Question

我愿放弃我项目中的第十一B(Nib)档案,因为这只是我是如何滚动的。然而,我发现,我的应用方法的确是FinishLaunching WithOptions,但从未被叫作过。

I tried setting the principal class in my app s main plist like so:

<key>NSPrincipalClass</key>
<string>AppDelegate</string>

这只会导致错误:

    +[AppDelegate registerForSystemEvents]: unrecognized selector sent to class

因此,我怎么能没有主要班子,我才有我的任命班子。

感谢。

Answer 1

The easiest thing to do is just start with an appropriate project template... choosing "Empty Application" does not create a nib, but does properly setup you main.m with the following crucial line:

return UIApplicationMain(argc, argv, nil, NSStringFromClass([AppDelegate class]));

我想登记 ForSystemEvents is a private means on UIApplication, which is used, since the main category should be UIApplication or subclass it, not a responseer conform to UIApplicationDelegate.

The UIApplicationMain() call above will set your principal class to UIApplication and the delegate to your custom AppDelegate class.

但正如我所说的那样,仅仅通过使用适当的项目模板使生活变得简单。

Answer 2

All C based programs need main.m, which is the starting point for all programs. You can choose a blank template, or you can just create your own. Though if you create your own you do need to make sure you ve got an autorelease pool. You need to import your app delegate into main.m and I m pretty sure you need UIKit as well. Then add the following code (replacing your app delegate class as needed:

int main(int argc, char *argv[])
    {
        int retVal = 0;
        @autoreleasepool {
            retVal = UIApplicationMain(argc, argv, nil, NSStringFromClass([AppDelegate class]));
        }
        return retVal;
    }

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