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@implementation NSDictionary (Values)
 
- (id)valueForKeyPath:(NSString *)keyPath
{
    __block id value = nil;
     
    if (keyPath != nil) {
        NSArray *keys = [keyPath componentsSeparatedByString:@"."];
        if (keys && [keys count] > 0) {
            [keys enumerateObjectsUsingBlock:^(id obj, NSUInteger idx, BOOL *stop) {

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// How to check the end of an audio
AVAsset *asset = [AVURLAsset URLAssetWithURL:your-url options:nil];
AVPlayerItem *anItem = [AVPlayerItem playerItemWithAsset:asset];
self.player = [AVPlayer playerWithPlayerItem:anItem];
    
    __weak typeof(self) wself = self;
    CMTime interval = CMTimeMake(1, 1);
    id observer = [self.soundPlayer addPeriodicTimeObserverForInterval:interval queue:dispatch_get_main_queue() usingBlock:^(CMTime time) {
        // controlla la fine dell'audio
        CMTime duration = CMTimeConvertScale(wself.player.currentItem.duration, wself.player.currentTime.timescale, kCMTimeRoundingMethod_Default);

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- (void)dealloc
{
	[NSObject cancelPreviousPerformRequestsWithTarget:self];
    	[[NSNotificationCenter defaultCenter] removeObserver:self];
    
	if ([self respondsToSelector:@selector(setDelegate:)])
        	[self performSelector:@selector(setDelegate:) withObject:nil];
    
	[super dealloc]; // not needed in ARC
}

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// Fix the crash in iOS6 when you start a not supported video stream
// note: do not use initWithUrl, instead use setContentURL
MPMoviePlayerViewController viewController = [[MPMoviePlayerViewController alloc] init];
viewController.moviePlayer.movieSourceType = MPMovieSourceTypeStreaming;
viewController.moviePlayer.controlStyle = MPMovieControlStyleFullscreen;
[viewController.moviePlayer setContentURL:url];

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// Loading the XIB dependent on the device
//
// 1. create your viewcontroller's named MyViewController~ipad.xib and MyViewController~iphone.xib
//
// 2. inizialize your class with MyViewController myvc = [[MyViewController alloc] initWithDefaultNib];
//

- (id)initWithDefaultNib
{
    NSString *nibName =[[[[[NSBundle mainBundle] pathForResource: NSStringFromClass([self class]) ofType:@"nib"] componentsSeparatedByString:@"/"] lastObject] stringByReplacingOccurrencesOfString:@".nib" withString:@""];

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static NSDictionary *settings;

+ (id)settingsValueForKeyPath:(NSString*)keyPath
{
    if (settings == nil) {
        NSString *plistPath = [[[NSBundle mainBundle] bundlePath] stringByAppendingPathComponent:@"settings.plist"];
        settings = [[NSDictionary alloc] initWithContentsOfFile:plistPath];
    }
    
    return [settings valueForKeyPath:keyPath];

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// How to get duration (HH:MM:SS) from AVAudioPlayer
AVAudioPlayer *audioPlayer =  [[AVAudioPlayer alloc] initWithContentsOfURL:[NSURL URLWithString:@"you-url-sreaming"] error:nil];
[audioPlayer prepareToPlay];
CMTime duration = [[[audioPlayer currentItem] asset] duration];
float seconds = CMTimeGetSeconds(duration);
NSLog("Duration : %@", [NSString stringWithFormat:@"%02d:%02d:%02d", (int)((int)(seconds)) / 3600, (int)((int)(seconds)) / 60, (int)((int)(seconds)) % 60]);

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// NSObject set property values with NSDictionary
- (void)setValuesWithDictionary:(NSDictionary *)dict
{
    if (dict != nil) {
        [dict enumerateKeysAndObjectsUsingBlock:^(id key, id obj, BOOL *stop) {
            NSString *setPropName = [NSString stringWithFormat:@"set%@%@:", [[key substringWithRange:(NSRange){0, 1}] uppercaseString], [key substringFromIndex:1]];
            if ([self respondsToSelector:NSSelectorFromString(setPropName)])
                [self setValue:obj forKey:key];
        }];
    }

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#include <sys/socket.h>
#include <arpa/inet.h>
#include <netdb.h>
#include <sys/types.h>
#include <ifaddrs.h>
#include <net/if.h>

- (NSArray *)localIPAddresses
{
    NSMutableArray *ipAddresses = [NSMutableArray array] ;

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//  fix the wrong value of sizeThatFits in a UITableViewCell for iOS8
//  UITableViewCell+iOS8.h
#import <UIKit/UIKit.h>

@interface UITableViewCell (iOS8)

- (CGSize)sizeThatFitsiOS8:(CGSize)size;

@end