How To Swap View In iPhone?

January 28, 2010 /
iOS /
By Rick /
2 COMMENTS

There is one way of handling autorotation, and it’s an option you’ll likely only use in the case of very complex interface. We just design the landscape and portrait views separately and then swap them out when the phone is rotated.

Step 1: Create a new project in Xcode using the view-based application.

Step 2: Double click .xib file to open the file in interface Builder. First single click View icon, and press delete botton. Next drag over two UIView from library . Single click the view to select it and change name one view Portrait and other Landscape. Now , control drag from File’s Owner to the Portrait icon and select portrait outlet. Then, control drag from File’s Owner a second time to the Landscape icon, and select Landscape outlet. Double click the icon called Landscape, and bring up size inspector. Change the view value 480 pixel wide and 300 pixels tall. Now drag two Round Rect Buttons over from the library to the Landscape view. Double click the left button, and give the title Foo, and then double click the right one , and give it a title of Bar. Control drag from the File’s Owner icon to the Foo button, and assign it to the landscapeFoo outlet, and then do the same thing to assign the Bar button to the landscapeBar outlet. Single click Foo button, and bring to connection inspector. Drag touch up inside to File’s Owner icon. (See figure 1)

Figure 1: Landscape View.

Step 3: We need to put the code in place to handle the swap and the button taps.

-(void)willAnimateFirstHalfOfRotationToInterfaceOrientation:
(UIInterfaceOrientation)toInterfaceOrientation
duration:(NSTimeInterval)duration
{
//UIInterfaceOrientation toOrientation = self.interfaceOrientation;

if(toOrientation == UIInterfaceOrientationPortrait)
{
self.view = self.portrait;
self.view.transform = CGAffineTransformIdentity;
self.view.transform =
CGAffineTransformMakeRotation(degreesToRadian(0));
self.view.bounds = CGRectMake(0.0, 0.0, 300.0, 480.0);
}

else if(toOrientation == UIInterfaceOrientationLandscapeLeft)
{
self.view = self.landscape;
self.view.transform = CGAffineTransformIdentity;
self.view.transform =
CGAffineTransformMakeRotation(degreesToRadian(-90));
self.view.bounds = CGRectMake(0.0, 0.0, 460.0, 320.0);
}

else if (toOrientation == UIInterfaceOrientationPortraitUpsideDown)
{
self.view = self.portrait;
self.view.transform = CGAffineTransformIdentity;
self.view.transform =
CGAffineTransformMakeRotation(degreesToRadian(180));
self.view.bounds = CGRectMake(0.0, 0.0, 300.0, 480.0);
}

else if(toOrientation == UIInterfaceOrientationLandscapeRight)
{
self.view = self.landscape;
self.view.transform = CGAffineTransformIdentity;
self.view.transform =
CGAffineTransformMakeRotation(degreesToRadian(90));
self.view.bounds = CGRectMake(0.0, 0.0, 460.0, 320.0);
}

}

-(void)willAnimateFirstHalfOfRotationToInterfaceOrientation:

(UIInterfaceOrientation)toInterfaceOrientation

duration:(NSTimeInterval)duration

{

//UIInterfaceOrientation toOrientation = self.interfaceOrientation;

if(toOrientation == UIInterfaceOrientationPortrait)

{

self.view = self.portrait;

self.view.transform = CGAffineTransformIdentity;

self.view.transform =

CGAffineTransformMakeRotation(degreesToRadian(0));

self.view.bounds = CGRectMake(0.0, 0.0, 300.0, 480.0);

}

else if(toOrientation == UIInterfaceOrientationLandscapeLeft)

{

self.view = self.landscape;

self.view.transform = CGAffineTransformIdentity;

self.view.transform =

CGAffineTransformMakeRotation(degreesToRadian(-90));

self.view.bounds = CGRectMake(0.0, 0.0, 460.0, 320.0);

}

else if (toOrientation == UIInterfaceOrientationPortraitUpsideDown)

{

self.view = self.portrait;

self.view.transform = CGAffineTransformIdentity;

self.view.transform =

CGAffineTransformMakeRotation(degreesToRadian(180));

self.view.bounds = CGRectMake(0.0, 0.0, 300.0, 480.0);

}

else if(toOrientation == UIInterfaceOrientationLandscapeRight)

{

self.view = self.landscape;

self.view.transform = CGAffineTransformIdentity;

self.view.transform =

CGAffineTransformMakeRotation(degreesToRadian(90));

self.view.bounds = CGRectMake(0.0, 0.0, 460.0, 320.0);

}

Step 4: The core graphics framework is not included in our Xcode project. We have to manually link that framework into our project. The iPhone OS frameworks can be found here :
/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS2.0.sdk/System/Library/Frameworks

Step 5: Now compile and rum it on the simulator.(See figure 2)

Figure 2: Portrait View.

How To Swap View In iPhone?

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