ProMotion-map

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ProMotion-map provides a PM::MapScreen, extracted from the popular RubyMotion gem ProMotion.

Installation

gem 'ProMotion-map'

Usage

Easily create a map screen, complete with annotations.

Has all the methods of PM::Screen

class MyMapScreen < PM::MapScreen
  title "My Map"
  start_position latitude: 35.090648651123, longitude: -82.965972900391, radius: 4
  tap_to_add

  def annotation_data
    [{
      longitude: -82.965972900391,
      latitude: 35.090648651123,
      title: "Rainbow Falls",
      subtitle: "Nantahala National Forest",
      action: :show_forest
    },{
      longitude: -82.966093558105,
      latitude: 35.092520895652,
      title: "Turtleback Falls",
      subtitle: "Nantahala National Forest",
      action: :show_forest
    },{
      longitude: -82.95916,
      latitude: 35.07496,
      title: "Windy Falls",
      action: :show_forest
    },{
      longitude: -82.943031505056,
      latitude: 35.102516828489,
      title: "Upper Bearwallow Falls",
      subtitle: "Gorges State Park",
      action: :show_forest
    },{
      longitude: -82.956244328014,
      latitude: 35.085548421623,
      title: "Stairway Falls",
      subtitle: "Gorges State Park",
      your_param: "CustomWhatever",
      action: :show_forest
    }, {
      coordinate: CLLocationCoordinate2DMake(35.090648651123, -82.965972900391)
      title: "Rainbow Falls",
      subtitle: "Nantahala National Forest",
      image: UIImage.imageNamed("custom-pin"),
      action: :show_forest
    }]
  end

  def show_forest
    selected = selected_annotations.first
    # Do something with the selected annotation.
  end
end

Here's a neat way to zoom into a specific marker in an animated fashion and then select the marker:

def zoom_to_marker(marker)
  set_region region(coordinate: marker.coordinate, span: [0.05, 0.05])
  select_annotation marker
end

Methods

annotation_data

Method that is called to get the map's annotation data and build the map. If you do not want any annotations, simply return an empty array.

All possible properties:

{
    # REQUIRED -or- use :coordinate
    longitude: -82.956244328014,
    latitude: 35.085548421623,

    # REQUIRED -or- use :longitude & :latitude
    coordinate: CLLocationCoordinate2DMake(35.085548421623, -82.956244328014)

    title: "Stairway Falls", # REQUIRED
    subtitle: "Gorges State Park",
    image: "my_custom_image",
    left_accessory: my_button,
    right_accessory: my_other_button,
    action: :my_action, # Overrides :right_accessory
    action_button_type: UIButtonTypeContactAdd # Defaults to UIButtonTypeDetailDisclosure
}

You may pass whatever properties you want in the annotation hash, but (:longitude && :latitude || :coordinate), and :title are required.

Use :image to specify a custom image. Pass in a string to conserve memory and it will be converted using UIImage.imageNamed(your_string). If you pass in a UIImage, we'll use that, but keep in mind that there will be another unnecessary copy of the UIImage in memory.

Use :left_accessory and :right_accessory to specify a custom accessory, like a button.

You can access annotation data you've arbitrarily stored in the hash by calling annotation_instance.params[:your_param].

The :action parameter specifies a method that should be run when the detail button is tapped on the annotation. It automatically adds a UIButtonTypeDetailDisclosure button to the :left_accessory. In your method you can find out which annotation's accessory was tapped by calling selected_annotations.first.

update_annotation_data

Forces a reload of all the annotations

annotations

Returns an array of all the annotations.

center

Returns a CLLocation2D instance with the center coordinates of the map.

center=(Float, longitude: Float, animated: Boolean)

Sets the center of the map. animated property defaults to true.

show_user_location

Shows the user's location on the map. Must be called in the view initialization sequence on will_appear or after.

look_up_location(CLLocation) { |placemark, error| }

This method takes a CLLocation object and will return one to many CLPlacemark to represent nearby data.

iOS 8 Location Requirements

iOS 8 introduced stricter location services requirements. You are now required to add a few key/value pairs to the Info.plist. Add these two lines to your Rakefile (with your descriptions, obviously):

app.info_plist['NSLocationAlwaysUsageDescription'] = 'Description'
app.info_plist['NSLocationWhenInUseUsageDescription'] = 'Description'

Note: you need both keys to use get_once, so it's probably best to just include both no matter what. See Apple's documentation on iOS 8 location services requirements for more information.

hide_user_location

Hides the user's location on the map.

showing_user_location?

Returns a Boolean of whether or not the map view is currently showing the user's location.

user_location

Returns a CLLocation2D object of the user's location or nil if the user location is not being tracked

zoom_to_user(radius = 0.05, animated=true)

Zooms to the user's location. If the user's location is not currently being shown on the map, it will show it first. radius is a CLLocationDegrees of the latitude and longitude deltas. See Apple documentation for MKCoordinateSpan for more information.

select_annotation(annotation, animated=true)

Selects a single annotation.

select_annotation_at(annotation_index, animated=true)

Selects a single annotation using the annotation at the index of your annotation_data array.

selected_annotations

Returns an array of annotations that are selected. If no annotations are selected, returns nil.

deselect_annotations(animated=false)

Deselects all selected annotations.

add_annotation(annotation)

Adds a new annotation to the map. Refer to annotation_data (above) for hash properties.

add_annotations(annotations)

Adds more than one annotation at a time to the map.

clear_annotations

Removes all annotations from the MapScreen.

zoom_to_fit_annotations(include_user:false)

Changes the zoom and center point of the MapScreen to fit all the annotations. Passing include_user as true will cause the zoom to not only include the annotations from annotation_data but also the user pin in the zoom region calculation.

set_region(region, animated=true)

Sets the region of the MapScreen. region should be an instance of MKCoordinateRegion.

region(params)

Helper method to create an MKCoordinateRegion. Expects a hash in the form of:

my_region = region({
  coordinate:{
    latitude: 35.0906,
    longitude: -82.965
  },
  # span is the latitude and longitude delta
  span: [0.5, 0.5]
})

Class Methods

start_position(latitude: Float, longitude: Float, radius: Float)

Class method to set the initial starting position of the MapScreen.

class MyMapScreen < PM::MapScreen
  start_position latitude: 36.10, longitude: -80.26, radius: 4
end

radius is the zoom level of the map in miles (default: 10).

tap_to_add(length: Float, target: Object, action: Selector, annotation: Hash)

Lets a user long press the map to drop an annotation where they pressed.

Default values:

You can override any of these values. The annotation parameter can take any options specified in the annotation documentation above except :latitude, :longitude, and :coordinate.

length: 2.0,
target: self,
action: "gesture_drop_pin:",
annotation: {
  title: "Dropped Pin",
  animates_drop: true
}
Notifications

This feature posts two different NSNotificationCenter notifications:

ProMotionMapWillAddPin: Fired the moment the long press gesture is recognized, before the pin is added.

ProMotionMapAddedPin: Fired after the pin has been added to the map.

Example:
# Simple Example
class MyMapScreen < PM::MapScreen
  title "My Map Screen"
  tap_to_add length: 1.5
  def annotations
    []
  end
end

# A More Complex Example
class MyMapScreen < PM::MapScreen
  title "My Map Screen"
  tap_to_add length: 1.5, annotation: {animates_drop: true, title: "A Cool New Pin"}
  def annotations
    []
  end

  def will_appear
    NSNotificationCenter.defaultCenter.addObserver(self, selector:"pin_adding:") , name:"ProMotionMapWillAddPin", object:nil)
    NSNotificationCenter.defaultCenter.addObserver(self, selector:"pin_added:") , name:"ProMotionMapAddedPin", object:nil)
  end

  def will_disappear
    NSNotificationCenter.defaultCenter.removeObserver(self)
  end

  def pin_adding(notification)
    # We only want one pin on the map at a time
    clear_annotations
  end

  def pin_added(notification)
    # Once the pin is dropped we want to select it
    select_annotation_at(0)
  end
end

CocoaTouch Property Convenience Methods

MKMapView contains multiple property setters and getters that can be accessed in a more ruby-like syntax:

type # Returns a MKMapType
type = (MKMapType)new_type

zoom_enabled?
zoom_enabled = (bool)enabled

scroll_enabled?
scroll_enabled = (bool)enabled

pitch_enabled?
pitch_enabled = (bool)enabled

rotate_enabled?
rotate_enabled = (bool)enabled

Accessors

map or mapview

Reference to the created UIMapView.

Contributing

  1. Fork it
  2. Create your feature branch (git checkout -b my-new-feature)
  3. Commit your changes (git commit -am 'Add some feature')
  4. Make some specs pass
  5. Push to the branch (git push origin my-new-feature)
  6. Create new Pull Request