CODEWITHSUNDEEP
xcodexcode5
Duck
Duck

Reputation: 36003

Xcode and the path nightmare

I have this project called engine.xcodeproj embedded inside another project myApp.

This engine has to get an value from MainViewController.h that is the header of a class of the application, outside the scope of the engine.xcodeproj.

How do I make all app main paths visible to embedded projects!

I am using Xcode 5 and compiling for iOS 6.

I have answered this before on SO, but the answers to those questions are not solving this case...

see picture:

enter image description here

thanks.

Upvotes: 0

Views: 90

Answers (1)

Léo Natan
Léo Natan

Reputation: 57060

Uhm, this is what is called spaghetti code.

It would be better to define a protocol in the Engine project, which your view controller can implement, and then pass an id<Protocol> to the engine. This creates an abstraction between the two projects while defining a strong language (API) between them. You mention you wish to use the Engine project in several apps - this is your best solution.

In Engine project:

@protocol MyAPIProtocol

@required

//Define here the actions you want to perform/get from the data source.
- (CGFloat)floatValue;
- (UITextView*)textView;
- (void)displayAlertWithMessage:(NSString*)message;

@end

Now, your Rocket class should have a property defined like so:

@property (nonatomic, weak) id<MyAPIProtocol> dataSource; //Whatever name you need, of course

Now in your apps that use this Engine project:

#import "MyAPIProtocol.h"

@interface MainViewController () <MyAPIProtocol>
@end

@implementation MainViewController

...

//Implement the protocol
- (CGFloat)floatValue
{
    return 123.0f;
}

- (UITextView*)textView
{
    return self.textView;
}

- (void)displayAlertWithMessage:(NSString*)message
{
    //...
}

@end

The result is that the Engine project is self-contained, and does not need to know the implementation of MainViewController. It just knows that it has a dataSource property which can satisfy all its needs.

Now, when you have your Engine object ready in your MainViewController, you should set its data source by:

self.engine.dataSource = self;

Upvotes: 4

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