Remove Numbers From String ios

   NSString *trimmedString = nil;

    NSCharacterSet *numbersSet = [NSCharacterSet characterSetWithCharactersInString:@"0123456789"];

    trimmedString = [string stringByTrimmingCharactersInSet:numbersSet];

    return trimmedString;

Trimming Whitespaces from a string in ios

NSString *strUserName = [self.txtUsrNm.text stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceAndNewlineCharacterSet]];

Xcode Shortcuts

Swipe Gesture in iphone

UISwipeGestureRecognizer *swipeup=[[UISwipeGestureRecognizer  alloc]initwithTarget:self action:@selector(screenswiped)];
swipeup.numberOfTouchesRequired=1;
swipeup.direction=UISwipeGestureRecognizerDirectionUp;
[self.view addGestureRecognizer:swipeup];