//延時函式：[NSThread sleepForTimeInterval:5.0]； //暫停5s.

//Timer的使用：NSTimer *connectionTimer;  //timer物件

//例項化timerself.connectionTimer=[NSTimer scheduledTimerWithTimeInterval:1.5 target:self selector:@selector(timerFired:) userInfo:nil repeats:NO];
[[NSRunLoop currentRunLoop]addTimer:self.connectionTimer forMode:NSDefaultRunLoopMode];
//
 
用timer作為延時的一種方法   do{
[[NSRunLoopcurrentRunLoop]runUntilDate:[NSDatedateWithTimeIntervalSinceNow:1.0]];
}while(!done); 

//timer呼叫函式-(void)timerFired:(NSTimer *)timer{
done =YES;
}