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Call a function as soon as uitextfiled looses focus in iOS
// Dismiss Keyboard

- (void)touchesEnded: (NSSet *)touches withEvent: (UIEvent *)event {
    for (UIView* view in self.view.subviews) {
        if ([view isKindOfClass:[UITextField class]])
        {
            [view resignFirstResponder];
            [self validationForNoOfPassengers];
        }

    }
}

void
do_something(void)
{
    return;
}

/* ... */

- (void)textFieldDidEndEditing:(UITextField *)textField
{
    do_something();
}

#import <UIKit/UIKit.h>
@interface MyView : UIView
@property (weak, nonatomic) IBOutlet UITextField *textField;
@end

#import "MyView.h"
@implementation MyView
@synthesize textField;
- (UIView *)hitTest:(CGPoint)point withEvent:(UIEvent *)event
{
    UIView *hitView = [super hitTest:point withEvent:event];
    return (hitView != self.textField
        && self.textField.isFirstResponder
        && ![self.textField resignFirstResponder])
        ? nil : hitView;
}
@end

#import "MyView.h"

@protocol MyViewFirstResponderProtocol
// Have to declare the message so the compiler will allow it.
- (UIResponder *)firstResponder;
@end

@implementation MyView
@synthesize textField;
- (UIView *)hitTest:(CGPoint)point withEvent:(UIEvent *)event
{
    NSLog(@"hitTest for event %@", event);
    UIView *hitView = [super hitTest:point withEvent:event];
    UIResponder *firstResponder = [(id)self.window firstResponder];
    return (firstResponder
        && hitView != firstResponder
        && ![firstResponder resignFirstResponder])
        ? nil : hitView;
}
@end