(親測)designer運行報錯:This application failed to start because no Qt platform plugin could be initialized
1.現象: 點擊之後,出現: 2.原因: 沒有添加系統環境變量。 3.解決辦法: 添加系統環境變量。 4.解決步驟: 4.1打開控制面板，且在控制面板搜索欄輸入"系統" 4.2選擇高級設置 4.3點擊環境變量 4.4點擊新建 4.5輸入，確定。 ps： 變量名：QT_QPA_PLATFORM_PLUGIN_PATH。 變量值：pyqtX_tools中的與designer同級的plugins文件夾路
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