1 unit Unit2;
 2 
 3 interface
 4 
 5 uses
 6   System.SysUtils, System.Types, System.UITypes, System.Classes, System.Variants,
 7   FMX.Types, FMX.Controls, FMX.Forms, FMX.Graphics, FMX.Dialogs, FMXTee.Engine,
 8   FMXTee.Procs, FMXTee.Chart, FMX.Layouts, FMX.Controls.Presentation,
 9   FMX.StdCtrls;
10 
11 type
12   TForm2 = class(TForm)
13     Layout1: TLayout;
14     Chart1: TChart;
15     Layout2: TLayout;
16     Button1: TButton;
17     Button2: TButton;
18     Button3: TButton;
19     Button4: TButton;
20     Button5: TButton;
21     procedure Button1Click(Sender: TObject);
22     procedure Button5Click(Sender: TObject);
23     procedure Button2Click(Sender: TObject);
24     procedure Button3Click(Sender: TObject);
25     procedure Button4Click(Sender: TObject);
26   private
27     { Private declarations }
28   public
29     { Public declarations }
30   end;
31 
32 var
33   Form2: TForm2;
34 
35 implementation
36 uses
37   FMX.Platform; //需要引入
38 {$R *.fmx}
39 {$R *.LgXhdpiPh.fmx ANDROID}
40 
41 procedure APPSetScreenOrientation(ADirection: TScreenOrientation);
42 var
43   ScreenService: IFMXScreenService;
44   OrientSet: TScreenOrientations;
45 begin
46   if TPlatformServices.Current.SupportsPlatformService(IFMXScreenService, IInterface(ScreenService))
47   then
48   begin
49     //Portrait 竖向,纵向
50     //Landscape 横向
51     //InvertedPortrait 倒转竖向,纵向
52     //InvertedLandscape 倒转横向
53     OrientSet := [ADirection];
54     ScreenService.SetScreenOrientation(OrientSet);
55   end;
56 end;
57 
58 procedure TForm2.Button1Click(Sender: TObject);
59 begin
60   APPSetScreenOrientation(TScreenOrientation.Portrait);
61 end;
62 
63 procedure TForm2.Button2Click(Sender: TObject);
64 begin
65   APPSetScreenOrientation(TScreenOrientation.Landscape);
66 end;
67 
68 procedure TForm2.Button3Click(Sender: TObject);
69 begin
70   APPSetScreenOrientation(TScreenOrientation.InvertedPortrait);
71 end;
72 
73 procedure TForm2.Button4Click(Sender: TObject);
74 begin
75   APPSetScreenOrientation(TScreenOrientation.InvertedLandscape);
76 end;
77 
78 procedure TForm2.Button5Click(Sender: TObject);
79 var
80   ScreenService: IFMXScreenService;
81 begin
82   if TPlatformServices.Current.SupportsPlatformService(IFMXScreenService, IInterface(ScreenService))
83   then
84   begin
85     case ScreenService.GetScreenOrientation of
86       TScreenOrientation.Portrait: ShowMessage('Portrait');
87       TScreenOrientation.Landscape: ShowMessage('landscape');
88       TScreenOrientation.InvertedPortrait: ShowMessage('Inverted-Portrait');
89       TScreenOrientation.InvertedLandscape: ShowMessage('Inverted-Landscape');
90       else ShowMessage('not set');
91     end;
92   end;
93 end;
94 
95 end.

 1 Uses: iOSapi.UIKit; 
 2 
 3 procedure ChangeiOSorientation(toOrientation: UIInterfaceOrientation;
 4 possibleOrientations: TScreenOrientations);
 5 var
 6     win : UIWindow;
 7     App : UIApplication;
 8     viewController : UIViewController;
 9     oucon: UIViewController;
10 begin
11     Application.FormFactor.Orientations := []; //Change supported orientations
12     App := TUIApplication.Wrap(TUIApplication.OCClass.sharedApplication);
13     win := TUIWindow.Wrap(App.windows.objectAtIndex(0)); //The first Windows is always the main Window
14 
15     App.setStatusBarOrientation(toOrientation);
16     {After you have changed your statusbar orientation set the
17     Supported orientation/orientations to whatever you need}
18     Application.FormFactor.Orientations := possibleOrientations;
19     viewController := TUIViewController.Wrap(TUIViewController.alloc.init);//dummy ViewController
20     oucon := TUIViewController.Wrap(TUIViewController.alloc.init);
21     {Now we are creating a new Viewcontroller now when it is created
22      it will have to check what is the supported orientations}
23     oucon := win.rootViewController;//we store all our current content to the new ViewController
24     Win.setRootViewController(viewController);
25     Win.makeKeyAndVisible;// We display the Dummy viewcontroller
26 
27     win.setRootViewController(oucon);
28     win.makeKeyAndVisible; 
29     {And now we Display our original Content in a new Viewcontroller 
30      with our new Supported orientations} 
31 end;

1  ChangeiOSorientation(UIInterfaceOrientationPortrait,[TScreenOrientation.Portrait,TScreenOrientation.Landscape,TScreenOrientation.InvertedLandscape]);