取消延时函数

时间：2014-05-13 08:17:19 收藏：0 阅读：219

- (void) networkReachabilityDidUpdate:(NetworkReachability*)reachability

{

    [NSObject cancelPreviousPerformRequestsWithTarget:self selector:@selector(reachabilityChanged) object:nil];

    

    [self performSelector:@selector(reachabilityChanged) withObject:nil afterDelay:0.1f];

}

//cancelPreviousPerformRequestsWithTarget是终止上次performSelector的Delay调用

//上面例子是防止在afterDelay时间内重复调用reachabilityChanged

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