Question

I want to make a “downloading” uilabel whose label text will change dynamically when I call the method “updating”:

self.checkingArray = [NSArray arrayWithObjects:@"download", @"download.", @"download..", @"download...",
                 nil];

- (void) updating
{
    NSTimer *timer = [NSTimer scheduledTimerWithTimeInterval:0.5 target:self selector:@selector(changeText) userInfo:nil repeats:YES];
}

- (void) changeText
{
    checkLabel.text = [self.checkingArray objectAtIndex:curCheckingState];

    self.curCheckingState++;

    if (self.curCheckingState >= 4) {
    self.curCheckingState = 0;
}

But the label text stay with the text “download…”, I want to know how to achieve my purpose?

Answer 1

Implement this:

- (void) updating
{
    NSTimer *timer = [NSTimer scheduledTimerWithTimeInterval:1.0 target:self selector:@selector(changeText) userInfo:nil repeats:YES];
}

- (void) changeText
{
    static unsigned char state = 0;

    checkLabel.text = [self.checkingArray objectAtIndex:state];

    if(state < 3) state++;
    else state = 0;
}