Xcode 8打开新的苹果地图

Question

需要一些帮助。这是我的代码，当我点击按钮GoMap时，我被提示此错误 致命错误：在解包可选值时意外发现nil

@IBAction func GoMap(_ sender: UIButton) {   
 UIApplication.shared.openURL(NSURL(string: "http://maps.apple.com/maps?saddr=1 Republic Boulevard , Singapore 038975")! as URL)

}

Answer 1

您的网址无效。空格需要转义为％20：

URL(string: "http://maps.apple.com/maps?saddr=1%20Republic%20Boulevard,%20Singapore%20038975")!

或者，使用URLComponent + URLQueryItem让系统为您转义：

var components = URLComponents(string: "http://maps.apple.com/maps")!
components.queryItems = [URLQueryItem(name: "saddr", value: "1 Republic Boulevard, Singapore 038975")]
let url = components.url!
UIApplication.shared.openURL(url)