Method to know the freesize and total space in an apple device

-(float)getTotalDiskSpaceInBytes {
    float totalSpace = 0.0f;
    NSError *error = nil;
    NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
    NSDictionary *dictionary = [[NSFileManager defaultManager] attributesOfFileSystemForPath:[paths lastObject] error: &error];
    
    if (dictionary) {
        //gives total space in the device
        NSNumber *fileSystemSizeInBytes = [dictionary objectForKey: NSFileSystemSize];
        //gives the free space in device
        NSNumber *usedSpaceInBytes = [dictionary objectForKey: NSFileSystemFreeSize];

        totalSpace = [fileSystemSizeInBytes floatValue];
    } else {
        //DLog(@”Error Obtaining File System Info: Domain = %@, Code = %@”, [error domain], [error code]);
        NSLog(@”Error Obtaining File System Info: Domain = %@, Code = %ld”, [error domain], (long)[error code]);
    }
    
    return totalSpace;
}

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Method to find in which device our app is running

– (NSString *) platformString {
    // Gets a string with the device model
    size_t size;
    sysctlbyname(“hw.machine”, NULL, &size, NULL, 0);
    char *machine = malloc(size);
    sysctlbyname(“hw.machine”, machine, &size, NULL, 0);
    NSString *platform = [NSString stringWithCString:machine encoding:NSUTF8StringEncoding];
    free(machine);
    
    if ([platform isEqualToString:@”iPhone1,1″])    return @”iPhone 2G”;
    if ([platform isEqualToString:@”iPhone1,2″])    return @”iPhone 3G”;
    if ([platform isEqualToString:@”iPhone2,1″])    return @”iPhone 3GS”;
    if ([platform isEqualToString:@”iPhone3,1″])    return @”iPhone 4″;
    if ([platform isEqualToString:@”iPhone3,2″])    return @”iPhone 4″;
    if ([platform isEqualToString:@”iPhone3,3″])    return @”iPhone 4 (CDMA)”;
    if ([platform isEqualToString:@”iPhone4,1″])    return @”iPhone 4S”;
    if ([platform isEqualToString:@”iPhone5,1″])    return @”iPhone 5″;
    if ([platform isEqualToString:@”iPhone5,2″])    return @”iPhone 5 (GSM+CDMA)”;
    
    if ([platform isEqualToString:@”iPod1,1″])      return @”iPod Touch (1 Gen)”;
    if ([platform isEqualToString:@”iPod2,1″])      return @”iPod Touch (2 Gen)”;
    if ([platform isEqualToString:@”iPod3,1″])      return @”iPod Touch (3 Gen)”;
    if ([platform isEqualToString:@”iPod4,1″])      return @”iPod Touch (4 Gen)”;
    if ([platform isEqualToString:@”iPod5,1″])      return @”iPod Touch (5 Gen)”;
    
    if ([platform isEqualToString:@”iPad1,1″])      return @”iPad”;
    if ([platform isEqualToString:@”iPad1,2″])      return @”iPad 3G”;
    if ([platform isEqualToString:@”iPad2,1″])      return @”iPad 2 (WiFi)”;
    if ([platform isEqualToString:@”iPad2,2″])      return @”iPad 2″;
    if ([platform isEqualToString:@”iPad2,3″])      return @”iPad 2 (CDMA)”;
    if ([platform isEqualToString:@”iPad2,4″])      return @”iPad 2″;
    if ([platform isEqualToString:@”iPad2,5″])      return @”iPad Mini (WiFi)”;
    if ([platform isEqualToString:@”iPad2,6″])      return @”iPad Mini”;
    if ([platform isEqualToString:@”iPad2,7″])      return @”iPad Mini (GSM+CDMA)”;
    if ([platform isEqualToString:@”iPad3,1″])      return @”iPad 3 (WiFi)”;
    if ([platform isEqualToString:@”iPad3,2″])      return @”iPad 3 (GSM+CDMA)”;
    if ([platform isEqualToString:@”iPad3,3″])      return @”iPad 3″;
    if ([platform isEqualToString:@”iPad3,4″])      return @”iPad 4 (WiFi)”;
    if ([platform isEqualToString:@”iPad3,5″])      return @”iPad 4″;
    if ([platform isEqualToString:@”iPad3,6″])      return @”iPad 4 (GSM+CDMA)”;
    
    if ([platform isEqualToString:@”i386″])         return @”Simulator”;
    if ([platform isEqualToString:@”x86_64″])       return @”Simulator”;
    
    return platform;
}

moving view when keyboard pops up..

CGFloat animatedDistance;

static const CGFloat KEYBOARD_ANIMATION_DURATION = 0.3;

static const CGFloat MINIMUM_SCROLL_FRACTION = 0.2;

static const CGFloat MAXIMUM_SCROLL_FRACTION = 0.8;

static const CGFloat PORTRAIT_KEYBOARD_HEIGHT = 216;

static const CGFloat LANDSCAPE_KEYBOARD_HEIGHT = 162;

 

 

 

#pragma mark Textfield Delegates

– (BOOL)textFieldShouldReturn:(UITextField *)textField

{

[textField resignFirstResponder];

return YES;

}

 

 

– (void)textFieldDidBeginEditing:(UITextField *)textField

{

   //ErrorMsg.text = @””;

    CGRect textFieldRect =

[self.view.window convertRect:textField.bounds fromView:textField];

    CGRect viewRect =

[self.view.window convertRect:self.view.bounds fromView:self.view];

 

CGFloat midline = textFieldRect.origin.y + 0.5 * textFieldRect.size.height;

    CGFloat numerator =

midline – viewRect.origin.y

– MINIMUM_SCROLL_FRACTION * viewRect.size.height;

    CGFloat denominator =

(MAXIMUM_SCROLL_FRACTION – MINIMUM_SCROLL_FRACTION)

* viewRect.size.height;

    CGFloat heightFraction = numerator / denominator;

 

if (heightFraction < 0.0)

    {

        heightFraction = 0.0;

    }

    else if (heightFraction > 1.0)

    {

        heightFraction = 1.0;

    }

 

UIInterfaceOrientation orientation =

[[UIApplication sharedApplication] statusBarOrientation];

    if (orientation == UIInterfaceOrientationPortrait ||

        orientation == UIInterfaceOrientationPortraitUpsideDown)

    {

        animatedDistance = floor(PORTRAIT_KEYBOARD_HEIGHT * heightFraction);

    }

    else

    {

        animatedDistance = floor(LANDSCAPE_KEYBOARD_HEIGHT * heightFraction);

    }

 

CGRect viewFrame = self.view.frame;

    viewFrame.origin.y -= animatedDistance;

    

    [UIView beginAnimations:nil context:NULL];

    [UIView setAnimationBeginsFromCurrentState:YES];

    [UIView setAnimationDuration:KEYBOARD_ANIMATION_DURATION];

    

    [self.view setFrame:viewFrame];

    

    [UIView commitAnimations];

}

 

– (void)textFieldDidEndEditing:(UITextField *)textField

{

    if (textField==tfEmail) {

      BOOL boolValidEmail=  [self NSStringIsValidEmail:tfEmail.text];

        if (!boolValidEmail) {

            

            [[[UIAlertView alloc]initWithTitle:@”Email alert” message:@”Invalid Email format” delegate:self cancelButtonTitle:@”Ok” otherButtonTitles:nil, nil]show ];

            registerBtn.enabled=NO;

 

        }

    }

    

    

    if (textField==tfConfirmEmail) {

        

        if (tfEmail.text!=tfConfirmEmail.text ) {

            [[[UIAlertView alloc]initWithTitle:@”Email alert” message:@”Emails doesn’t match” delegate:self cancelButtonTitle:@”Ok” otherButtonTitles:nil, nil]show ];

            registerBtn.enabled=NO;

 

        }

    }

    

    

    

    CGRect viewFrame = self.view.frame;

    viewFrame.origin.y += animatedDistance;

    

    [UIView beginAnimations:nil context:NULL];

    [UIView setAnimationBeginsFromCurrentState:YES];

    [UIView setAnimationDuration:KEYBOARD_ANIMATION_DURATION];

    [self.view setFrame:viewFrame];

    [UIView commitAnimations];

    

    

    

}

 

Email validation in Objective c

-(BOOL) NSStringIsValidEmail:(NSString *)checkString
{
   BOOL stricterFilter = YES; // Discussion http://blog.logichigh.com/2010/09/02/validating-an-e-mail-address/
   NSString *stricterFilterString = @"[A-Z0-9a-z._%+-]+@[A-Za-z0-9.-]+\\.[A-Za-z]{2,4}";
   NSString *laxString = @".+@.+\\.[A-Za-z]{2}[A-Za-z]*";
   NSString *emailRegex = stricterFilter ? stricterFilterString : laxString;
   NSPredicate *emailTest = [NSPredicate predicateWithFormat:@"SELF MATCHES %@", emailRegex];
   return [emailTest evaluateWithObject:checkString];
}

Resizing the imageView in objective-c

 if (img) {

                NSLog(@”iPhone Standard Resolution”);

                CGSize size=CGSizeMake(250, 108);

                UIGraphicsBeginImageContext(size);

                [img drawInRect:CGRectMake(0,0,size.width,size.height)];

                UIImage* newImage = UIGraphicsGetImageFromCurrentImageContext();

                UIGraphicsEndImageContext();

                // [backgroundImage removeFromSuperview];

                [detailImage setImage:newImage];

            }