获取系统存储空间大小

NSFileManager *fm = [NSFileManager defaultManager];

NSDictionary *fattributes = [fm fileSystemAttributesAtPath:NSHomeDirectory()];

NSLog(@"System space: %@",[self commasForNumber:([[fattributes objectForKey:NSFileSystemSize] longLongValue])]);

NSLog(@"System free space: %@",[self commasForNumber:([[fattributes objectForKey:NSFileSystemFreeSize] longLongValue])]);

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