Tab Bar Controller in Objective-C – Example (Video)

To download the project for this post, click HERE.

In this tutorial you will see how to work with a Tab Bar Controller, and how to work independently with each of the views that make up this Tab Bar Controller. In this video tutorial we will build the following app. The third view of this tutorial corresponds to the following tutorial: NSTimer in Objective-C -Example- (Video).

Here is the video of the finished project:

Below are the methods we used to get the date and time in the example app:

Code to get the current date:

// Get today's date
NSDate *hoy = [NSDate dateWithTimeIntervalSinceNow:0];

// Format it and store it in the NSString fecha so we can print it
NSDateFormatter *dateFormat = [[NSDateFormatter alloc] init];
[dateFormat setDateFormat:@"dd-MMMM-yyy"];
NSString *fecha = [dateFormat stringFromDate:hoy];

Code to get the time. To make it update every second, you should use a timer that calls this method every half second (more or less):

-(void) setHora{
    // Get today's date
    NSDate *hoy = [NSDate dateWithTimeIntervalSinceNow:0];

    // Calculate hours, minutes and seconds
    NSCalendar *gregorian = [[NSCalendar alloc] initWithCalendarIdentifier:NSGregorianCalendar];
    NSDateComponents *dateComponents = [gregorian components:(NSHourCalendarUnit  | NSMinuteCalendarUnit | NSSecondCalendarUnit) fromDate:hoy];
    NSInteger horas = [dateComponents hour];
    NSInteger minutos = [dateComponents minute];
    NSInteger segundos2 = [dateComponents second];

    NSString *hora = [NSString stringWithFormat:@"%02i:%02i:%02i",horas, minutos, segundos2];
}