TiernanKennedy

    float count = 0.0;
    for (AVPlayerItem *playerItem in self.player.items) {
        CMTime duration = playerItem.asset.duration;
        float durationSeconds = CMTimeGetSeconds(duration);
        count = count + durationSeconds;
    }
    
    NSLog(@"total player duration: %.2f", count);

TiernanKennedy

    NSMutableDictionary* params = [[NSMutableDictionary alloc] init];
    
    if([invitations count] != 0){
        
        NSString * stringOfFriends = [invitations componentsJoinedByString:@","];
        
        [params setObject:stringOfFriends forKey:@"to"];
        
        NSLog(@"%@", params);
    }

TiernanKennedy

-(NSDictionary *) getDeviceData  {
    
    NSString *OSVersion = [[UIDevice currentDevice] systemVersion];
    NSString *deviceName = [self platformString];
    
    return @{@"OSVersion":OSVersion, @"deviceName":deviceName};
}


- (NSString *) platform{

TiernanKennedy

// Updates to LLVM give us better instantiation methods

NSNumber *n1 = @1000;  // [NSNumber numberWithInt:1000] 
NSNumber *n2 = @3.1415926; // [NSNumber numberWithDouble:3.1415926]
NSNumber *c = @'c'; // [NSNumber numberWithChar:'c']
NSNumber *b = @YES; // [NSNumber numberWithBool:YES]

Arrays
// before
NSArray *words = [NSArray arrayWithObjects:@"list", @"of", @"words", nil];

TiernanKennedy

// To create a method that accepts an integer (int) and returns that integer squared
 
- (void)viewDidLoad
{
    [super viewDidLoad];
  
    // first we delare our integer
    int myInt = 666

    // now look what's happening here - it will print "666 squared is 443556"

TiernanKennedy

// first add a clear button that covers the screen
   
// Now  add a gesture recognizer in ViewDidLoad
// with target "self" (this class)
// and selector (method) "hideCamera"
UISwipeGestureRecognizer* upSwipeRecognizer = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(hideCamera)];

// set the direction of the swipe to up
[upSwipeRecognizer setDirection:UISwipeGestureRecognizerDirectionUp];

TiernanKennedy

-(void)loadDocument:(NSString*)documentName inView:(UIWebView*)webView
{
    NSString *path = [[NSBundle mainBundle] pathForResource:documentName ofType:nil];
    
    NSURL *url = [NSURL fileURLWithPath:path];
    NSURLRequest *request = [NSURLRequest requestWithURL:url];
    [webView loadRequest:request];
}

[self loadDocument:@"iPhoneLibrary.key" inView:self.webView];