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iOS iOS Design Patterns Two-Stage Object Creation Test: Two-stage Object Creation

Posted by james white
james white
78,399 Points

Out of this world with stars and asteroids..

So just guessing I implemented this code based on the code in the zip file

substituting "asteroid" for "star".

asteroid.h

@interface ColoredCircle : Circle

@property (nonatomic,retain) NSString* color;

-(instancetype) initWithDiameter:(float)d andColor:(NSString*)c;

+(ColoredCircle*) asteroid;

@end

asteroid.m

#import "ColoredCircle.h"

@implementation ColoredCircle


-(instancetype) init {
    return [self initWithDiameter:6 andColor:@"blue"]; // default diameter is 6, default color is "blue"
}

-(instancetype) initWithDiameter:(float)d andColor:(NSString *)c {
    self = [super initWithDiameter:d];
    if (self) {
        self.color = c;
    }
    return self;

}

+(ColoredCircle*) asteroid {
    ColoredCircle *s = [[ColoredCircle alloc] initWithDiameter:1.5 andColor:@"grey"];
    return s;
}


@end

The code seems to pass as long as you use the correct values for:

initWithDiameter:1.5 andColor:@"grey"

..however I kept getting all kinds of errors regarding missing a pointer to ColoredCircle

before I got to this point.

I guess I missed the whole section of the course which went

into how "alloc" effectively means using pointer(s) (somehow)..?

I don't know -- just very confusing..

Maybe (hopefully) I got most of this right (at least):

https://teamtreehouse.com/community/summary-clarification-for-class-factory-methods-in-ios