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# Contributing to the Mapbox iOS SDK
This document explains how to build the Mapbox iOS SDK from source. It is intended for advanced developers who wish to contribute to Mapbox GL and the Mapbox iOS SDK.
### Requirements
The Mapbox iOS SDK and iosapp demo application build against the iOS 7.0 SDK and require Xcode on a computer running OS X.
### Build
[Install core dependencies](../../INSTALL.md), then run
make iproj
Which will create and open an Xcode project that 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.
`ipackage` is only one of several available `make` build targets. Others include:
* `make ipackage` builds both dynamic and static frameworks in the Release configuration for devices and the iOS Simulator.
* `make ipackage-sim` builds a dynamic framework in the Debug configuration for the iOS simulator. This is the fastest target.
* `make ipackage-strip` builds both dynamic and static frameworks in the Release configuration, stripped of debug symbols, for devices and the iOS Simulator.
* `make iframework` builds a dynamic framework in the Release configuration for devices and the iOS Simulator. The CocoaPods pod downloads the output of this target.
You can customize the build output by passing the following arguments into the `make` invocation:
* `BITCODE=NO` builds without Bitcode support.
* `BUILD_DEVICE=false` builds only for the iOS Simulator.
* `FORMAT=dynamic` builds only a dynamic framework. `FORMAT=static` builds only a static framework, for compatibility with iOS 7.x.
* `SYMBOLS=NO` strips the build output of any debug symbols, yielding much smaller binaries.
### 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/studio/account/tokens/)._
Set up the access token by editing the scheme for the application target, then adding an environment variable with the name `MAPBOX_ACCESS_TOKEN`.
### 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 `platform/ios/test/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 cycle through the debug options.
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