Question

我需要在我正在构建的当前应用中显示当前的海拔高度。但是，确定海拔高度后，标签将显示为xxx.xxxxxxxxxxxx 它在小数点的另一侧超级远。我只希望它在小数点的另一侧最多给出2个数字。这怎么可能？

    manager.delegate = self
    manager.desiredAccuracy = kCLLocationAccuracyBest
    manager.requestWhenInUseAuthorization()
    manager.startUpdatingLocation()

     func locationManager(_ manager: CLLocationManager,            didUpdateLocations locations: [CLLocation]) {

    let location = locations [0]

    self.speedLabel.text = String(location.speed)


    self.altitudeLabel.text = String(location.altitude)
    CLGeocoder().reverseGeocodeLocation(location) { (placemarks, error) in

        if error != nil {
            print(error!)

        }

这是我目前的代码。

就像我说的那样，我只想将海拔高度显示为＆＃34; XX.XX＆＃34;而不是XX.XXXXXXXXX

Answer 1

试试这个：

SET SERVEROUTPUT ON

DECLARE

email_body CLOB;

BEGIN

email_body:=to_clob('Hel's Message');

DBMS_OUTPUT.PUT_LINE(length(email_body));

EXCEPTION
WHEN OTHERS THEN
DBMS_OUTPUT.PUt_LINE(SQLCODE||' '||SQLERRM);

END;

self.altitudeLabel.text = location.altitude.decimal（places：2）

Answer 2

试试吧：

self.altitudeLabel.text = String(format: "%.2f", location.altitude)

如何追加Altitude Integers

2 个答案: