cancelPreviousPerformRequestsWithTarget的使用
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- (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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