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+# Developing for iOS on OS X
+
+This process gives you a native iOS app for testing changes to mapbox-gl-native
+on a simulator or device. Normally production use of the library is via a
+precompiled binary linked into the app target: this process instead compiles
+Mapbox GL Native from source along with your application, so it can include
+latest development and your own modifications.
+
+Developing for iOS implies an OS X host system.
+
+### Build
+
+Run
+
+ make iproj
+
+Which which will create and open an Xcode project which can build the entire library from source, as well as an Objective-C test app.
+
+If you don't have an Apple Developer account, change the destination from "My Mac" to a simulator such as "iPhone 6" before you run and build the app.
+
+### Access Tokens
+
+_The demo applications use Mapbox vector tiles, which require a Mapbox account and API access token. Obtain an access token on the [Mapbox account page](https://www.mapbox.com/account/apps/)._
+
+Set up the access token by editing the scheme for the application target, then adding an environment variable with the name `MAPBOX_ACCESS_TOKEN`.
+
+![edit scheme](https://cloud.githubusercontent.com/assets/98601/5460702/c4610262-8519-11e4-873a-8597821da468.png)
+
+![setting access token in Xcode scheme](https://cloud.githubusercontent.com/assets/162976/5349358/0a086f00-7f8c-11e4-8433-bdbaccda2b58.png)
+
+### Test
+
+Run
+
+ make itest
+
+To run the included integration tests on the command line.
+
+If you want to run the tests in Xcode instead, first `make ipackage` to create a local static library version, then open `test/ios/ios-tests.xcodeproj`, and lastly `Command + U` on the `Mapbox GL Tests` application target.
+
+### Usage
+
+- Pan to move
+- Pinch to zoom
+- Use two fingers to rotate
+- Double-tap to zoom in one level
+- Two-finger single-tap to zoom out one level
+- Double-tap, long-pressing the second, then pan up and down to "quick zoom" (iPhone only, meant for one-handed use)
+- Use the debug menu to add test annotations, reset position, and toggle debug info.