https://dogpa0130.medium.com/swift-practice-170-swiftui-map%E5%A4%9A%E5%9C%B0%E9%BB%9E%E9%A1%AF%E7%A4%BA%E8%88%87span%E5%A4%A7%E5%B0%8F-5a3f651b6be3
