[Interest] QIOSApplicationDelegate and Categories

Nuno Santos nunosantos at imaginando.pt
Wed May 10 12:20:33 CEST 2017


On my iOS apps I’m using categories to be to catch the didFinishLaunchingWithOptions method:

@interface QIOSApplicationDelegate
//! Add a category to QIOSApplicationDelegate
@interface QIOSApplicationDelegate (MyApplicationDelegate)

@implementation QIOSApplicationDelegate (MyApplicationDelegate)




I was also calling a method from C++ in order to initialise a second app delegate.

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
    static dispatch_once_t pred;
    static MyAppDelegate *shared = nil;
    dispatch_once(&pred, ^{
        shared = [[super alloc] init];

    return shared;

This was interfering with a lib I wanted to use, rendering it unusable. My option was to get ride of the secondary app delegate and use categories only.

The problem is that now, I don’t know how to call the AppDelegate from the C++ methods in the Cocoa side. I used to do something like this:

MyAppDelegate *app = [MyAppDelegate sharedMyAppDelegate];

Question: how can I refer from C++ on the Cocoa side to the AppDelegate associated with the category MyApplicationDelegate so that I can call myNewMethodDeclaredOnMyApplicationDelegate?



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