Mac OS X and ios operating systems. Lecture 2 Objective-C. Tomasz Idzi

Transcription

1 Lecture 2 Objective-C

2 Contact tomasz.idzi@eti.pg.gda.pl

3 Agenda Object-Oriented Programming Defining Classes Working with Objects Demo Summary

4 Object-Oriented Programming

5 Object-Oriented Programming

6 Object-Oriented Programming - Inheritance Car Vechicle

7 Object-Oriented Programming - Inheritance NSString NSMutableString NSObject UIResponder UIView UIControl UIButton

8 Defining Classes - Person : NSObject

9 Defining Classes - Person : NSString NSString *lastname;

10 Defining Classes - Property Person : (readonly) NSString (readonly) NSString *lastname;

11 Defining Classes - Method Declarations - (void)printname;

12 Defining Classes - Method With Parameters - (void)printnamewith:(nsstring*)name;

13 Defining Classes - Method With Parameters - (void)printnamewith:(nsstring*)name NSLog(@ Person name is: %@, name);

14 Defining Classes - Class files Person : NSString NSString *lastname; - (void)printname; - (void)printnamewith:(nsstring*)name; Person.m #import Person - (void)printname NSLog(@ Person name is: %@, self.firstname);

15 Defining Classes - Class Factory Methods Person : NSString NSString *lastname; - (void)printname; - (void)printnamewith:(nsstring*)name; + (void)printfirstname:(nsstring*)fname andlastname:(nsstring*)lname; Person.m + (void)printfirstname:(nsstring*)fname andlastname:(nsstring*)lname; NSLog(@ Person with first name: %@ and last name: %@, fname, lname);

16 Working with Objects - initialization Person *newperson = [[Person alloc] init]; Person *newperson = [Person new];

17 Working with Objects - Send and Receive Messages Person *newperson = [Person new]; [newperson printnamewith:@ Lisa ];

18 Working with Objects - Send and Receive Messages #import Person.h [Person printfirstname:@ Lisa andlastname:@ Simpson ];

19 Working with Objects - Send and Receive Messages 1 Current Execution Point [newperson printnamewith:@ Lisa ]; Person Person 2 - (void)printnamewith:(nsstring*)name d NSLog(@ Person name is: %@, name);

20 Working with Objects - Objects as parameters - (void)printname:(person *)person; - (void)printname:(person *)person NSLog(@ Person name is: %@, person.firstname);

21 Working with Objects - return values - (Person*)createPersonWithName:(NSString *)name; - (Person*)createPersonWithName:(NSString *)name Person *newperson = [Person new]; newperson.firstname = name; return newperson;

22 Working with Objects - send messages to implementation Person - (void)sayhello [self printnamewith:@ Lisa ] - (void)printnamewith:(nsstring *)name NSLog(@ Person name is: %@, name);

23 Working with Objects - Send and Receive Messages 1 Current Execution Point [newperson sayhello]; 3 Person Person - (void)sayhello [self printnamewith:@ Lisa ]; d 2 - (void)printnamewith:(nsstring*)name NSLog(@ Person name is: %@, name);

24 Polymorphism

25 Polymorphism Person : NSObject - (void)printname; Simpson : Person - (void)printname; - (void)printname NSLog(@ I m person ); - (void)printname NSLog(@ I m Simpson! );

26 Polymorphism - (void)printname NSLog(@ I m person ); - (void)printname NSLog(@ I m Simpson! ); Person *newperson = [Person new]; Simpson *newsimpson = [Simpson new]; [newperson printname]; [newsimpson printname];

27 Polymorphism - (void)printname NSLog(@ I m person ); - (void)printname NSLog(@ I m Simpson! ); Person *newperson = [Person new]; Simpson *newsimpson = [Simpson new]; [newperson printname]; [newsimpson printname]; I m person I m Simpson!

28 Polymorphism - (void)printname NSLog(@ I m person ); Person *newperson = [Person new]; Simpson *newsimpson = [Simpson new]; [newperson printname]; [newsimpson printname]; I m person I m person

29 DEMO

30 Summary type name parm name - (void)printnamewith:(nsstring*)name; return value type parm type