Question

i want a timer wich is starting if a button is pressed.
while the timer is running, it is not possible to press the button again. and a alert will show up..
have you an idea how to realize it?
Tank you!

Answer 1

Create an NSTimer the first time the button is pressed, and while the timer is valid, don’t allow the action to happen, and popup your alert.

Store your NSTimer in a property on your object.

Interface:

@property (strong, nonatomic) NSTimer *timer;

Implementation:

- (IBAction)buttonClicked:(id)sender
{
    if(self.timer == nil || ![self.timer isValid]) {
        // Allow the action (set the timer interval to what suits your needs)
        self.timer = [NSTimer scheduledTimerWithTimeInterval:1.0 invocation:nil repeats:NO];

        // DO THE ACTION HERE!
        NSLog(@"You can do it this time!");
    } else {
        // Deny the action (perhaps popup an alert)
        NSLog(@"Can't do that yet!");
    }
}