perform block with delay

//------------------------------------------------------------------------------

// perform block with delay

//------------------------------------------------------------------------------

+ (void)doPerformBlock:(dispatch_block_t)block withDelay:(NSTimeInterval)delay

{

  dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(delay * NSEC_PER_SEC)), dispatch_get_main_queue(), block);
}

//------------------------------------------------------------------------------

// 사용법

//------------------------------------------------------------------------------

void (^block)(void) = ^(void)

{

  btn.enabled = YES;

};

[LibCommon doPerformBlock:block withDelay:0.5];