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NSFileManager *mgr = [NSFileManager defaultManager];
NSString *cachePath =
[NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES) lastObject];
[mgr removeItemAtPath:cachePath error:nil];
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原文地址:http://www.cnblogs.com/lifengfneg/p/4774050.html