Backport of the cell-to-nib registration API to iOS < 5.0

ADVTableView.h

//
//  Copyright © 2012 Yuri Kotov
//

#import <UIKit/UIKit.h>

@interface ADVTableView : UITableView

- (void) registerNib:(UINib *)nib forCellReuseIdentifier:(NSString *)identifier;

@end

ADVTableView.m

//
//  Copyright © 2012 Yuri Kotov
//

#import "ADVTableView.h"

@interface ADVTableView ()
@property (nonatomic, strong) NSMutableDictionary *mapping;
@end

@implementation ADVTableView

@synthesize mapping = _mapping;

#pragma mark - ADVTableView
- (NSMutableDictionary *) mapping
{
    if (!_mapping)
    {
        _mapping = [[NSMutableDictionary alloc] initWithCapacity:1];
    }
    return _mapping;
}

- (void) registerNib:(UINib *)nib forCellReuseIdentifier:(NSString *)identifier
{
    if ([[self superclass] instancesRespondToSelector:_cmd])
    {
        [super registerNib:nib forCellReuseIdentifier:identifier];
    }
    else
    {
        NSParameterAssert(nib != nil);
        NSParameterAssert(identifier != nil);
        [self.mapping setObject:nib forKey:identifier];
    }
}

#pragma mark - UITableView
- (id) dequeueReusableCellWithIdentifier:(NSString *)identifier
{
    id cell = [super dequeueReusableCellWithIdentifier:identifier];
    if (!cell && _mapping)
    {
        UINib *nib = [_mapping objectForKey:identifier];
        cell = [[nib instantiateWithOwner:nil options:nil] lastObject];
    }
    return cell;
}

#pragma mark - NSObject
#if !__has_feature(objc_arc)
- (void)dealloc
{
    [_mapping release];
    [super dealloc];
}
#endif

@end