Check Email validation

- (BOOL)validateEmailWithString:(NSString*)email

{

    NSString *emailRegex = @"[A-Z0-9a-z._%+-]+@[A-Za-z0-9.-]+\\.[A-Za-z]{2,4}";

    NSPredicate *emailTest = [NSPredicate predicateWithFormat:@"SELF MATCHES %@", emailRegex];

    return [emailTest evaluateWithObject:email];

    

}

ASIFormDataRequest UPLOAD IMAGE TO THE SERVER

NSMutableDictionary *dic=[NSMutableDictionary dictionary];

        

        [dic setValue:@"Abdul Kareem" forKeyPath:@"user_name"];

        [dic setValue:@"signup" forKeyPath:@"action"];        

        [dic setValue:@"a.kareem.tn@gmail.com" forKeyPath:@"email"];

        [dic setValue:@"abc" forKeyPath:@"password"];

        [dic setValue:@"28" forKeyPath:@"age"];

        [dic setValue:@"Male" forKeyPath:@"gender"];

        [dic setValue:@"80" forKeyPath:@"weight"];

        [dic setValue:@"6" forKeyPath:@"height"];

        NSString *jsonRequest = [dic JSONRepresentation];

        jsonRequest =[jsonRequest stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding];

        NSURL *url = [NSURL URLWithString:[NSString stringWithFormat:@"%@%@",SERVIEC_URL,jsonRequest]];

        ASIFormDataRequest *request =[ASIFormDataRequest requestWithURL:url];

        [request setRequestMethod:@"POST"];

        

        [request addRequestHeader:@"User-Agent" value:@"ASIHTTPRequest"];

        [request addRequestHeader:@"Content-Type" value:@"application/json"];

        //[request appendPostData:[jsonRequest  dataUsingEncoding:NSUTF8StringEncoding]];

        if (imageData != nil) { ///for image data

            [request setData:imageData withFileName:@"image.jpg" andContentType:@"image/jpeg" forKey:@"picture"];

        }

       

        [request setDelegate:self];

        [request setShowAccurateProgress:YES];

        

        [request setUsername:"user name if you have on webservice"];

        [request setPassword:"password if you have on webservice"];

        [request startAsynchronous];

SIMPLE PROTOCOL & DELEGATE EXAMPLE

PROTOCOL & DELEGATE

two controllers

FirstViewController

SecondViewController

SecondViewController.h

@protocol SecondViewControllerDelegate;

@property (nonatomic, weak) id<SecondViewControllerDelegate> delegate;

@protocol SecondViewControllerDelegate <NSObject>

- (void)SecondViewController:(SecondViewController*)viewController

             didChooseValue:(CGFloat)value;

SecondViewController.m

-(IBAction)SecondTap:(id)sender

{

    id<SecondViewControllerDelegate> strongDelegate = self.delegate;

    

    // Our delegate method is optional, so we should

    // check that the delegate implements it

    

    if ([strongDelegate respondsToSelector:@selector(SecondViewController:didChooseValue:)]) {

        [strongDelegate SecondViewController:self didChooseValue:[sender tag]];

    }

}

FirstViewController.h

@interface FirstViewController : UIViewController<SecondViewControllerDelegate>

FirstViewController.m

-(IBAction)Add:(id)sender

{

    SecondViewController *objsecond =[[SecondViewController alloc]init];

    [objsecond setDelegate:self];

    [self.view addSubview:objsecond.view];

}

- (void)SecondViewController:(SecondViewController *)viewController didChooseValue:(CGFloat)value

{

    

    // Do something with value...

    

    // ...then dismiss the child view controller

    [viewController.view removeFromSuperview];

}

Generate PEM certificate from P12 certificate

Open terminal and go to the path where you place p12 certificate and run this complete below command:

openssl pkcs12 -in certificateName.p12 -out certificateName.pem -nodes

iOS Timer Counter !!

Here is the Timer counter simple example in which we will get seconds, minutes, and hours

Call the below method TimerCounter:

int secondsSpent;

NSTimer *timer= [NSTimer scheduledTimerWithTimeInterval:1.0 target:self selector:@selector(TimeCounter) userInfo:nil repeats:YES];

- (void)TimeCounter

{

    secondsSpent ++ ;

    hours = secondsSpent / 3600;

    minutes = (secondsSpent % 3600) / 60;

    seconds = (secondsSpent %3600) % 60;

    NSLog(@"Time spent: %02d:%02d:%02d", hours, minutes, seconds);

}

iOS Local Notifications

Here we have sample code for local notification

    UILocalNotification *notification = [[UILocalNotification alloc] init];

    notification.alertBody =@"Test Message";

    notification.soundName = UILocalNotificationDefaultSoundName;

    

    [[UIApplication sharedApplication] presentLocalNotificationNow:notification];

How null,nill, and lenght 0 object can be checked ???

The simplest way to check NSNull value , nill value, and lenght =0 of object:

static inline BOOL IsEmpty(id object)

{

    return object == nil

    || ([object respondsToSelector:@selector(length)]

        && [(NSData *) object length] == 0)

    || ([object respondsToSelector:@selector(count)]

        && [(NSArray *) object count] == 0)

    || ([object respondsToSelector:@selector(count)]

        && object == nil)

    || ([object respondsToSelector:@selector(count)]

        && [ object isKindOfClass:[NSNull class]]);

    

}

How to call inline function:

 NSString *str =nil;

    

    if(!(IsEmpty(str)))

    {

        NSLog(@"The object is not null, nill,");

    }