objective C 过期后杀掉应用程序

// Based on original code by Daniel Jakult, based on an idea from Brian Cooke.
#ifdef BETA  // 4 week expiration
#define EXPIREAFTERDAYS 28
#endif
 
#if EXPIREAFTERDAYS
NSString* compileDateString = [NSString stringWithUTF8String:__DATE__];
NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
[dateFormatter setFormatterBehavior:NSDateFormatterBehavior10_4];
[dateFormatter setLocale:[[[NSLocale alloc] initWithLocaleIdentifier:@”en_US”]
	autorelease]];
[dateFormatter setDateFormat:@"MMM dd yyyy"];
NSDate *compileDate = [dateFormatter dateFromString:compileDateString];
[dateFormatter release];
NSDate *expireDate = [compileDate addTimeInterval:(60*60*24* EXPIREAFTERDAYS)];
 
if ([expireDate earlierDate:[NSDate date]] == expireDate)
{
	// Run an alert or whatever
 
	// Quit!
	[NSApp terminate:self];
}
#endif