iPhone Camp Birmingham - Intro To Objective C

Intro to Objective-C Andria Jensen Co-Owner of Appsolute Genius http://www.appsolutegenius.com andria@appsolutegenius.com @andriajensen @appsolutegenius

Basics •superset of the C language •deﬁne separate header & source ﬁles •use #import to include headers

Classes

Typing •Strong vs Weak Type •the “id” keyword •object references are *pointers •value types are not pointers

Methods

Bracket Syntax •bracket syntax == [self doSomething] •dot syntax == self.myProperty •self.myProperty==[self myProperty]

Method calls You can also use dot syntax for assignment: This is the same as writing: [myAppObject setTheArray:aNewArray];

Implementation

Properties You will mostly see properties declared as @property (nonatomic, retain)

Properties @property(nonatomic, retain) NSString *text; translates as "I have a member variable of type NSString* named 'text'. I will want a getter/setter pair that uses the retain/release procedure." @property(nonatomic, assign) int value; translates as "I have a member variable of type int named 'value'. I will want a getter/setter pair that doesn't use the retain/release procedure - just assign it." @synthesize text; translates as "Please automatically create the code for the getter and setter for 'text'" @synthesize value; translates as "Please automatically create the code for the getter and setter for 'value'"

NSString •uses same placeholders as C •@ in front of literal strings •convenience methods

Questions? • Contact me • andria@appsolutegenius.com • @andriajensen • @appsolutegenius • The presentation:

iPhone Camp Birmingham - Intro To Objective C

by andriajensen on Dec 12, 2009

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iPhone Camp Birmingham - Intro To Objective C — Presentation Transcript