Creating a method in objective-c with a delay argument

Question

I'm trying to create a method with an argument in objective-c, the argument is an amount of seconds before the actual method starts.

I'm trying to avoid using the [self performSelector:(SEL) withObject:(id) afterDelay:(NSTimeInterval)]; because having the delay within my method would actually save me a lot of coding as I am planning to add other arguments to this method.

Example of the method:

-(void) startMethodAfterArgumentDelay: (NSTimeInterval *)delay{
     NSLog(@"perform action after argument delay");
}

and how to call it:

[self startMethodAfterArgumentDelay:3.0f];

Any help would be greatly appreciated!

score 2 · Accepted Answer · answered Mar 14 '15 at 17:41

If you don't want to use any 3rd party libraries as the other answer suggested, this is easy enough to implement yourself using GCD's dispatch_after(). Just note that this method is a asynchronous, so your method will return immediately even though the contents of the block are delayed.

- (void)startMethodAfterArgumentDelay:(NSTimeInterval)delay
{
    dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(delay * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{
        NSLog(@"perform action after argument delay");
    });
}

Brilliant!! After I changed NSTimeInterval to a float, this worked flawlessly! Thank you — PhilBlais, Mar 14 '15 at 18:04

score 1 · Answer 2 · answered Mar 14 '15 at 17:39

1

You can use BlocksKit and then write code like that:

[self bk_performBlock:^(id obj) {
    //code
} afterDelay:delay];

answered Mar 14 '15 at 17:39

Azat

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score 1 · Answer 3 · answered Mar 14 '15 at 17:41

1

Just feed delay to dispatch_after.

dispatch_time_t popTime = dispatch_time(DISPATCH_TIME_NOW, (int64_t)(delay * NSEC_PER_SEC));
dispatch_after(popTime, dispatch_get_main_queue(), ^(void) {
    // do whatever
});

answered Mar 14 '15 at 17:41

matt

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Creating a method in objective-c with a delay argument

3 Answers3