Passing Co-ordinates from one view to another - ios

Question

Now i am updating the code with the perfect output. This may help my friends to place the correct markers.
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placevcViewController.h
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#import
#import "fetchurl.h"
#import
#interface placevcViewController : UIViewController
{
CLLocationDegrees lat;
CLLocationDegrees lng;
CLLocationCoordinate2D local;
}
-(id)init;
-(void)location:(CLLocationManager *)address;
#property (nonatomic, strong) NSDictionary *location;
#property (strong, nonatomic) UITextField *addressfeild;
#property (strong, nonatomic) fetchurl *fu;
#property (strong, nonatomic) GMSMapView *map;
#property (strong, nonatomic) CLLocationManager *locationManager;
#property (strong, nonatomic) GMSCameraPosition *camera;
#end
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placevcViewController.m
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#import "placevcViewController.h"
#interface placevcViewController ()
#end
#implementation placevcViewController
#synthesize addressfeild, map,fu,locationManager,camera;
-(id)init
{
self = [super init];
location = [[NSDictionary alloc] initWithObjectsAndKeys:#"0.0",#"lat",#"0.0",#"lng",#"Null Island",#"adress",#"NULL Home",#"name", nil];
return self;
}
- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
if (self) {
// Custom initialization
}
return self;
}
- (void)viewDidLoad
{
[super viewDidLoad];
locationManager = [[CLLocationManager alloc] init];
locationManager.distanceFilter = kCLDistanceFilterNone; // whenever we move
locationManager.desiredAccuracy = kCLLocationAccuracyHundredMeters; // 100 m
[locationManager startUpdatingLocation];
lat = locationManager.location.coordinate.latitude;
lng = locationManager.location.coordinate.longitude;
local = CLLocationCoordinate2DMake(lat, lng);
fu = [[fetchurl alloc]init];
camera = [GMSCameraPosition cameraWithLatitude:lat longitude: lng zoom:12];
map = [GMSMapView mapWithFrame:CGRectMake(0, 60, 320, 480) camera:camera];
[self.view addSubview:map];
map.settings.myLocationButton = YES;
UIButton *button = [UIButton buttonWithType:UIButtonTypeRoundedRect];
button.frame = CGRectMake(200, 65, 100, 40);
[button setTitle:#"SEARCH" forState:UIControlStateNormal];
[button addTarget:self action:#selector(search:) forControlEvents:UIControlEventTouchUpInside];
[self.view addSubview:button];
addressfeild = [[UITextField alloc] initWithFrame:CGRectMake(10, 68, 200, 30)];
addressfeild.placeholder = #"SEARCH";
[addressfeild setBorderStyle:UITextBorderStyleRoundedRect];
[self.view addSubview:addressfeild];
}
-(IBAction)search:(id)sender
{
[self location:str1];
}
-(void)location:(NSString *)address
{
NSString *baseUrl =#"https://maps.googleapis.com/maps/api/place/nearbysearch/json?";
NSString *url = [NSString stringWithFormat:#"%#location=%#&radius=10000&name=dominos&sensor=false&key=AIzaSyCczXEpxw19qAXQMEUUA98OsMaOESNSOjM",baseUrl,address];
url = [url stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding];
NSURL *queryUrl = [NSURL URLWithString:url];
NSLog(#"query url%#",queryUrl);
dispatch_async(dispatch_get_main_queue(), ^{
NSData *data = [NSData dataWithContentsOfURL:queryUrl];
[self fetchData:data];
});
}
-(void)fetchData:(NSData *)data
{
NSString *data1 = [NSString stringWithUTF8String:[data bytes]];
// NSLog(#"Response data: %#", data1);
NSError *error;
NSDictionary *json = [NSJSONSerialization JSONObjectWithData:data options:kNilOptions error:&error];
NSArray* results =[json objectForKey:#"results"];
//NSLog(#"Data is:%#" ,results);
for (int i = 0;i <[results count]; i++) {
NSDictionary *result = [results objectAtIndex:i];
// NSLog(#"Data is %#", result);
NSString *address = [result objectForKey:#"vicinity"];
// NSLog(#"Address is %#", address);
NSString *name = [result objectForKey:#"name"];
//NSLog(#"name is %#", name);
NSDictionary *geometry = [result objectForKey: #"geometry"];
NSDictionary *locations = [geometry objectForKey:#"location"];
NSString *lat =[locations objectForKey:#"lat"];
NSString *lng =[locations objectForKey:#"lng"];
//NSLog(#"longitude is %#", lng);
NSDictionary *gc = [[NSDictionary alloc]initWithObjectsAndKeys:lat,#"lat",lng,#"lng",address,#"address",name,#"name", nil];
location = gc;
double lat1 = [[location objectForKey:#"lat"] doubleValue];
NSLog(#"Marker position%f",lat1);
double lng1 = [[location objectForKey:#"lng"] doubleValue];
NSLog(#"Marker position%f",lng1);
GMSMarker *marker = [[GMSMarker alloc]init];
CLLocationCoordinate2D local = CLLocationCoordinate2DMake(lat1, lng1);
marker.position = local;
marker.title = [ location objectForKey:#"name"];
NSLog(#"Address is %#",marker.title);
marker.snippet = [location objectForKey:#"address"];
marker.map = map;
GMSCameraUpdate *cams = [GMSCameraUpdate setTarget:local zoom:12];
[map animateWithCameraUpdate:cams];
}
}
- (void)didReceiveMemoryWarning
{
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
#end
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I am facing trouble with the functions which i bolded up. Actually i want to pass the co-ordinates of my current location from placevcViewController.m to fetchurl.m through a function -(void)location:(CLLocationManager *)address withCallback:(SEL)sel withDelegate: (id)delegate; , but somehow it is not working. Either the function is incorrect or i am not using the correct data type for fetching the co-ordinates.
Updates :
I have update the above code in fetchurl.m file(you can c ** there the code within the stars is upadted ) , and the updation is helping me to get the array of multiple locations. But now i am not getting how to add the marker on each location.

Answer 1

To use the delegate-protocol pattern successfully, you need some additional setup:
PlacevcViewController.h needs to define both a delegate property, and define the protocol:
#property (nonatomic, assign) id delegate;
//at the bottom of your file, below the #interface ... #end
#protocol nameOfYourProtocol <NSObject>
-(void)methodForDoingSomething:(SomeClass*)argument;
#end
Then within PlacevcViewController.m you can call your delegate method like this:
[self.delegate methodForDoingSomething:anArgument];
Then you assign your delegate and implement the method in the target class (fetchUrl.h in your case)
//declare conformity to the protocol like this in the header file
#interface fetchurl : NSObject <nameOfYourProtocol>
and finally in the fetchUrl.m file:
//assign the delegate to self when creating an instance of fetchUrl
fu = [[fetchUrl alloc] init];
[fu setDelegate:self];
//implement the delegate method
- (void)methodForDoingSomething:(SomeClass*)argument {
//your code goes here
}
While there is nothing right or wrong about using the delegate-protocol pattern, from what I can tell of your example a simpler approach might be to just define a method within fetchUrl that returns the items you need and let the owner of that instance of fetchUrl handle it. ie:
- (NSDictionary*)fetchData:(NSData*)data {
//do the work and create a dictionary
//return theDictionary
}
and then just consume the result in your placevcViewController:
NSDictionary* results = [fu fetchData:someData];
//now work with the results