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//调用系统api返回一个字典
NSDictionary *systemAttributes = [[NSFileManager defaultManager] fileSystemAttributesAtPath:NSHomeDirectory()];
//获取总容量
NSString *diskTotalSize = [systemAttributes objectForKey:@"NSFileSystemSize"];
// 获取剩余空间
NSString *diskFreeSize = [systemAttributes objectForKey:@"NSFileSystemFreeSize"];
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原文地址:http://www.cnblogs.com/ls1949/p/5216397.html