IPhone Application With 2 Windows

Question

I am trying to create an iPhone application with 2 windows. However - I do know how to exactly. Does anyone know where to find a tutorial or example?
My other window created is always null.

Answer 1

To make the following example, start a new project with the Window-based App Template and name it TwoWin:
// TwoWinAppDelegate.h
@interface TwoWinAppDelegate : NSObject <UIApplicationDelegate> {
UIWindow *window;
UIWindow *window2;
@property (nonatomic, retain) IBOutlet UIWindow *window;
@property (nonatomic, retain) IBOutlet UIWindow *window2;
- (IBAction)switchWindow;
@end
// TwoWinAppDelegate.m
#import "TwoWinAppDelegate.h"
@implementation TwoWinAppDelegate
@synthesize window;
@synthesize window2;
- (IBAction)switchWindow {
NSLog(@"%s:
window=%@
window2=%@", _func_, window, window2);
if (window.keyWindow) {
[window2 makeKeyAndVisible];
window.hidden = YES;
window2.hidden = NO;
else {
[window makeKeyAndVisible];
window.hidden = NO;
window2.hidden = YES;
NSLog(@" window.keyWindow=%d window2.keyWindow=%d",
window.keyWindow, window2.keyWindow);
- (void)applicationDidFinishLaunching:(UIApplication *)application {
[window makeKeyAndVisible];
window2.hidden = YES;
- (void)dealloc {
[window2 release];
[window release];
[super dealloc];
@end
MainWindow.xib looks like this (when the "View Mode" is in the Center position so a two column table is displayed with the view hierarchy as a tree of small icons to the left):
File's Owner -- UIApplication
First Responder -- UIResponder
Two Win App Delegate -- TwoWinAppDelegate
Window -- UIWindow
......View -- UIView
............Rounded Rect Button (Switch1) -- UIButton
Window2 -- UIWindow
......View2 -- UIView
............Rounded Rect Button (Switch2) -- UIButton
The XIB connections:
File's Owner:
......'delegate' outlet to App Delegate
App Delegate:
......'window' outlet to Window
......'window2' outlet to Window2
Rounded Rect Button (Switch1):
......'Touch Up Inside' to App Delegate: switchWindow
Rounded Rect Button (Switch2):
......'Touch Up Inside' to App Delegate: switchWindow
The View1 and View2 frames are manually set to full-screen less status bar since no view controllers are used in this example. E.g., for iPhone, set these frames to (0, 20, 320, 460) in the Size Inspector. It's also helpful to set View1 and View2 to different background colors in the Attributes Inspector.
- Ray