(亲测)designer运行报错:This application failed to start because no Qt platform plugin could be initialized
1.现象: 点击之后,出现: 2.原因: 没有添加系统环境变量。 3.解决办法: 添加系统环境变量。 4.解决步骤: 4.1打开控制面板，且在控制面板搜索栏输入"系统" 4.2选择高级设置 4.3点击环境变量 4.4点击新建 4.5输入，确定。 ps： 变量名：QT_QPA_PLATFORM_PLUGIN_PATH。 变量值：pyqtX_tools中的与designer同级的plugins文件夹路
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