https://blog.csdn.net/birenxiaofeigg/article/details/99555228?ops_request_misc=&request_id=&biz_id=102&utm_term=VS%20+%20Qt%20%E9%94%99%E8%AF%AFcannot%20open%20source%20f&utm_medium=distribute.pc_search_result.none-task-blog-2~all~sobaiduweb~default-2-99555228
還有一種情況：查看 屬性-》C/C++-》general 中是否包含這個ui_xxx.h文件的目錄。
