Swift -如何在iOS中更新标签的相对高度更改

Question

我已经设法让这打印的相对高度数据到日志，但我想做的是让它打印到指定的label.Any帮助将不胜感激。

import UIKit
import CoreMotion

class ViewController: UIViewController {


    @IBOutlet weak var altitudeLabel: UILabel!
    let altimeter = CMAltimeter()

    override func viewDidLoad() {
        super.viewDidLoad()
        // Do any additional setup after loading the view, typically from a nib.
    }

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }

    @IBAction func start(sender: AnyObject) {

        if CMAltimeter.isRelativeAltitudeAvailable() {
            altimeter.startRelativeAltitudeUpdatesToQueue(NSOperationQueue.mainQueue(), withHandler: { data, error in
                if (error == nil) {
                    println("relative Altitude: \(data.relativeAltitude)")
                    println("Pressure: \(data.pressure)")

                }
        })

    }

}

}

Answer 1

您可以使用以下行为UILabel插座分配一个带两位小数点的浮点值：

self.altitudeLabel.text = String(format: "%0.2f", data.relativeAltitude)

Answer 2

我最终使用了这个，它将在现在到期：

     var myIntValue:Int = Int(data.relativeAltitude)
                println ("My value is \(myIntValue)")
                self.altitudeLabel.text = ("\(myIntValue) M")