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February 2, 2018 10:29
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universal main.m for iOS and OSX with or without ARC. It checks the info.plist and invokes apple's native `UIApplicationMain` or `NSApplicationMain` with the right parameters in any case. (See Comment for more info)
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// | |
// main.m | |
// | |
// Created by Dominik Pich on 10.02.13. | |
// Everybody is free to use this however they want! | |
// | |
#if TARGET_OS_IPHONE | |
#import <UIKit/UIKit.h> | |
#else | |
#import <Cocoa/Cocoa.h> | |
#endif | |
#define kDDAppDelegateClassKey @"DDAppDelegateClass" | |
#define kNSMainNibFileKey @"NSMainNibFile" | |
#define kNSPrincipalClassKey @"NSPrincipalClass" | |
#if TARGET_OS_IPHONE | |
#define kNSPrincipalClassDefault @"UIApplication" | |
#else | |
#define kNSPrincipalClassDefault @"NSApplication" | |
#endif | |
id DDAppDelegate = nil;//arc releases this too early if we make it a stack var | |
int main(int argc, char *argv[]) | |
{ | |
int status = -1; | |
#if !__has_feature(objc_arc) | |
NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init]; | |
#else | |
@autoreleasepool | |
#endif | |
{ | |
NSDictionary *infoDict = [[NSBundle mainBundle] infoDictionary]; | |
NSString *appDelegateClassName = [infoDict objectForKey:kDDAppDelegateClassKey]; | |
NSString *nibName = [infoDict objectForKey:kNSMainNibFileKey]; | |
NSString *principalClassName = [infoDict objectForKey:kNSPrincipalClassKey]; | |
BOOL hasAppDelegateClassName = appDelegateClassName.length; | |
BOOL hasNibName = nibName.length; | |
BOOL hasCustomPrincipalClassName = (principalClassName.length && ![principalClassName isEqualToString:kNSPrincipalClassDefault]); | |
assert((hasAppDelegateClassName || hasNibName || hasCustomPrincipalClassName) && "need to specify EITHER a xib file (via NSMainNibFile key) OR a class name to use as delegate for the application (via DDAppDelegateClass key) OR the name of the custom principal class (via NSPrincipalClass key)"); | |
#if TARGET_OS_IPHONE | |
status = UIApplicationMain(argc, argv, principalClassName, appDelegateClassName); | |
#else | |
id appDelegate = nil; | |
if(hasAppDelegateClassName) { | |
Class appDelegateClass = NSClassFromString(appDelegateClassName); | |
DDAppDelegate = [[appDelegateClass alloc] init]; | |
[[NSApplication sharedApplication] setDelegate:DDAppDelegate]; | |
} | |
status = NSApplicationMain(argc, (const char **)argv); | |
#if !__has_feature(objc_arc) | |
[appDelegate autorelease]; | |
#endif | |
appDelegate = nil; | |
#endif | |
} | |
#if !__has_feature(objc_arc) | |
[pool drain]; | |
#endif | |
return status; | |
} |
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Why you declare
id appDelegate = nil
? In which case it used?I think
DDAppDelegate
should be used insteadappDelegate
.