Experiencing iOSDevelopment to Distribution

Tunvir Rahman TusherBrain Station 23

Apples mobile operating system considered the foundation of the iPhone

Originally designed for the iPhone but now supports iPod touch, iPad.

Current available version of iOS is 7.1.2 and iOS 8 in beta As of June 2014 Apple contains over 1,200,000 iOS applications The reason behind iOS popularity is its great user experience.

What is iOS?

Four pillars of iOS development

iOS Development Requirements

Language: Objective C/Swift(beta)

IDE : XCode (Latest available one is 5.1.1)

Machine : Mac running OS X 10.6 or higher

For Distribution and test in real device we need a Developer Account

Xcode

Complete tool set for building Apps for Mac OS X And iOS.

includes the IDE: Compiler Tools for performance and behavior analysis iOS simulator

UI design Tool

iPhone/iPad UI design is extremely friendly(comparative to Android!) for Developer as the screen size of iOS devices are fixed.

For iPhone there is two screen size of 3.5 and 4 inch with resolution of 320×480, 640×960, 640×1136

For iPad the screen size is 7.9 and 9.7 inch with resolution of 1024×768(non-retina) and 2048×1536 (retina).

The design technique used for iOS is storyboard. In backend its actually an xml.

For universal app(for both iPhone and iPad) we can use two identical storyboard.

Design patterns

Many of the frameworks use well-known design patterns for implementing your application.

For example, MVC, Block, Delegate, Target-Action etc

Objective C Overview

Objective-C is an object oriented language.

follows ANSI C style coding with methods from Smalltalk

SUPERSET of CFlexible almost everything is done at runtime.

Dynamic BindingDynamic Typing(type id)Basic Framework is Cocoa,UIKit

Non-GUI – text output

Two standard functions you see used

printf() – same as C printf(“Hello World”); //this is actual C code

NSLog() NSLog(@”Hello World”); //this is strictly Objective-C

Primitive data types from C

int, short, long float,double Char

Operators same as C + - * / ++ --

Classes

Have both definition file and implementation file : classname.h and classname.m

Similar to how have .h and .cpp in C++

Declaring a class in ClassName.h

#import <Cocoa/Cocoa.h>@interface ClassName : Parent {

//class variables int age;

NSString name; }// methods declared

-(void)setAge:(int)number;-(void)setName:(NSString)n;-(int)getAge;-(NSString)getName;

@end

#import <standardimports.h>#import “local-your-otherfiles.h”

@interface ClassName: Parent { //class variables}

//methods-(return_type) methodName:(type)param1, (type) param2;

@end

Whats this + and – stuff?

When declaring or implementing functions for a class, they must begin with a + or -

+ indicates a “class method” that can only be used by the

class itself. (they are like static methods in Java invoked on class itself)

- indicates “instance methods” to be used by the client program (public functions) –invoked on an object / class

instance . (they are like regular methods in Java invoked on object)

Main Funciton –like C++

#import <whatever/what.h>

int main(int argc, const char *argv[])

{

@autoreleasepool {

//your code here*******

//you can have C code if you wish or Objective-C

return 0;

}

}

NOTE: Latest version of Objective-C uses AutomaticReference Counting (kind of like automatic garbage collection)

----to handle getting rid of not needed items in memory (avoidingmemory leaks). YEAH! AUTOMATIC!

-----like Java this way

@autoreleasepool in a needed annotation around your mainblock of code to “enable” this

Automatic Reference Counting

Objective C uses ‘AUTOMATIC reference counting' as memory management

keeps an internal count of how many times an Object is 'needed'.

System makes sure that objects that are needed are not deleted, and when an object is not needed it is deleted.

Declaring methods

C++ syntax

Objective-C syntax

void function(int x, int y, int z);

Object.function(x, y, z);

-(void)methodWithX : (int)x Y :(int)y andZ (int)z

[someObject methodWithX:1 Y:2 andZ:2];

-(return type) function_name: (type) p1, (type) p2, ***;Apply function to Objectpassing parameters x,y,z

Messages ---really weird (new) syntaxAlmost every object manipulation is done by sending objects a message

Two words within a set of brackets, the object identifier and the message to send.

Like C++ or Java’s Identifier.message()

[Identifier message ]

Memory Allocation

Objects are created dynamically through the keyword, “alloc” Objects are automatically deallocated in latest Objective-C

through automatic reference counting

Sample Allocation Of Object AClass *object=[[AClass alloc]initWithSomeThing];

Constructor Does not exist in Objective C

Static Binding/Overloading

Objective C overload method based on label,not parameter type/parameter sequence

Example -(void)someMethodWithA:(int)a WithB:(int)b; -(void)someMethodWithA:(double)a WithB:(int)b;

We have to do -(void)someMethodWithA:(int)a WithB:(int)b; -(void)someMethodWithX:(int)a WithX:(int)b;

NSString

NSString *theMessage = @”hello world”;

Number of characters in a string NSUInteger charCount = [theMessage length];

Test if 2 strings equal if([string_var_1 isEqual: string_var_2])

{ //code for equal case }

NSArray – holds fixed array of points to objectsNSArray *thearray = [NSArray arrayWithObjects:o1,o2,o3,o4, nil];

//get element[thearray objectAtIndex:0]; //element at index 0

Example

NSDate *now = [NSDate date];NSDate *tomorrow = [now dateByAddingTImeInterval:24.0*60.0*60.0]; //add a dayNSDate *yesterday = [now dateByAddingTimeInterval:-24.0*60.0*60.0]; //minus a day

//array of DatesNSArray *dateList = [NSArray arrayWithObjects:now, tomorrow, yesterday];

//get elements in arrayNSDate *first = [dateList objectAtIndex:0]; Methods are:

count = gets number of items in arrayobjectAtIndex:i = returns element i of array (starting from 0)

Note: you can not add or remove a pointer from an NSArray---fixed once created

NSMutableArray – changeable array of pointers to objects.

NSMutableArray *thearray = [NSArray arrayWithObjects:o1,o2,o3,o4, nil];

//get element[thearray objectAtIndex:0]; //element at index 0

ExampleNSDate *now = [NSDate date];NSDate *tomorrow = [now dateByAddingTImeInterval:24.0*60.0*60.0]; //add a dayNSDate *yesterday = [now dateByAddingTimeInterval:-24.0*60.0*60.0]; //minus a day

//array of DatesNSMutableArray *dateList = [NSMutableArray array];

//set elements[dateList addObject:now]; [dateList addObject:tomorrow];[dateList addObject:yesterday];

Methods are:array = gets empty NSMutableArrayaddObject:obj = adds as next element the obj to array

Note: you can add or remove a pointer from an NSMutableArray

iOS app Distribution Process

iOS Developer Program

$99/year provides

a complete and integrated process for developing and distributing iOS apps on the App

Store.

Test Your App in real Device

Prepare Dev certificate in developer portal with your mac keychain.

Download and install it in your mac.Add Devices to your portal(max 100)Prepare provisioning profile adding this certificate and devices you want to test.

In xcode set the provisioning profile and certuficate you made.

Build and Go!

Submit App To App Store

What we need?

1.A Distribution Certificate

2. A provisioning profile

3. App meta data like Some Screenshot of the app,Description etc

Create ipa(iOS executable) using certificate and provisioning profile and Submit it using itunes connect.

After both automated and manual testing the app is ready to sell. This process may take upto a week.

Some App rejection reasons

• Apps that crash/exhibit bugs/do not perform as advertised by the developer will be rejected.

• include undocumented or hidden features inconsistent with the description of the App will be rejected

• use non-public APIs will be rejected• install or launch other executable code will be rejected• App for Personal attacks/Violence/Damage or injury• App containing Objectionable content or Violate Privacy will

be rejected.

Thank you all.

Q/A?