pedrosakey/RPSGame

Udacity example Objective with annotations and more information

The Rock Paper Scissors Game: RPSGame

Overview

This is an example of one ios app written in Objective C. You can find the source of this example in Objective-C for Swift Developers in Udacity

Class Diagram

Objective-C code snippets from this example

Print in console with NSLog

NSLog(@"RPSGame!");

Alloc memory space for a variable

RPSController *controller = [[RPSController alloc]init];

The header file, public interface. For accessing to methods (messages in bojective C) from differents classes must be appear here.

@interface RPSGame : NSObject
.
.
.
@end

Properties must be define in public interface

@property (nonatomic) RPSTurn *firstTurn;

Initializers pattern,

- (instancetype)initWithFirstTurn:(RPSTurn*) playerTurn secondTurn: (RPSTurn*)computerTurn {
    self = [super init];
    
    if(self) {
        _firstTurn = playerTurn;
        _secondTurn = computerTurn;
    }
    
    return self;
}

Use enum

typedef NS_ENUM(NSInteger, Move) {
    Rock,
    Paper,
    Scissors,
    Invalid
};

Generate a ramdom number

NSUInteger ramdomNumber = arc4random_uniform(3);

Switch statatement

switch (self.move) {
        case Rock:
            return @"Rock";
            break;
        
        case Paper:
            return @"Paper";
            break;
        
        case Scissors:
            return @"Scissors";
            break;
            
        default:
            return @"Invalid";
            break;
    }

String format

// Build the resultsString here.
    NSString *wholeString =  [NSString stringWithFormat:@"%@ %@ %@ %@ %@", winnerString, @" defeats ", loserString, @".",  resultsString];

License

MIT