崩溃时控制台打印信息：
CFURLCopyResourcePropertyForKey failed because it was passed an URL which has no scheme
*** Assertion failure in -[UIDocumentInteractionController setURL:]
*** Terminating app due to uncaught exception 'NSInternalInconsistencyException', reason: 'UIDocumentInteractionController: invalid scheme (null). Only the file scheme is supported.'
代码如下：
导致崩溃的写法
解决办法：路径String转URL的时候使用fileURLWithPath:方法。
正确写法
也可参考：
ios - UIDocumentInteractionController "invalid scheme (null)" - Stack Overflow
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