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CLLocationManager-blocks

A category on CLLocationManager adding blocks. Also some new features.

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CLLocationManager-blocks

A category on CLLocationManager adding blocks plus some new functionality.

NOTE: Supporting iOS 8 from version 1.3.0.

Installation

CLLocationManager-block is available through CocoaPods, to install it simply add the following line to your Podfile:

pod 'CLLocationManager-blocks'

Usage

This category provides location updates in two ways.

  • Custom update blocks for location and heading
  • Block implementation of the CLLocationManagerDelegate methods

Block for recieving updates

Recieving location updates in a block.

self.manager = [CLLocationManager updateManagerWithAccuracy:50.0 locationAge:15.0 authorizationDesciption:CLLocationUpdateAuthorizationDescriptionAlways];
[self.manager startUpdatingLocationWithUpdateBlock:^(CLLocationManager *manager, CLLocation *location, NSError *error, BOOL *stopUpdating) {
    NSLog(@"Our new location: %@", location);
}]; 

NOTE: Location updates will start automatically by calling this method. No need to call startUpdatingLocation.

By using this block you will get the location updates without using the delegate methods. The underlying method locationManager:didUpdateLocations:does provide updates in an array, but we spilt them up into single updates in the block.

If the update is unsuccessful an error will be provided and location will be nil. If success the error will be nil and location will be an CLLocation object.

You can set the stopUpdating boolean to YES stop location updates at any successful or unsuccessful update.

*stopUpdating = YES; 

A similar method exist for recieving heading updates:

[self.manager startUpdatingHeadingWithUpdateBlock:^(CLLocationManager *manager, CLHeading *heading, NSError *error, BOOL *stopUpdating) {
    NSLog(@"Our new heading: %@", heading);
    *stopUpdating = YES;
}];

Authorization Description

New to iOS 8 is the need for the key NSLocationAlwaysUsageDescription to be set in the info.plist. Make sure you add this.

Filters

In addition to the blocks two new filters is included. Normally when you are listening for location updates you will recieve location updates with undesired age og accuracy. One would then have to write code to avoid the usage of these updates. Thanks to the new filters we just have to specify the an age and/or accuracy to get a location update we can work with.

updateAccuracyFilter

The standard [CLLocationManager desiredAccuracy] provided in Core Location cannot garantie that specific accuracy requrements are meet. By setting this parameter all updates with a higher inaccuracy than specified are excluded.

  • Unless you are running updates for a long period, set the [CLLocationManager desiredAccuracy] to kCLLocationAccuracyBest and your desired updateAccuracyFilter specified in meters.
  • updateAccuracyFilter is used for all blocks.
  • Default is set to kCLUpdateAccuracyFilterNone.

updateLocationAgeFilter

This parameter is set to filter out location updates older than the specified value in seconds. CLLocationManager location updates may provide old updates for different reasons and this is a good way to get a fresh update.

  • Default is set to kCLLocationAgeFilterNone

Example

self.manager.updateAccuracyFilter = 50.0;
self.manager.updateLocationAgeFilter = 15.0;
//or
self.manager.updateAccuracyFilter = kCLUpdateAccuracyFilterNone;
self.manager.updateLocationAgeFilter = kCLLocationAgeFilterNone;

Blocks

The category contains block implementations of all CLLocationManagerDelegate methods. These blocks can be used together with CLLocationManager just as you normally would have used the delegate.

NOTE: Unlike the startUpdatingLocationWithUpdateBlock: you will have to call startUpdatingLocation to recieve updates.

Example

locationManager:didUpdateLocations:

self.manager = [CLLocationManager updateManager];
[self.manager didUpdateLocationsWithBlock:^(CLLocationManager *manager, NSArray *locations) {
    // Did update locations
}];
[self.manager startUpdatingLocation];

Convenience methods

Method to ease the steps to state if location updates is authorized by the user.

isLocationUpdatesAvailable

if ([CLLocationManager isLocationUpdatesAvailable]) {
    // Location updates authorized
}

License

See the LICENSE file

© 2013 Aksel Dybdal

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