vb.net print barcode labels Responding to device rotation Device in landscape mode in Objective-C

Generate QR-Code in Objective-C Responding to device rotation Device in landscape mode

Listing 7.9 Responding to device rotation Device in landscape mode
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(BOOL)shouldAutorotateToInterfaceOrientation: (UIInterfaceOrientation)interfaceOrientation {
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if(interfaceOrientation == UIInterfaceOrientationLandscapeLeft || interfaceOrientation == UIInterfaceOrientationLandscapeRight) { self.webView.frame = CGRectMake(
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Creating advanced view controllers
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self.webView.frame.origin.x, webView.frame.origin.y, 662, 662); } else { self.webView.frame = CGRectMake( self.webView.frame.origin.x, self.webView.frame.origin.y, 728, 911); } return YES; }
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Updates frame of web view for landscape mode
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Updates frame of web view for portrait mode
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You first determine whether the device is being held in landscape mode B. If so, you adjust the frame accordingly C. Note that the numbers used to update the frame are picked based on personal preference you should adjust the frame to what you feel looks correct for the given orientation. Then, you update the frame of the WebView to look correct in portrait mode D. So far, you ve explored the view controllers that you might use as the building blocks of your own views. Tab bars, navigators, flipsides, and split views are ultimately tools that you ll use to construct other sorts of programs. But a couple types of view controllers exist to accomplish very specific tasks: the modal view controller and the popover view controller.
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Technically, a modal view refers to a temporary view that s placed on top of all the elements of an existing view and then later dismissed. A modal view controller is a view controller that manages such a modal view. The iPhone camera is an example of a view controller that has been presented modally. The popover view is a very lightweight view intended to display data in a specific area. In contrast to a modal view, the popover view doesn t consume the entire screen; rather, it s displayed as a context menu. In the previous example, the split view controller project template gave you a popover view for free when the device was in portrait mode.
Creating a popover view controller
A popover view controller is initialized with the view controller containing the view to be displayed inside it. Figure 7.14 shows what this looks like in the previous example when the device is held in portrait mode.
A popover view
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Popover and modal view controllers
As you can see, it contains the data that is normally displayed in the table view on the left side of the split view. This list is displayed when the user presses the Root List button. Let s look at the code for displaying a popover view when a button is pressed, shown in listing 7.10. This code is taken from Apple s example of working with popover view controllers.
Listing 7.10 Displaying a popover view when a button is pressed
- (IBAction) buttonPressed:(id) sender { MyCustomViewController* content = [[MyCustomViewController alloc] init]; UIPopoverController* aPopover = [[UIPopoverController alloc] initWithContentViewController:content]; aPopover.delegate = self; [content release]; self.popoverController = aPopover; [aPopover release]; [self.popoverController presentPopoverFromBarButtonItem:sender permittedArrowDirections:UIPopoverArrowDirectionAny animated:YES]; }
The pattern that this code follows should be fairly familiar to you. It s similar to the code that handles a touch on a UITableView row. You first initialize the new view controller to display in; this controller is then used to initialize the popover. You basically tell the popover to display the view contents of the view controller it was initialized with. Finally, you display the popover view near the button the user tapped. Fortunately, UIKit automatically handles the placing of the popover view for you. In addition, it allows you to configure the direction the arrow is pointing in giving your popover some sort of context.
Creating a modal view controller
Practically, the modal views available in the iPhone OS are all helper programs. They let you start up a complex graphical interface that s been preprogrammed by Apple while only managing the responses. You get the advantage of lots of programming (and a standardized interface), and you don t have to do much yourself. Whenever you want to display a modal view, you use the UIViewController s presentModalViewController:animated: method to start it up:
[self presentModalViewController:myPicker animated:YES];
Later, you dismiss it using another UIViewController method:
[self dismissModalViewControllerAnimated::YES];
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