高度の計測

※iPhone6以上の端末でないと動作しません

Swift 5.x

//
//  ViewController.swift
//  coremotion004
//

import UIKit
import CoreMotion

class ViewController: UIViewController {

    var myCMAltimeter: CMAltimeter!
    var myAltimeter: UITextField!

    override func viewDidLoad() {
        super.viewDidLoad()

        // CMAltimeterを取得.
        myCMAltimeter = CMAltimeter()

        // CMAltimeterが利用できるか(iPhone5SではNoが返ってくる).
        let isAltimeter = CMAltimeter.isRelativeAltitudeAvailable()

        // UITextFieldを作成.
        myAltimeter = UITextField(frame: CGRect(x: 0, y: 0, width: 200, height: 30))

        // 枠の線を表示.
        myAltimeter.borderStyle = UITextField.BorderStyle.roundedRect

        // UITextFieldの表示する位置.
        myAltimeter.layer.position = CGPoint(x:self.view.bounds.width/2,y:100)

        // Viewに追加.
        self.view.addSubview(myAltimeter)

        // Altimeterのモニタリングのスタート.
        if !isAltimeter {
            print("not use altimeter")
            return
        }
        myCMAltimeter.startRelativeAltitudeUpdates(to: OperationQueue.main, withHandler: {(altimeterData, error) in
            if let e = error {
                print(e.localizedDescription)
            }
            guard let data = altimeterData else {
                return
            }
            self.myAltimeter.text = "Altitude: \(data.relativeAltitude)"
        })
    }
}

Swift 4.x/Swift 3.x

//
//  ViewController.swift
//  coremotion004
//
//  Created by akimach on 2016/08/24.
//  Copyright © 2016年 akimacho. All rights reserved.
//

import UIKit
import CoreMotion

class ViewController: UIViewController {

    var myCMAltimeter: CMAltimeter!
    var myAltimeter: UITextField!

    override func viewDidLoad() {
        super.viewDidLoad()

        // CMAltimeterを取得.
        myCMAltimeter = CMAltimeter()

        // CMAltimeterが利用できるか(iPhone5SではNoが返ってくる).
        let isAltimeter = CMAltimeter.isRelativeAltitudeAvailable()

        // UITextFieldを作成.
        myAltimeter = UITextField(frame: CGRect(x: 0, y: 0, width: 200, height: 30))

        // 枠の線を表示.
        myAltimeter.borderStyle = UITextBorderStyle.roundedRect

        // UITextFieldの表示する位置.
        myAltimeter.layer.position = CGPoint(x:self.view.bounds.width/2,y:100)

        // Viewに追加.
        self.view.addSubview(myAltimeter)

        // Altimeterのモニタリングのスタート.
        if !isAltimeter {
            print("not use altimeter")
            return
        }
        myCMAltimeter.startRelativeAltitudeUpdates(to: OperationQueue.main, withHandler: {(altimeterData, error) in
            if let e = error {
                print(e.localizedDescription)
            }
            guard let data = altimeterData else {
                return
            }
            self.myAltimeter.text = "Altitude: \(data.relativeAltitude)"
        })
    }
}

Swift 2.3

//
//  ViewController.swift
//  coremotion004
//
//  Created by akimach on 2016/08/24.
//  Copyright © 2016年 akimacho. All rights reserved.
//

import UIKit
import CoreMotion

class ViewController: UIViewController {

    var myCMAltimeter: CMAltimeter!
    var myAltimeter: UITextField!

    override func viewDidLoad() {
        super.viewDidLoad()

        // CMAltimeterを取得.
        myCMAltimeter = CMAltimeter()

        // CMAltimeterが利用できるか(iPhone5SではNoが返ってくる).
        let isAltimeter = CMAltimeter.isRelativeAltitudeAvailable()

        // UITextFieldを作成.
        myAltimeter = UITextField(frame: CGRectMake(0,0,200,30))

        // 枠の線を表示.
        myAltimeter.borderStyle = UITextBorderStyle.RoundedRect

        // UITextFieldの表示する位置.
        myAltimeter.layer.position = CGPoint(x:self.view.bounds.width/2,y:100)

        // Viewに追加.
        self.view.addSubview(myAltimeter)

        // Altimeterのモニタリングのスタート.
        if !isAltimeter {
            print("not use altimeter")
            return
        }
        myCMAltimeter.startRelativeAltitudeUpdatesToQueue(NSOperationQueue.mainQueue(), withHandler: {(altimeterData, error) in
            if let e = error {
                print(e.localizedDescription)
            }
            guard let data = altimeterData else {
                return
            }
            self.myAltimeter.text = "Altitude: \(data.relativeAltitude)"
        })
    }
}

4.xと5.xの差分

• UITextBorderStyle を UITextField.BorderStyle に変更

2.3と3.0の差分

• CGRectMake(CGFloat, CGFloat, CGFloat, CGFloat)からCGRect(x: CGFloat, y: CGFloat, width: CGFloat, height: CGFloat)に変更
• UITextBorderStyle.RoundedRectからUITextBorderStyle.roundedRectに変更
• CMAltimeter.startRelativeAltitudeUpdatesToQueue(NSOperationQueue, withHandler: CMAltitudeHandler)からCMAltimeter.startRelativeAltitudeUpdates(to: OperationQueue, withHandler: CMAltitudeHandler)に変更
• NSOperationQueue.mainQueue()からOperationQueue.mainに変更

Reference

• CMAltimeter
  • https://developer.apple.com/reference/coremotion/cmaltimeter
• NSOperationQueue
  • https://developer.apple.com/library/mac/documentation/Cocoa/Reference/NSOperationQueue_class/
  • https://developer.apple.com/reference/foundation/nsoperationqueue