Values of type 'NSInteger' should not be used as format arguments; add an explic

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Values of type 'NSInteger' should not be used as format arguments; add an explicit cast to 'long' instead的产生原因

#if __LP64__ || (TARGET_OS_EMBEDDED && !TARGET_OS_IPHONE) || TARGET_OS_WIN32 || NS_BUILD_32_LIKE_64
typedef long NSInteger;
#else
typedef int NSInteger;
#endif

因为在64位下，NSInteger被定义为long；
32位下，被定义为int；
所以在64为下：NSString *strUrl = [NSString stringWithFormat:@"%ld", (long)category];