设置launchImage显示的时间

- (void)viewDidLoad
{
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
[NSThread sleepForTimeInterval:2.0];   //设置进程停止2秒
}

override func viewDidLoad() {
super.viewDidLoad()
NSThread.sleepForTimeInterval(3.0)//延长3秒
}