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NSRunAlertPanel(@"Tracker already running", @"The Tracker is already running.", @"OK", nil, nil);

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@throw [NSException exceptionWithName:@"GAJSException"
                               reason:@"Failed to load JavaScriptEngine"
                             userInfo:nil];

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static NSString* GAEscapeNSString(NSString* value) {
    if (!value) return nil;
    const char *chars = [value UTF8String];
    NSMutableString *escapedString = [NSMutableString string];
    while (*chars) {
        if (*chars == '\\') {
            [escapedString appendString:@"\\\\"];
        } else if (*chars == '\'') {
            [escapedString appendString:@"\\'"];
        } else {

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[NSKeyedArchiver archiveRootObject:Object toFile:filePath]

[NSKeyedUnarchiver unarchiveObjectWithFile:filePath]

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@synchronized(self) {
  // Code here will be execute by only one thread.
}

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NSDate* now = [NSDate date];
NSDateComponents* ageComponents = [[NSCalendar currentCalendar]
                                   components:NSYearCalendarUnit
                                   fromDate:self.birthday
                                   toDate:now
                                   options:0];
NSInteger age = [ageComponents year];

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git rm --cached ProjectFolder.xcodeproj/project.xcworkspace/xcuserdata/myUserName.xcuserdatad/UserInterfaceState.xcuserstate
git commit -m "Removed file that shouldn't be tracked"

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*.app
build/
.DS_Store
*~
.LSOverride
*.xcuserdatad
*.xcworkspace

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NSObject
Sending Messages
– performSelector:withObject:afterDelay:
– performSelector:withObject:afterDelay:inModes:
– performSelectorOnMainThread:withObject:waitUntilDone:
– performSelectorOnMainThread:withObject:waitUntilDone:modes:
– performSelector:onThread:withObject:waitUntilDone:
– performSelector:onThread:withObject:waitUntilDone:modes:
– performSelectorInBackground:withObject:
+ cancelPreviousPerformRequestsWithTarget:

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- (void)applicationDidBecomeActive:(UIApplication *)application
{
    application.applicationIconBadgeNumber = 0;
}