iPhone SDK 4 is now available to ALL registered Apple Develoers

iOS 4 is the next generation of the world's most innovative mobile operating system. Its unique capabilities and new technologies will change what's possible on a mobile platform.

iPhone SDK 4

With a rich set of over 1500 new APIs, iPhone SDK for iOS 4 provides you with an amazing range of technologies to enhance the functionality of your iPhone and iPod touch apps. Registered Apple developers can visit the iPhone Dev Center to download the iPhone SDK 4 now.

Apple Event - WWDC 10 - iPhone 4

Apple CEO, Steve Jobs introduces iPhone 4 at the company's World Wide Developers Conference in San Francisco. Features include a new glass and steel design, a built in antenna and a higher resolution screen.

Apple iPhone 4 Intro.

iPhone SDK 4 beta

With a rich set of over 1500 new APIs, iPhone SDK for iPhone OS 4 provides you with an amazing range of technologies to enhance the functionality of your iPhone and iPod touch apps. iPhone Developer Program members can visit the iPhone Dev Center to download the iPhone SDK 4 beta now.

iPhone SDK 4 beta is available for download to members of the iPhone Developer Program.

Apple iPhone OS 4.0 : Multitasking

Apple iPhone OS 4.0 : Multitasking Part 1


Apple iPhone OS 4.0 : Multitasking Part 2


iPhone OS 4 delivers seven new multitasking services that allow your apps to perform tasks in the background while preserving battery life and performance. These multitasking services include: * Background audio - Allows your app to play audio continuously. So customers can listen to your app while they surf the web, play games, and more. * Voice over IP - Your VoIP apps can now be even better. Users can now receive VoIP calls and have conversations while using another app. Your users can even receive calls when their phones are locked in their pocket. * Background location - Navigation apps can now continue to guide users who are listening to their iPods, or using other apps. iPhone OS 4 also provides a new and battery efficient way to monitor location when users move between cell towers. This is a great way for your social networking apps to keep track of users and their friends' locations. * Push notifications - Receive alerts from your remote servers even when your app isn't running. * Local notifications - Your app can now alert users of scheduled events and alarms in the background, no servers required. * Task finishing - If your app is in mid-task when your customer leaves it, the app can now keep running to finish the task. * Fast app switching - All developers should take advantage of this. This will allow users to leave your app and come right back to where they were when they left - no more having to reload the app.

Apple iPhone OS 4.0 Unvieling at Apple Special Event, April 2010 : Introduction

Apple has unveiled plans for the biggest and most exciting iPhone software update yet. iPhone OS 4 will include over 100 new user features for iPhone and iPod touch owners to enjoy. And for developers, a new software development kit (SDK) offers over 1500 new APIs to create apps that are even more powerful, innovative, and amazing.

Load background image of Button using programing code

There is a method called viewDidLoad in the controller's super class. It will be called after our view loaded. We can override it to do something after the view had been loaded, such as load background image to a button.



- Start a new iPhone OS Application using View-Based Application Template. Add a Button using Interface Builder. Assign the Tag of the button, say 10.

- Drag a image into the Resources folder. eg. Home.png, it will be our background image of the button.

- Modify our ViewController.m, un-comment the method viewDidLoad and add the code below.

- (void)viewDidLoad {
    UIImage *buttonImage_Home = [UIImage imageNamed:@"Home.png"];
 UIImage *stretchableButtonImageNormal = [buttonImage_Home stretchableImageWithLeftCapWidth:12 topCapHeight:0];
 UIButton *homeButton = (UIButton *)[self.view viewWithTag:10];
 [homeButton setBackgroundImage:stretchableButtonImageNormal forState:UIControlStateNormal];
}

ipad development

Download iPhone SDK 3.2 beta today, start developing iPad Apps.

iPhone Developer Program members can download iPhone SDK 3.2 beta today, start developing the next generation of innovative applications for new Apple iPad.

iPhone SDK 3.2 beta

iPhone SDK 3.2 beta contains all the tools you need to start developing and optimizing iPhone OS applications for iPad.

iPad Simulator

The iPad Simulator lets you build and run your iPad application on your Mac, allowing you to lay out your user interface for the larger screen size, test your app’s memory usage, and shorten the debug cycle in the design process.

iPad Programming Guide

iPad provides new opportunities to create Multi-Touch iPhone OS applications on a larger display than ever. The iPad Programming Guide introduces new features available for iPad and how to implement those features in your applications.

iPad Human Interface Guidelines

Design an incredible user interface and user experience for your iPad application by following the iPad Human Interface Guidelines. Learn how to effectively use the new views and controls available to you to deliver unforgettable applications to your customers.

iPad Sample Code

Get started developing innovative universal applications for iPad, iPhone and iPod touch by downloading iPad sample code. Each sample code project is buildable and provides an example of how to accomplish a task for a specific technology.

Preparing Universal Applications

Developers can now start planning for universal applications, allowing them to take full advantage of the technologies found on iPad, iPhone, and iPod touch with a single binary.

Learn More...

AlertView

The creation and usage of Alert is very similar to Action Sheet.

Here, a AlertView will be shown if user click NO in the Action Sheet, to prompt user that the application is kept running.

- (void)actionSheet:(UIActionSheet *)actionSheet 
didDismissWithButtonIndex:(NSInteger)buttonIndex 
{ 
    if (buttonIndex == [actionSheet destructiveButtonIndex]) 
    { 
  exit(0);
    } 
 else
 {
  UIAlertView *alert =[[UIAlertView alloc]
        initWithTitle:@"No Exit"
        message:@"Application keep running"
        delegate:self
        cancelButtonTitle:@"OK"
        otherButtonTitles:nil];
  [alert show];
  [alert release];
 }
} 

ActionSheet

In this exercise, we will implement a ActionSheet on the last exercise "Programmatically quit a iPhone OS application", to double confirm exiting after the button pressed, and before exit the application.

Action sheets are used to force the user to make a choice between two or more items. It comes up from the bottom of the screen and displays a series of buttons for
the user to select.

Modify the header file, iPhoneExitViewController.h.

#import <UIKit/UIKit.h>

@interface iPhoneExitViewController : UIViewController <UIActionSheetDelegate>{

}
- (IBAction)exitButtonPressed:(id)sender;
@end

Modify iPhoneExitViewController.m to implement the IBAction exitButtonPressed, and actionSheet.

@implementation iPhoneExitViewController
- (IBAction)exitButtonPressed:(id)sender{
 UIActionSheet *actionSheet = [[UIActionSheet alloc] 
                                  initWithTitle:@"Confirm to Exit?" 
                                  delegate:self 
                                  cancelButtonTitle:@"No!" 
                                  destructiveButtonTitle:@"Yes" 
                                  otherButtonTitles:nil]; 
    [actionSheet showInView:self.view]; 
    [actionSheet release]; 
}

- (void)actionSheet:(UIActionSheet *)actionSheet 
didDismissWithButtonIndex:(NSInteger)buttonIndex 
{ 
    if (buttonIndex == [actionSheet destructiveButtonIndex]) 
    { 
        exit(0);
    } 
} 

For sure, you have to create the UI to include a Exit button using Interface Builder, and connect the IBAction to the Exit button. Refer the article "General steps to implement and connect a IBAction".

Programmatically quit a iPhone OS application

According to iPhone OS Reference Library Q&A, Q: How do I programmatically quit my iPhone OS application? There is no API provided for gracefully terminating an iPhone application.

Alternatively, we can use exit(0) to force the iPhone application to terminate.


@implementation iPhoneExitViewController
- (IBAction)exitButtonPressed:(id)sender{
exit(0);
}

iPhone OS Reference Library

iPhone OS Reference Library
The iPhone OS Reference Library is your bookshelf for detailed information essential to iPhone OS application development.