苹果开发初学者指南：Xcode 如何为运行的 App 添加环境变量（Environmental Variable）Xcode 15 在运行 SwiftUI 代码时突然报告如下警告：Error: this application, or a library it uses, has passed an invalid numeric value (NaN, or not-a-number) to CoreGraphics API and this value is being ignored. Please fix this problem.