NSTimer* nt = [NSTimerscheduledTimerWithTimeInterval:3target:selfselector:@selector(pressNext)userInfo:nilrepeats:NO];
//销毁定时器
[ntinvalidate];
NSTimer* nt = [NSTimerscheduledTimerWithTimeInterval:3target:selfselector:@selector(pressNext)userInfo:nilrepeats:NO];
//销毁定时器
[ntinvalidate];