Question

I have this code to change the number in the NSString every five seconds.

How will I keep the numbers running in a loop? It now runs from 1 to 19 ,and stops at the last one (19) with a SIGABRT on the line: label.text = ...

How can I start with the first number displayed (0), before the first timer fires?

Here is the code:

-(IBAction) rotate3

{


    NSString *number = [self.dayArray description];

    NSArray *array = [[NSArray alloc] initWithObjects: @"0", @"1", @"2",..., @"19",nil];

    number =  @"0" ;
    numberCount++ ;


    self.dayArray = array;
    [array release];


    label.text = [NSString stringWithFormat:@"Day: %@ ", [dayArray objectAtIndex   :numberCount ]];


}

//and the timer

- (void)viewDidLoad

{

    timer=[NSTimer scheduledTimerWithTimeInterval:5.0 target:self selector:@selector(rotate3 )userInfo:nil repeats:YES];

}

Answer 1

add this to your .h file, in your interface (that is, if it isn’t already there)

{
    NSInteger numberCount
}

Then in your viewDidLoad method, initialize numberCount and the label:

numberCount = 0;
label.text = @"0";

And in your time method, replace:

numberCount++

with

if(numberCount++ > 19)
    numberCount = 0;

What is the “number” NSString used for, b.t.w.?