This document introduces iOS class and instance methods in Objective-C. It compares method declaration and calling syntax between Java and Objective-C. Class methods do not require an initialized object and are called with '+'. Instance methods require an initialized object and are called with '-'. The document also mentions controller objects and the view lifecycle in iOS.

1. Introduce to iOS
Rafael Sperling at ilegra

2. Documentation is your
God!

3. Class Methods

4. Class Methods (+)
Called: [UIView
areAnimationsEnabled];

5. Class Methods
Methods that do not require object initialized
• Declaration
•
To using
with +

6. Instance Methods (-)
Called: [[UIView alloc]
initWithFrame:frame];

7. Instance Methods
Methods that require object initialized
• Declaration
•
To using
with -

8. Java
Objective-C
Declaration:
Declaration:
void myMethod(void) {...}
-(void)myMethod {...}
To call:
To call:
myMethod();
[self myMethod];
Declaration:
Declaration:
void myMethod (int x) {...}
-(void)myMethod:(int)x {...}
To call:
To call:
myMethod(4);
[self myMethod:4];
Declaration:
void sqrt (int base, int exp{...}
To call:
sqrt(4,5);
Declaration:
-(void)sqrt:(int)base expNumber:(int)exp {...}
To call:
[self sqrt:4 exp:5];
Declaration:
Declaration:
int sqrt (int base, int exp) {
return ...; }
-(int) sqrt:(int)base expNumber:(int)exp {
return ...; }
To call:
To call:
int z = sqrt(4,5);
int z = [self base:4 expNumber:5];

9. Controller
object
Ref:
https://developer.apple.com/library/mac/documentation/general/conceptual/devpedia-cocoacore/ControllerObject.html#//apple_ref/doc/uid/TP40008195-CH11-SW1

10. Lifecycle of View

11. Thank you!
Rafael Sperling at ilegra