How to access iOS accelerometer in Delphi XE2?

How do I access the accelerometer in iOS using Delphi XE2?

I 开发者_运维百科tried looking through the IDE but did not find a component.

---

Delphi XE2 supports deploying to OSX on a mac. Deploying to an iPhone is apparently pretty easy, but it still involves using XCode as a final deployment tool. Since Delphi doesn't "officially" support deploying to iPhone hardware, I doubt they have included any components that are specific to it.

Disclaimer: I just downloaded XE2 a few hours ago, and I've only deployed one mac application so far (and it worked beautifully). So I'm far from an expert.

Edit: Anders Ohlsson has apparently written an accelerometer component for XE2. I have not tried it, but here it is.

---

Joseph is correct. Philip Hess has been contributing to the Delphi iOS newsgroups, and other useful information, eg:

https://forums.embarcadero.com/message.jspa?messageID=390713&tstart=125

He also has this page, here:

http://web.me.com/macpgmr/ObjP/Xcode4/ObjP_Intro.html

Which may be helpful to you. I'm currently wading through it all in order to use the CoreLocation services (amongst others). It's definitely not for the faint of heart.

---

There's a component that reads the accelerometer on the Embarcadero blog:
http://edn.embarcadero.com/article/41748
Here's the download link for the component: http://cc.embarcadero.com/item/28609

And here's the source code by Anders Ohlsson:
(I used this to build a component for the GPS/Compass).

unit Accelerometer;

{$IFDEF FPC}
{$mode objfpc}{$H+}
{$modeswitch objectivec1}
{$ENDIF}

interface

uses
  SysUtils, Classes, FMX_Types
{$IFDEF FPC}
  , iPhoneAll
{$ENDIF}
  ;

type
  TAccelerateEvent = procedure(x,y : Double) of object;

  TiOSAccelerometer = class(TFmxObject)
  private
    FOnAccelerate: TAccelerateEvent;
    { Private declarations }
  protected
    { Protected declarations }
  public
    { Public declarations }
    constructor Create(AOwner: TComponent); override;
  published
    { Published declarations }
    property OnAccelerate: TAccelerateEvent read FOnAccelerate write FOnAccelerate;
  end;

{$IFDEF FPC}
const
  kAccelerometerFrequency = 100.0; // Hz
{$ENDIF}

{$IFDEF FPC}
type
  UIAcceleration = objcclass external (NSObject)
  public
    function timestamp: NSTimeInterval; message 'timestamp';
    function x: UIAccelerationValue; message 'x';
    function y: UIAccelerationValue; message 'y';
    function z: UIAccelerationValue; message 'z';
  end;
{$ENDIF}

{$IFDEF FPC}
type
  AccDelegate = objcclass(NSObject)
    procedure accelerometer_didAccelerate(accelerometer: UIAccelerometer; acceleration: UIAcceleration); message 'accelerometer:didAccelerate:';
  end;
{$ENDIF}

{$IFDEF FPC}
var
  AccDelegatVar: AccDelegate;
{$ENDIF}

var
  MyAccelerometer: TiOSAccelerometer;

procedure Register;

implementation

{$IFDEF FPC}
procedure AccDelegate.accelerometer_didAccelerate(accelerometer: UIAccelerometer; acceleration: UIAcceleration);
begin
  if Assigned(MyAccelerometer) then
    if Assigned(MyAccelerometer.FOnAccelerate) then
      MyAccelerometer.FOnAccelerate(acceleration.x,acceleration.y);
end;
{$ENDIF}

constructor TiOSAccelerometer.Create(AOwner: TComponent);
begin
  inherited;
  {$IFDEF FPC}
  UIAccelerometer.sharedAccelerometer.setUpdateInterval(1.0 / kAccelerometerFrequency);
  AccDelegatVar := AccDelegate.alloc;
  UIAccelerometer.sharedAccelerometer.setDelegate(AccDelegatVar);
  {$ENDIF}
end;

procedure Register;
begin
  RegisterComponents('iOS', [TiOSAccelerometer]);
end;

end.