我认为这是一种很好的使用方法.您可以定义对象及其选择器，以便在一段时间后，计时器将调用类似 [targer performSelector:aSelector];

I think this is one of the good methods to use. You can define the object and its selector so that after a period of time, the timer will call something like [targer performSelector:aSelector];

+ (NSTimer *)scheduledTimerWithTimeInterval:(NSTimeInterval)seconds target:(id)target selector:(SEL)aSelector userInfo:(id)userInfo repeats:(BOOL)repeats

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