This is an example of an Utility class which is useful to manage multiple xib files for different views for iPhone 4 and iPhone 5. This is an example of use : MyViewController *controller = [[MyViewController alloc] initWithNibName:[Utility nibName:@"MyNibName"] bundle:nil]; The class check if the xib to load will have to be the one for the iPho…

SWPUtility.h

//
//  SWPUtility.h
//  
//
//  Created by Andrea Lufino on 06/02/13.
//  Copyright 2013 Andrea Lufino. All rights reserved.

#import <Foundation/Foundation.h>

@interface SWPUtility : NSObject

//Class method
+ (SWPUtility *) shared;

/*
 * Instance methods
 */
+ (NSString *)nibNamed:(NSString *)nibName;

@end

SWPUtility.m

//
//  SWPUtility.m
//  
//
//  Created by Andrea Lufino on 06/02/13.
//  Copyright 2013 Andrea Lufino. All rights reserved.

#import "SWPUtility.h"

@implementation SWPUtility

#pragma mark - Singleton methods

+ (SWPUtility *)shared {
	static SWPUtility *_shared;
	if(!_shared) {
		static dispatch_once_t oncePredicate;
		dispatch_once(&oncePredicate, ^ {
			_shared = [[super allocWithZone:nil] init];
		});
	}
	return _shared;
}

+ (id)allocWithZone:(NSZone *)zone  { return [self shared]; }
- (id)copyWithZone:(NSZone *)zone   { return self;          }
#if (!__has_feature(objc_arc))
- (id)retain                        { return self;          }
- (unsigned)retainCount             { return UINT_MAX;      }
- (void)release                     {                       }
- (id)autorelease                   { return self;          }
#endif

#pragma mark - Custom methods

//check the device and load the correct view
+ (NSString *)nibNamed:(NSString *)nibName {
    [self shared];
    if (UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiomPhone) {
        if ([[UIScreen mainScreen] bounds].size.height > 480.0f) {
            NSLog(@"Load iPhone 5 views");
            return [NSString stringWithFormat:@"%@_iPhone5", nibName];
        } else {
            NSLog(@"Load iPhone 4 and less views");
            return [NSString stringWithFormat:@"%@_iPhone4", nibName];
        }
    } else {
        NSLog(@"Recognized an iPad. Load iPhone 5 views");
        return [NSString stringWithFormat:@"%@_iPhone5", nibName];
	//manage iPad view, if you have one
    }
}

@end