ranoble / objective-c-dependency-injection Goto Github PK

DepenencyContext is an attempt to bring lightweight simple Dependency Injection to Objective C.

It currently only needs a dependencies file (plist), and the library including the SynthesizeSingleton.h class.

The DependencyContext class is a singleton that keeps a list of used Services, but only loads the implementation at first request.

At present only one instance per service will be instantiated. 
Support for other situations could be added later if it proves to be 
a requirement.

Usage: 

Like standard DI you will need to define a protocol (interface for the java minded) and one or more implementations.

Next you will need to define a dependencies file named dependencies.plist in your resources use the key column for your Service and the value as a String the implementation you wish to inject.

Include DependencyContext.h in any files that you wish to use access the dependencies for.

From here on in you can access any service using the [[DependencyContext sharedInstance] getDependency: __SERVICESTRING__] call.

Autowiring - can be improved: 

Do as above; then create a property in the header file you plan to use. 
IE: id<Service> servicePropertyName; 
Next define the property further as @property(getter=[get[Service], readonly) id<Service> servicePropertyName;

lastly in your implementation call the macro AUTO_WIRE([Service], @"[Service]") where service is the name of the service.

now you can use the injected service as a standard (readonly) property