jlcampana

//Assuming the view controller's size is WIDTHxHEIGHT

//Calling the view Controller:
    CustomViewController *vc = [[CustomViewController alloc] init];
    vc.modalPresentationStyle = UIModalPresentationFormSheet;
    [self presentModalViewController:vc animated:YES];

//In the view controller:
-(void)viewWillAppear:(BOOL)animated
{

jlcampana

    [UIView animateWithDuration:DURATION
                          delay:0.0
                        options: UIViewAnimationCurveEaseOut
                     animations:^{


                     } 
                     completion:^(BOOL finished){
                         
                     }];

jlcampana

ProductView *v = [[[NSBundle mainBundle] loadNibNamed:@"ProductView" owner:self options:nil] objectAtIndex:0];

jlcampana

CGSize expectedLabelSize = [yourString sizeWithFont:yourLabel.font 
                        constrainedToSize:maximumLabelSize 
                        lineBreakMode:yourLabel.lineBreakMode]; 

jlcampana

//Vamos a observar la propiedad cartUnits del objeto _product
[_product addObserver:self forKeyPath:@"cartUnits" options:NSKeyValueObservingOptionNew|NSKeyValueObservingOptionOld context:nil];

-(void)observeValueForKeyPath:(NSString *)keyPath ofObject:(id)object change:(NSDictionary *)change context:(void *)context
{
    if([keyPath isEqualToString:@"cartUnits"])
    {
        //Acción
    }
}

jlcampana

+(NSInteger)getRandomIntBetween:(NSInteger)min andMax:(NSInteger)max
{
    return min + arc4random() % ((max + 1) - min);
}

jlcampana

+(natural_t) getFreeMemory
{
    mach_port_t host_port;
    mach_msg_type_number_t host_size;
    vm_size_t pagesize;
    host_port = mach_host_self();
    host_size = sizeof(vm_statistics_data_t) / sizeof(integer_t);
    host_page_size(host_port, &pagesize);
    vm_statistics_data_t vm_stat;
    if (host_statistics(host_port, HOST_VM_INFO, (host_info_t)&vm_stat, &host_size) != KERN_SUCCESS) {

jlcampana

+(BOOL)orientationIsPortrait
{
    return UIDeviceOrientationIsPortrait([[UIApplication sharedApplication] statusBarOrientation]);
}

+ (UIInterfaceOrientation) interfaceOrientation
{
    return [[UIApplication sharedApplication] statusBarOrientation];
}

jlcampana

+(NSString *)getTimeAgo:(NSDate *)fecha
{
    NSString *timeAgo;
    float since_mins,since_hours, since_days, since_months, since_years;

    NSTimeInterval since = fabs([fecha timeIntervalSinceNow]);
    since_mins = (since / 60);
    since_hours = (since_mins / 60);
    since_days = (since_hours / 24);
    since_months = (since_days / 31);

jlcampana

+ (CGPoint)getFirstTransparentPixelOfImage:(UIImage*)image
{

    int xx = 0;
    int yy = 0;
    int count = image.size.width * image.size.height;
    
    
    // First get the image into your data buffer
    CGImageRef imageRef = [image CGImage];