Depend is a simple dependency injection framework to do the simplest and minimally invasive property injection. It just works with Protocol bindings since it is the right thing to do! And it’s pretty simple:
You can install using CocoaPods:
pod ‘Depend'
Or, you can drop the files inside Pod/Classes into your project.
Just provide the DPRegistry the implementation for the protocol:
[[DPRegistry sharedRegistry] registerImplementation:[DPDatasource class] forProtocol:@protocol(DPDatasourceProtocol) context:nil];
The implementation works this way:
If you provide a class: The injection class will instantiate for you with the default constructor If you provide an instance: The instance will be injected!
On the app delegate, you need to call the DPInjector inject method:
-(BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
[DPInjector inject];
return YES;
}
To inject on a class you just need to write your property declaration with the 'injected' prefix to the setter and the readonly qualifier. It’s important to declare it on the private interface of your class.
@property (setter=injected1:) id<DPDatasourceProtocol> datasource;
@property (setter=injected2:) id<REDUser> user;
Done! When you access **self.datasource **, it is going to be already populated.
For you who wondered what is the context parameter on the DPRegistry registerImplementation:forProtocol:context: method. Defining a context on the injection and in the registration can be used to provide different implementations.
Just change the injection declaration to:
@property (setter=injected_post:) id<DPDatasourceProtocol> postDatasource; @property (setter=injected_stupid:) id<DPDatasourceProtocol> anotherStupidDatasource;
And the registration to:
[[DPRegistry sharedRegistry] registerImplementation:[DPPostDatasource class] forProtocol:@protocol(DPDatasourceProtocol) context:@“post”]; [[DPRegistry sharedRegistry] registerImplementation:[DPStupidDatasource class] forProtocol:@protocol(DPDatasourceProtocol) context:@“stupid”];
Any word that comes after the _ (underline) is the context name.
Check out this small project ! https://github.com/rafagonc/Reading-List/
And the registrations! https://github.com/rafagonc/Reading-List/blob/master/ReadingList/REDDepedencyInjection.m
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Copyright (c) 2015 Rafael Gonçalves
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