How to Wait in Objective-C and Swift

Question

I want to change my UILabel\'s text after 2 seconds.

I tried setting my UILabel\'s text to \"A text\", and use sleep(2) a

Answer 1

The follow method is good.

You can replace your

sleep(1);

with

dispatch_semaphore_t semaphore = dispatch_semaphore_create(0); dispatch_semaphore_wait(semaphore, dispatch_time(DISPATCH_TIME_NOW, 1 * NSEC_PER_SEC));