需要在IOS中设置延迟功能

需要一个延时器，进行23秒的延迟然后执行函数。应该怎么实现？用不用NSTimer？

performSelector: withObject: afterDelay:

简单点的话,使用performSelector: withObject: afterDelay: 方法

[self performSelector:@selector(delayMethod:) withObject:nil afterDelay:23];