iOS Application Development

iOS Application Development by Neha Goel

Agenda ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

How to develop an application ?

STEP 1: Get a Mac System ,[object Object]

STEP 2: Learn Objective C ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Create Interface File (.h) ,[object Object],[object Object],@interface classname : superclass{ // instance variables(class members); } + (return_type) classMethod; + (return_type) classMethod1WithParameter1:(parm1_type)parm1 parameter2:(parm2_type)parm2; - (return_type) instanceMethod1WithParameter1:(parm1_type)parm1 parameter2:(parm2_type)parm2; @end In the above, plus signs denote class methods (class static functions), or methods that can be called without an instance of the class, and minus signs denote instance methods (instance member functions), which can only be called within a particular instance of the class. Class methods also have no access to instance variables. (int) addWithOperand1: (int) op1 operand2: (int) op2; (Objective-C Syntax) int add (int op1,op2); (C Syntax)

Create Implementation File (.m) ,[object Object],#import “classname.h” @implementation classname + (return_type)classMethod { // implementation } - (return_type)instanceMethod { // implementation } @end Objective-C: (int) method :(int) i { return [self square_root:i]; } C : int function (int i) { return square_root(i); }

Methods ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Sending the message method to the object pointed to by the pointer obj would require the following code in C++: obj->method(argument); In Objective-C, this is written as follows: [obj method: argument];

Instantiation ,[object Object],[object Object],[object Object],[object Object]

Init Equals to CONSTRUCTOR in C++ -(id)initWithName : (NSString *) newN ame{ self=[super init]; if(self){ self.name=newName; } return self; } -(id)init{ self=[super init]; if(self){ } return self; }

Properties ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],@interface Person : NSObject { NSString *name; int age; } @property(copy) NSString *name; @property(readonly) int age; -(id)initWithAge:(int)age; @end Properties are implemented by way of the @synthesize keyword, which generates getter and setter methods according to the property declaration. @implementation Person @synthesize name;

self Keyword self.name= @”MyName” It is equivalent to: [self setName:@”MyName”]; name= @”MyName” Assignment to iVar name. getter setter NSString *tempName=nil; tempName=self.name; It is equivalent to: tempName=[self name];

Accessing Properties ,[object Object],[object Object],Person *aPerson = [[Person alloc] initWithAge: 53]; aPerson.name = @"Steve"; // NOTE: dot notation, uses synthesized setter, equivalent to [aPerson setName: @"Steve"]; NSLog(@"Access by message (%@), dot notation(%@), property name(%@) and direct instance variable access (%@)", [aPerson name], aPerson.name, [aPerson valueForKey:@"name"], aPerson->name);

Protocols ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Syntax ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

id Data Type ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],@interface LinkedListNode : NSObject{ id data; LinkedListNode *next; } - (id) data; - (LinkedListNode *) next; @end

Cocoa/Cocoa Touch Cocoa is an application environment for both the Mac OS X operating system and iOS, the operating system used on Multi-Touch devices such as iPhone, iPad, and iPod touch. It consists of a suite of object-oriented software libraries, a runtime system, and an integrated development environment. Cocoa in the architecture of iOS

Core OS ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Core Services ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Media ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Cocoa Touch ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Model View Controller(Composite Design Pattern) App Delegate( .h/.m) ViewController (.h/.m) View (.xib) Model(.h/.m)

Lets build Hello World ! ,[object Object]

iOS Application Development

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iOS Application Development