我没有使用 CTRun 的实践经验，但从文档看来

I do not have practical experience with CTRun, but from the documentation is seems that

 CTRunStatus CTRunGetStatus(CTRunRef run)

返回你需要的信息，返回值是一个位域:

returns the information you need, the return value is a bitfield:

enum {
   kCTRunStatusNoStatus = 0,
   kCTRunStatusRightToLeft = (1 << 0),
   kCTRunStatusNonMonotonic = (1 << 1),
   kCTRunStatusHasNonIdentityMatrix = (1 << 2)
};
typedef uint32_t CTRunStatus;