.net barcode sdk free creates an associated xib named PleaseWaitViewController in Objective-C

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creates an associated xib named PleaseWaitViewController
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3 Add an IBOutlet for a UIProgressView to PleaseWaitViewController (Listings 11-3
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and 11-4)
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4 Drag starcopypng from the book s Resources folder to the Resources folder in Xcode 5 Build and then open PleaseWaitViewControllerxib in Interface Builder 6 Add an image view from the library to the view s canvas Select starcopypng as the image
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Figure 11-8 PleaseWaitViewController s view in Interface Builder
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7 Add a label and a progress view from the library to the view s canvas (Figure 11-8) 8 Connect the UIProgressView on the canvas to the myProgress outlet in PleaseWaitView
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9 Save and exit Interface Builder 10 Open ActivityAndProgressControllerh, and import the PleaseWaitViewController and the
application s delegate
11 Add an IBOutlet for a PleaseWaitViewController Add a method called moveBar
Listing 11-5 contains the completed ActivityAndProgressControllerh
12 Open ActivityAndProgressControllerm and implement the methods to match Listing 11-6
Note that doIt has changed from the previous task
13 Open ActivityAndProgressControllerxib in Interface Builder and add several controls
(Figure 11-9) The selection is not important, as they are not used
14 Add a view controller from the library to the document window Change the controller s
class to PleaseWaitViewController Also, change the controller s NIB name to PleaseWait ViewController
11:
Activity Progress and Alerting Users
Figure 11-9 ActivityAndProgressViewController s canvas
15 Connect the File s Owner myActivityView outlet to the newly added controller 16 Save and exit Interface Builder 17 Click Build And Go After the application loads in iPhone Simulator (Figure 11-10),
click the button The PleaseWaitViewController s view is displayed and the progress view updates (Figure 11-11) Upon completion, the application removes the view and displays the original view once again Listing 11-3 PleaseWaitViewControllerh
#import <UIKit/UIKith> @interface PleaseWaitViewController : UIViewController { IBOutlet UIProgressView * myProgress; } @property (nonatomic, retain) IBOutlet UIProgressView * myProgress; @end
(continued)
iPhone SDK Programming: A Beginner s Guide
Figure 11-10
The application running in iPhone Simulator
Figure 11-11
The application displaying the UIProgressView you added to the project
11:
Activity Progress and Alerting Users
Listing 11-4
PleaseWaitViewControllerm
#import "PleaseWaitViewControllerh" @implementation PleaseWaitViewController @synthesize myProgress; - (void)dealloc { [myProgress release]; [super dealloc]; } @end
Listing 11-5
ActivityAndProgressViewControllerh modified for this task
#import <UIKit/UIKith> #import "PleaseWaitViewControllerh" #import "ActivityAndProgressAppDelegateh" @interface ActivityAndProgressViewController : UIViewController { IBOutlet PleaseWaitViewController * myActivityView; } @property (nonatomic, retain) IBOutlet PleaseWaitViewController * myActivityView; - (void) moveBar: (id) object; - (IBAction) doIt: (id) sender; @end
Listing 11-6
ActivityAndProgressViewControllerm modified for this task
#import "ActivityAndProgressViewControllerh" @implementation ActivityAndProgressViewController @synthesize myActivityView; int completed = 0; - (void) moveBar: (id) object { completed ++; myActivityViewmyProgressprogress = completed/200f; if(completed > 20) { [object invalidate]; [selfmyActivityViewview removeFromSuperview]; [selfview setAlpha:10f]; completed = 0; selfmyActivityViewmyProgressprogress = 0; } }
(continued)
iPhone SDK Programming: A Beginner s Guide
- (IBAction) doIt: (id) sender { myActivityViewviewbackgroundColor = [UIColor clearColor]; [selfview setAlpha:07f]; [((ActivityAndProgressAppDelegate *)[UIApplication sharedApplication]delegate)window insertSubview:myActivityViewview aboveSubview: selfview]; [NSTimer scheduledTimerWithTimeInterval: 05 target: self selector: @selector(moveBar:) userInfo: nil repeats: YES]; } - (void)dealloc { [myActivityView release]; [super dealloc]; } @end
This task is pretty cool You first created a separate view controller and view to contain the UIProgressView Not happy with just a normal view, you added an image and placed the controls over the image Later, when setting the view s background color to clear, this created the impression of a non-rectangular view (see Figure 11-8)
Ask the Expert
Q: A:
So you create a non-rectangular view by using a UIImageView on a clear view Yes, this is one technique A more robust technique is drawing the user interface yourself, but drawing a user interface from scratch is hard Using a UIImageView on a view with a clear background is easy Make your application s window clear, the views clear, and then place any controls so that they overlay the image For instance, Figure 11-12 illustrates a simple non-rectangular view
You also added a UIProgressView to the PleaseWaitViewController (Listing 11-3) as an outlet You then added a PleaseWaitViewController (Listing 11-5) as an outlet This allows you to reference both the PleaseWaitViewController and its UIProgressView from code in Activity AndProgressViewController In ActivityAndProgressViewController, you created a method called moveBar and modified the doIt method The doIt method is called when a user clicks the button on the ActivityAndProgressViewController The method first sets its myActivity view s background color to clear, making the view transparent
myActivityViewviewbackgroundColor = [UIColor clearColor];
11:
Activity Progress and Alerting Users
Figure 11-12
A simple non-rectangular view
The method then sets the view s alpha level, giving it a faded, semi-transparent appearance
[selfview setAlpha:07f];
The doIt method also then gets a reference to the application s window and adds myActivity s view above the ActivityAndProgressViewController s view
[((ActivityAndProgressAppDelegate *)[UIApplication sharedApplication] delegate)window insertSubview: myActivityViewview aboveSubview: selfview];
To simulate a long-standing task, you use an NSTimer, which every half a second calls ActivityAndProgressViewController s moveBar method
[NSTimer scheduledTimerWithTimeInterval: 05 target: @selector(moveBar:) userInfo: nil repeats: YES]; self selector:
The moveBar method updates the progress bar until it reaches 20 It then invalidates the timer, removes PleaseWaitViewController s view, and sets the original view s alpha back to full strength It also reinitializes the UIProgressView s progress value to zero
[NSTimer scheduledTimerWithTimeInterval: 05 target: self selector: @selector(moveBar:) userInfo: nil repeats: YES];
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