.net barcode sdk free An alert with two buttons in Objective-C

Printer QR-Code in Objective-C An alert with two buttons

An alert with two buttons
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iPhone SDK Programming: A Beginner s Guide
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UIActionSheet and UIActionSheetDelegate
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While an alert displays as a pop-up box, the UIActionSheet slides in from a view s bottom, a view s toolbar, or a view s tab bar You set where a toolbar slides in from when you display the action sheet For instance, the following code slides the action sheet from the view s bottom
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[myActionSheet showInView:selfview];
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The action sheet s bottom is aligned with the view s bottom Note that if you use this setting when using a tab bar or toolbar, the action sheet s bottom is hidden by the bar To prevent this, you display the action sheet using the showFromTabBar: or showFromToolBar: method For instance, the following code slides the action sheet from the tab bar s top and aligns the action sheet s bottom with the bottom of the tab bar
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[myActionSheet showFromTabBar:selfview];
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UIActionSheets are otherwise very similar to UIAlertViews You specify an action sheet s delegate by creating a class adopting the UIActionSheetDelegate You use this delegate to implement button actions Methods are similar to UIAlertViewDelegate s For instance, the following code handles a button click
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- (void)actionSheet:(UIActionSheet *)actionSheet clickedButtonAtIndex: (NSInteger) buttonIndex
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Using a UIActionSheet
1 Open AlertsProgress in Xcode 2 Open AlertsProgressViewControllerh and change the class so it adopts the
UIActionSheetDelegate protocol (Listing 11-10)
3 Add an IBAction called removeAll In the method s implementation, add a UIActionSheet
that asks the user for confirmation (Listing 11-11) Remove the viewDidLoad method
4 Open AlertsProgressViewControllerxib in Interface Builder, add a button to the view, and
connect the removeAll action in the File s Owner to the button s Touch Up Inside event (Figure 11-18) Save and exit Interface Builder
5 Open AlertsProgressViewControllerm and implement the didDismissWithButtonIndex:
method (Listing 11-11)
6 Click Build And Go to run the application (Figure 11-19) Click each button in the action
sheet, and the debugger console should produce logging results similar to Listing 11-12
11:
Activity Progress and Alerting Users
Figure 11-18
Connecting File s Owner removeAll action to a button AlertsProgressViewControllerh
Listing 11-10
#import <UIKit/UIKith> @interface AlertsProgressViewController : UIViewController <UIActionSheetDelegate> { } - (IBAction) removeAll: (id) sender; @end
Listing 11-11
AlertsProgressViewControllerm
#import "AlertsProgressViewControllerh" @implementation AlertsProgressViewController - (IBAction) removeAll: (id) sender { UIActionSheet * myActionSheet = [[[UIActionSheet alloc] initWithTitle: @"Remove all " delegate:self cancelButtonTitle:@"No" destructiveButtonTitle: @"Yes" otherButtonTitles:@"Not Sure",nil] autorelease];
(continued)
iPhone SDK Programming: A Beginner s Guide
[myActionSheet showInView:selfview]; } - (void) actionSheet: (UIActionSheet *) actionSheet didDismissWithButton Index: (NSInteger) buttonIndex { NSLog(@"buttons index: %i", buttonIndex); if(buttonIndex == [actionSheet cancelButtonIndex]) { NSLog(@"cancelled"); } } -(void)dealloc { [super dealloc]; } @end
Listing 11-12
Debugger console output
[Session started at 2009-01-17 10:00:55 -0500] 2009-01-17 10:00:59432 AlertsProgress[861:20b] buttons index: 0 2009-01-17 10:01:01936 AlertsProgress[861:20b] buttons index: 1 2009-01-17 10:01:04336 AlertsProgress[861:20b] buttons index: 2
Figure 11-19
A UIActionSheet in action
11:
Activity Progress and Alerting Users
Figure 11-20
An application badge tells me I have 39 e-mails in my inbox
Application Badges
The iPhone s Mail application illustrates using a badge For instance, in Figure 11-20, I have 39 e-mails in my inbox Using this functionality is easy Simply access your application s applicationBadgeNumber property and set it A user s iPhone will remember the value between uses of your program To clear a badge, simply set its value to zero
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Adding an Application Badge
1 Open the previous task in Xcode 2 Modify the didDismissWithButtonIndex method to match Listing 11-13 3 Click Build And Go to run the application 4 Click the Yes button four or five times Quit the application, but keep the simulator
running The application s icon is adorned with an application badge (Figure 11-21)
5 Start the application again; click the No button a few times Quit the application, but
keep the simulator running and notice the application s badge was decremented
(continued)
iPhone SDK Programming: A Beginner s Guide
Figure 11-21
The application has an application badge
Listing 11-13 badge
The didDismissWithButtonIndex method modified to use an application
- (void) actionSheet: (UIActionSheet *) actionSheet didDismissWith ButtonIndex: (NSInteger) buttonIndex { if(buttonIndex == [actionSheet cancelButtonIndex]) [UIApplication sharedApplication]applicationIconBadgeNumber = [UIApplication sharedApplication]applicationIconBadgeNumber - 1; else if (buttonIndex == [actionSheet destructiveButtonIndex]) [UIApplication sharedApplication]applicationIconBadgeNumber = [UIApplication sharedApplication]applicationIconBadgeNumber + 1; }
11:
Activity Progress and Alerting Users
Summary
In this chapter you learned techniques for alerting users Tasks that take time to complete should provide feedback to a user When an application can estimate how long a task will take to complete, provide a UIProgressView When an application cannot estimate how long a task will take to complete, provide a UIActivityView When an unusual situation arises that requires a user decision, present a UIAlertView When a user is making a decision that is potentially destructive, present a UIAlertView or a UIActionSheet, depending upon the uniqueness of the situation If the situation is something commonly occurring while using an application, use a UIActionSheet If it is an unusual situation, use a UIAlertView But be careful not to overuse these two controls, as they interrupt an application s flow This chapter ended by presenting application badges Application badges are useful to alert a user of unprocessed items or items needing a user s attention Application badges are easy to incorporate into your application, but, like alerts and action sheets, should not be misused You should not use an application badge to tell a user how many notes he or she has written in the Notes application These notes do not require some action Informing a user how many e-mails are in his or her inbox is an appropriate application badge use Use your best judgment
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