//用nstimer的用法 一种用法，要手动加入到NsRunLoop中

     NSTimer *time= [NSTimer timerWithTimeInterval: target:self selector:@selector(NoticeTransation) userInfo:nil repeats:YES];

    [[NSRunLoop currentRunLoop] addTimer:time forMode:NSDefaultRunLoopMode];//手动加入到NSRunLoop中

    [time fire];//立即触发定时器

    //第二种方法

   NSTimer *timer= [NSTimer scheduledTimerWithTimeInterval: target:self selector:@selector(NoticeTransation) userInfo:nil repeats:YES];

    [timer fire];