ISHPermissionKit

This framework provides a unified way of asking for user permissions on iOS. It also provides UI to explain the permission requirements before presenting the user with the system permission dialogue. This allows the developer to postpone the system dialogue. The framework provides no actual chrome, leaving the developer and designer in charge of creating the views.

While you can use this framework to ask for a user's permission to multiple things at the same time and out of context, you should continue to ask for permission only when the app needs it. However there might be occassions, where multiple permissions are required at the same time: e.g. when starting to record location and motion data.

This framework also provides explicit ways to ask for the user's permission where the systems APIs only provide implicit methods of doing so.

Supported permission categories:

AdressBook
Calendar: Events and Reminders
CoreLocation: Always and WhenInUse
CoreMotion: Activity data (step counting, etc.)
Health-App
Microphone
Notifications: Local
Photos: Camera Roll and Camera
Social-Services: Facebook, Twitter, SinaWeibo, TencentWeibo

The static library and sample app compile and run under iOS8 and iOS7. If compiled against iOS8 both make use of the latest available APIs (e.g. microphone, location and local notification permissions) and fall back gracefully when running under iOS7.

In contrast to other libraries (such as JLPermissions and ClusterPrePermissions) it allows you to present custom view controllers, ask for several permissions in a sequence and provides a unified API through subclasses.

Recommended reading: The Right Way To Ask Users For iOS Permissions

Roadmap

Missing features:

Resetting state correctly when device is reset
Permission Monitoring and NSNotification upon changes

Missing support for permissions to:

Remote notifications
Please file an issue for missing permissions

How to use

Installation

Static Library

Add this Xcode project as a sub project of your app. Then link your app target against the static library (ISHPermissionKitLib.a). You will also need to add the static library as a target dependency. Both settings can be found in your app target's Build Phases.

Add $(BUILT_PRODUCTS_DIR)/include/ (recursive) to your app target's Framework Search Paths.

Use #import <ISHPermissionKit/ISHPermissionKit.h> to import all public headers.

Dynamically-Linked Framework

Add this Xcode project as a sub project of your app. Then add the framework (ISHPermissionKit.framework) to the app's embedded binaries (On the General tab of your app target's settings). On the Build Phases tab, verify that the framework has also been added to the Target Dependencies and Link Binary with Libraries phases, and that a new Embed Frameworks phase has been created.

The framework can be used as a module, so you can use @import ISHPermissionKit; to import all public headers. Further reading on Modules: Clang Documentation

Note: To link against dynamic frameworks on iOS, a deployment target of at least iOS 8 is required.

CocoaPods

You can use CocoaPods to install ISHPermissionKit as a static library. This is all you have to put in your Podfile:

pod 'ISHPermissionKit'

See the official guides to get started with CocoaPods.

ISHPermissionsViewController

You can request permission for a single category or a sequence of categories. The following example presents a ISHPermissionsViewController for Activity and LocationWhenInUse permissions if needed.

NSArray *permissions = @[ 
    @(ISHPermissionCategoryLocationWhenInUse), 
    @(ISHPermissionCategoryActivity) 
    ];
ISHPermissionsViewController *vc = [ISHPermissionsViewController permissionsViewControllerWithCategories:permissions dataSource:self];

if (vc) {
    UIViewController *presentingVC = [self.window rootViewController];
    [presentingVC presentViewController:vc
                               animated:YES
                             completion:nil];
}

The designated constructor returns nil if non of the categories allow a user prompt (either because the user already granted or denied the permission, does not want to be asked again, or the feature is simply not supported on the device).

You can set a completionBlock or delegate (both optional) that will be notified once the ISHPermissionsViewController has iterated through all categories. If you do not set a delegate the view controller will simply be dismissed once finished and if set the completion block will be called. If you do set a delegate, the delegate is responsible for dismissing the view controller.

The dataSource is required and must provide one instance of a ISHPermissionRequestViewController for each requested ISHPermissionCategory.

The ISHPermissionRequestViewController provides IBAction to prompt for the user's permission, ask later, and don't ask. It does not however provide any buttons or UI. Your subclass can create a view with text, images and buttons etc. explaining in greater detail why your app needs a certain permission. The subclass should contain buttons that trigger at least one of the actions above mentioned above (see the header for their signatures). A cancel button should call changePermissionStateToAskAgainFromSender. If you subclass these three actions you must call super.

ISHPermissionRequest

The ISHPermissionRequest can be used to determine the current state of a permission category. It can also be used to trigger the user prompt asking for permission outside of the ISHPermissionsViewController.

You must use the addition (+all) method +requestForCategory: to create the appropriate request for the given permission category.

Here is how you check for user permissions to the microphone:

ISHPermissionRequest *r = [ISHPermissionRequest requestForCategory:ISHPermissionCategoryMicrophone];
BOOL granted = ([r permissionState] == ISHPermissionStateAuthorized);

The same example for local notifications (granted will always be true on iOS7):

ISHPermissionRequest *r = [ISHPermissionRequest requestForCategory:ISHPermissionCategoryNotificationLocal];
BOOL granted = ([r permissionState] == ISHPermissionStateAuthorized);

How to contribute

Contributions are welcome. Check out the roadmap and open issues. Adding support for more permission types is probably the most "rewarding", you can find a few hints below on how to get started.

Adding support for new permissions

You will need to create a new subclass of ISHPermissionRequest and add a ISHPermissionCategory (make sure to use explicit values as these may be persisted). Don't change existing values. Finally wire it up in ISHPermissionRequest+All by returning your new subclass in +requestForCategory:.

Subclasses must implement at least two methods:

- (ISHPermissionState)permissionState
- (void)requestUserPermissionWithCompletionBlock:(ISHPermissionRequestCompletionBlock)completion

What these methods will do, depends on the mechanisms that the system APIs provide. Ideally permissionState should check the system authorization state first and should return appropriate internal enum values from ISHPermissionState. If the system state is unavailable or is similar to kCLAuthorizationStatusNotDetermined then this method should return internalPermissionState. You should try to map system provided states to ISHPermissionState without resorting to the internalPermissionState as much as possible.

When requesting the permission state you should only store the result in internalPermissionState if the state cannot easily be retrieved from the the system (as is the case e.g. with M7-ActivityMonitoring).

App Icon designed by Jason Grube (CC BY 3.0) from the Noun Project

DDany/ISHPermissionKit