userbio"];
CLGeocoder *geocoder = [[CLGeocoder alloc] init];
[geocoder geocodeAddressString:location
completionHandler:^(NSArray* placemarks, NSError* error){
if (placemarks && placemarks.count > 0) {
CLPlacemark *topResult = [placemarks objectAtIndex:0];
MKPlacemark *placemark = [[MKPlacemark alloc] initWithPlacemark:topResult];
MKCoordinateRegion region = self.mapView.region;
region.span.longitudeDelta /= 8.0;
region.span.latitudeDelta /= 8.0;
PointAnnotation *point = [[PointAnnotation alloc] init];
point.coordinate = placemark.coordinate;
point.title = userNames;
point.subtitle = userBio;
point.index = index; // Store index here.
[self.mapView addAnnotation:point];
}
}
];
index = index + 1;
}
And modify your didSelectAnnotationView code like below
- (void)mapView:(MKMapView *)mapView didSelectAnnotationView:(MKAnnotationView *)view {
//Get the annotation object from callout view.
PointAnnotation *selectedPoint = (PointAnnotation *) view.annotation;
UIStoryboard *storyboard = [UIStoryboard storyboardWithName:#"Main" bundle:nil];
OtherUserViewController *yourViewController = (OtherUserViewController *)[storyboard instantiateViewControllerWithIdentifier:#"OtherUserViewController"];
//Get the dictionary from array by using the index of the custom PointAnnoation object.
NSMutableDictionary *dictionary = self.addressData[selectedPoint.index];
yourViewController.mapuserData = dictionary;
[self.navigationController pushViewController:yourViewController animated:YES];
}
You are assigning an Array to Dictionary which is wrong.
NSMutableDictionary *dictionary = [self.addressData mutableCopy];
yourViewController.mapuserData = dictionary;

Answer 2

The Dictionary you are expecting is the array type at the run time so you need change the code above
NSMutableDictionary *dictionary = [self.addressData[0] mutableCopy];
change addressData to NSArray

Answer 3

self.mapuserData is no more deserializes into dictionary, It is deserializes into array.
So what you want to do is:
Get an object from zero index form self.mapuserData and then save as dictionary.
Example : NSDictionary *dict = self.mapuserData[0];
self.mapuserData should be type of array.