iOS 9 Undeclared selector

Question

Why after updating to iOS 9 does this line of code not work?

The warning is Undeclared selector 'performThisMethod:_ImageData

The app crashes on the [self performSelector:]

[self performSelector:@selector(performThisMethod:_ImageData:)withObject:nil afterDelay:0.05f];

-(void) performThisMethod : (NSData *) data {
     NSLog(@"Testing this Method");

  }

What has Apple changed?

Apple did not change anything, that code probably was never compilable — luk2302, Oct 17 '15 at 17:35

score 1 · Answer 1 · answered Oct 17 '15 at 17:32

1

You are using performSelector incorrectly. You want:

[self performSelector:@selector(performThisMethod:) withObject:_ImageData afterDelay:0.05f];

Better yet, use dispatch_after:

dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(0.05 * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{
    [self performThisMethod:_ImageData];
});

answered Oct 17 '15 at 17:32

rmaddy

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Glad I could help. Please don't forget to accept an answer that solved your issue. This indicates the question is complete and it increases your reputation. – rmaddy Oct 17 '15 at 17:48

score 0 · Answer 2 · edited May 23 '17 at 12:14

0

Your code should probably be

[self performSelector:@selector(performThisMethod:) withObject:_ImageData afterDelay:0.05f];

Take a look at this question answers to better understand the performSelector behaviour.

edited May 23 '17 at 12:14

Community

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answered Oct 17 '15 at 17:32

luk2302

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iOS 9 Undeclared selector

2 Answers2