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// this code will cause a UIView to shake--good for "login error"

CAKeyframeAnimation * anim = [ CAKeyframeAnimation animationWithKeyPath:@"transform" ] ;
anim.values = [ NSArray arrayWithObjects:
                   [ NSValue valueWithCATransform3D:CATransform3DMakeTranslation(-5.0f, 0.0f, 0.0f) ],
                   [ NSValue valueWithCATransform3D:CATransform3DMakeTranslation(5.0f, 0.0f, 0.0f) ], 
                   nil ] ;
anim.autoreverses = YES ;
anim.repeatCount = 2.0f ;
anim.duration = 0.07f ;

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// 01. init method forbidden
- (id)init {
    @throw [NSException exceptionWithName:NSInternalInconsistencyException
                                   reason:@"-init is not a valid initializer for the class Foo"
                                 userInfo:nil];
    return nil;
}

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- (NSArray *)matchUrlInString:(NSString *)string
{
    NSError *error = NULL;
    NSDataDetector *detectorLink = [NSDataDetector dataDetectorWithTypes:NSTextCheckingTypeLink error:&error];
    NSArray *urlMatchArr = [detectorLink matchesInString:string options:NSMatchingReportCompletion range:NSMakeRange(0, string.length)];
    
    return urlMatchArr;
}

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#########################
# .gitignore file for Xcode4 and Xcode5 Source projects
#
# Apple bugs, waiting for Apple to fix/respond:
#
#    15564624 - what does the xccheckout file in Xcode5 do? Where's the documentation?
#
# Version 2.3
# For latest version, see: http://stackoverflow.com/questions/49478/git-ignore-file-for-xcode-projects
#

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- (void)logClassMethods:(Class)class
{
    NSString* className = NSStringFromClass(class);
    const char* cClassName = [className UTF8String];
    id theClass = objc_getClass(cClassName);
    unsigned int outCount;
    
    Method* m = class_copyMethodList(theClass, &outCount);
    NSLog(@"Class: %@, has methods: %d", className, outCount);
    

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// Call this method somewhere in your view controller setup code.
- (void)registerForKeyboardNotifications
{
    [[NSNotificationCenter defaultCenter] addObserver:self
            selector:@selector(keyboardWasShown:)
            name:UIKeyboardDidShowNotification object:nil];
 
   [[NSNotificationCenter defaultCenter] addObserver:self
             selector:@selector(keyboardWillBeHidden:)
             name:UIKeyboardWillHideNotification object:nil];

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NSString *str = @"中国";
CFStringRef aCFString = (__bridge CFStringRef)str;
CFMutableStringRef string = CFStringCreateMutableCopy(NULL, 0, aCFString);
CFStringTransform(string, NULL, kCFStringTransformMandarinLatin, NO);
CFStringTransform(string, NULL, kCFStringTransformStripDiacritics, NO);
NSLog(@"中国 = %@", string);

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#pragma mark - CoreDataAbout

- (void)saveContext
{
    NSError* error = nil;
    NSManagedObjectContext *managedObjectContext = self.managedObjectContext;
    if (managedObjectContext != nil) {
        if ([managedObjectContext hasChanges] && ![managedObjectContext save:&error]) {
            NSLog(@"Unresolved error :%@, %@", error, [error userInfo]);
            abort();

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    NSLog(@"HostName: %@", [[NSProcessInfo processInfo] hostName]);
    //globallyUniqueString 唯一的标示符，每次调用都会不一样，可以用作一些临时缓存文件的名字
    NSLog(@"GlobalUniqueString: %@", [[NSProcessInfo processInfo] globallyUniqueString]);
    //操作系统名称
    NSLog(@"OperatingSystemName: %@", [[NSProcessInfo processInfo] operatingSystemName]);
    //操作系统版本
    NSLog(@"OperatingSystemVersion: %@", [[NSProcessInfo processInfo] operatingSystemVersionString]);
    //物理内存
    NSLog(@"PhysicalMem: %llu", [[NSProcessInfo processInfo] physicalMemory]);
    //进程名称

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// Use Gists to store code you would like to remember later on
console.log(window); // log the "window" object to the console