Geocoding find coordinate from address

Method one instance method

- (void)geocodeFromAddress:(NSString *)address {
    //6
    CLGeocoder *geocoder = [[CLGeocoder alloc] init];
    [geocoder geocodeAddressString:address completionHandler:^(NSArray *placemarks, NSError *error) {
        if([placemarks count]) {
            CLPlacemark *placemark = [placemarks objectAtIndex:0];
            CLLocation *location = placemark.location;
            CLLocationCoordinate2D coordinate = location.coordinate;
            NSLog(@"coordinate = (%f, %f)", coordinate.latitude, coordinate.longitude);
        } else {
            NSLog(@"error");
        }
    }];
}

 Method  two class method this is google api

+(CLLocationCoordinate2D) getLocationFromAddressString:(NSString*) addressStr {

    double latitude = 0, longitude = 0;
    NSString *esc_addr =  [addressStr stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding];
    NSString *req = [NSString stringWithFormat:@"http://maps.google.com/maps/api/geocode/json?sensor=false&address=%@", esc_addr];
    NSString *result = [NSString stringWithContentsOfURL:[NSURL URLWithString:req] encoding:NSUTF8StringEncoding error:NULL];
    if (result) {
        NSScanner *scanner = [NSScanner scannerWithString:result];
        if ([scanner scanUpToString:@"\"lat\" :" intoString:nil] && [scanner scanString:@"\"lat\" :" intoString:nil]) {
            [scanner scanDouble:&latitude];
            if ([scanner scanUpToString:@"\"lng\" :" intoString:nil] && [scanner scanString:@"\"lng\" :" intoString:nil]) {
                [scanner scanDouble:&longitude];
            }
        }
    }
    CLLocationCoordinate2D center;
    center.latitude = latitude;
    center.longitude = longitude;
    return center;

}

Swipe to pop view controller for both IOS 6 and IOS 7

//

//
//
//  Created by Arun Thiru on 25/02/14.
//

#import <UIKit/UIKit.h>

@interface NewNavigationController : UINavigationController

@end

@interface BEWLoginNavigationController ()<UIGestureRecognizerDelegate, UINavigationControllerDelegate>

@property (nonatomic, retain) UISwipeGestureRecognizer *swipeGesture;

@end

@implementation NewNavigationController

#pragma mark - View cycles

- (void)viewDidLoad
{
    [super viewDidLoad];
   
    __weak NewNavigationController *weakSelf = self;
    self.delegate = weakSelf;
   
    self.swipeGesture = [[UISwipeGestureRecognizer alloc]initWithTarget:self action:@selector(gestureFired:)];
    [self.view addGestureRecognizer:self.swipeGesture];
}

#pragma mark - gesture method

-(void)gestureFired:(UISwipeGestureRecognizer *)gesture
{
    if (gesture.direction == UISwipeGestureRecognizerDirectionRight)
    {
        [self popViewControllerAnimated:YES];
    }
}

#pragma mark - UINavigation Controller delegate

- (void)pushViewController:(UIViewController *)viewController animated:(BOOL)animated
{
    self.swipeGesture.enabled = NO;
    [super pushViewController:viewController animated:animated];
}

#pragma mark UINavigationControllerDelegate

- (void)navigationController:(UINavigationController *)navigationController
       didShowViewController:(UIViewController *)viewController
                    animated:(BOOL)animate
{
    if(![viewController isKindOfClass:[YourViewController class]])
    {
        self.swipeGesture.enabled = YES;
    }
}

@end

Find the distance between two geograhical locaions

We need to pass to coordinate to the input to the system and the distance calculated and produced as as output NSNumber

- (NSNumber*)calculateDistanceInMetersBetweenCoord:(CLLocationCoordinate2D)coord1 coord:(CLLocationCoordinate2D)coord2 {

    NSInteger nRadius = 6371; // Earth's radius in Kilometers

    double latDiff = (coord2.latitude - coord1.latitude) * (M_PI/180);

    double lonDiff = (coord2.longitude - coord1.longitude) * (M_PI/180);

    double lat1InRadians = coord1.latitude * (M_PI/180);

    double lat2InRadians = coord2.latitude * (M_PI/180);

    double nA = pow ( sin(latDiff/2), 2 ) + cos(lat1InRadians) * cos(lat2InRadians) * pow ( sin(lonDiff/2), 2 );

    double nC = 2 * atan2( sqrt(nA), sqrt( 1 - nA ));

    double nD = nRadius * nC;

    // convert to meters

    return @(nD*1000);

}


for further reference refer apple guide and here

POST request json

Try the below code

    +(NSData *)postDataToUrl:(NSString*)urlString:(NSString*)jsonString
    {
        NSData* responseData = nil;
        NSURL *url=[NSURL URLWithString:[urlString stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding]];
        responseData = [NSMutableData data] ;
        NSMutableURLRequest *request=[NSMutableURLRequest requestWithURL:url];
        NSString *bodydata=[NSString stringWithFormat:@"data=%@",jsonString];

        [request setHTTPMethod:@"POST"];
        NSData *req=[NSData dataWithBytes:[bodydata UTF8String] length:[bodydata length]];
        [request setHTTPBody:req];
        NSURLResponse* response;
        NSError* error = nil;
        responseData = [NSURLConnection sendSynchronousRequest:request     returningResponse:&response error:&error];
        NSString *responseString = [[NSString alloc] initWithData:responseData encoding:NSUTF8StringEncoding];

        NSLog(@"the final output is:%@",responseString);

        return responseData;
    }

Ref: http://stackoverflow.com/questions/5537297/ios-how-to-perform-an-http-post-request

Fetch record

NSFetchRequest *fetchRequest = [[NSFetchRequest alloc] init];
NSEntityDescription *entity = [NSEntityDescription entityForName:@"EntityName"
      inManagedObjectContext:self.managedObjectContext];
[fetchRequest setEntity:entity];
NSError *error = nil;
NSArray *fetchedObjects = [self.managedObjectContext
      executeFetchRequest:fetchRequest error:&error];
[fetchRequest release];

Task Manager

//Header File typedef void (^TaskBlock)(void); typedef void (^TaskCompletedBlock)(void); @interface FCTaskManager : NSObject -(void)performUITask:(TaskBlock)taskBlock completionBlock:(TaskCompletedBlock)taskCompletedBlock; -(void)performBackgroundTask:(TaskBlock)taskBlock completionBlock:(TaskCompletedBlock)taskCompletedBlock; @end //Implementation #import "FCTaskManager.h" @implementation FCTaskManager -(void)performUITask:(TaskBlock)taskBlock completionBlock:(TaskCompletedBlock)taskCompletedBlock { dispatch_async( dispatch_get_main_queue(), ^{ @autoreleasepool { taskBlock(); dispatch_async( dispatch_get_main_queue(), ^{ taskCompletedBlock(); }); } }); } -(void)performBackgroundTask:(TaskBlock)taskBlock completionBlock:(TaskCompletedBlock)taskCompletedBlock { dispatch_async( dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{ @autoreleasepool { taskBlock(); dispatch_async( dispatch_get_main_queue(), ^{ taskCompletedBlock(); }); } }); } @end Then I can use the task manager like so: -(void)viewDidLoad { [super viewDidLoad]; //Create taskManager taskManager = [[FCTaskManager alloc] init]; //Create UIViews, etc WITHOUT blocking main queue [taskManager performUITask:^{ button = [[UIButton alloc] initWithFrame:CGRectMake(30, 30, 300, 300)]; [button setBackgroundColor:[UIColor redColor]]; [button setTitle:@"Working" forState:UIControlStateNormal]; [button addTarget:self action:@selector(buttonAction) forControlEvents:UIControlEventTouchUpInside]; } completionBlock:^{ NSLog(@"CREATED BUTTON"); [self.view addSubview:button]; }]; }

Dispatch Queue

dispatch_queue_t jsonParsingQueue = dispatch_queue_create("jsonParsingQueue", NULL);
//the name can be anything background 

// execute a task on that queue asynchronously on background 
dispatch_async(jsonParsingQueue, ^{

      [self citySearchArrayMethod]; // populates the city table with city list

    // some code on a main thread (delegates, notifications, UI updates...) 

    dispatch_async(dispatch_get_main_queue(), ^{

      [self.tableView reloadData]; // load the table with data

    });
});