YuiGuizhichen
您好 `let coordinate = CLLocationCoordinate2D(latitude: 29.554987, longitude: 115.984963)` 在注释掉上行代码后添加 `var coordinate: CLLocationCoordinate2D` 并在 PreviewProvider 中给 MapView() 添加 `MapView(coordinate: landmarkData[0].locationCoordinate)` 预览视图就报错了，求解，感谢🙏 代码 <img width="662" alt="image" src="https://user-images.githubusercontent.com/49800659/86997313-58827080-c1e0-11ea-94dd-9f1e83ab69e4.png"> 错误信息 <img width="559" alt="image" src="https://user-images.githubusercontent.com/49800659/86997397-8798e200-c1e0-11ea-8e78-082d6bb62184.png">