[kj-code] category by choi.hj (jp ver.)

Category 2014.3.22 make kjcode choiheejin

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2014.3.22 make kjcode choiheejin

What is Category?

java/C++にはない機能

既存クラスの一部のメソッドを実装したモデュール

メソッドの追加のみある場合、Category使用

Page 3: [KJ-Code] Category By Choi.HJ (JP Ver.)

Page 4: [KJ-Code] Category By Choi.HJ (JP Ver.)

Class Sample

DrinkPriceClass

●getPrice

●getPriceFireKilimanjaro

●getPriceBossRainbow

Page 5: [KJ-Code] Category By Choi.HJ (JP Ver.)

Category Image1

DrinkPriceClass DrinkPriceClass+Fire

DrinkPriceClass+BossDrinkMachineClass

●getPrice ●getPriceKilimanjaro

●getPriceRainbowuse DrinkPriceClass!

●isDiscountKilimanjaro

Page 6: [KJ-Code] Category By Choi.HJ (JP Ver.)

Difference Inherit and Category

Page 7: [KJ-Code] Category By Choi.HJ (JP Ver.)

Inherit Image1DrinkPriceClass DrinkPriceSubClass

price1 price1price2

●getPrice ●getPricePlus200

can use getPrice!can override getPrice!

can add member!

can add method!

Page 8: [KJ-Code] Category By Choi.HJ (JP Ver.)

Category Image2DrinkPriceClass

DrinkPriceClass+Fire

DrinkPriceClass+Boss

DrinkMachineClassuse

can add method!

can not overide!

Page 9: [KJ-Code] Category By Choi.HJ (JP Ver.)

Category Strong Point

下位クラスを作成する必要がない。

元になるクラスが変更された場合、継承したクラスより影響が少な

い。

作業を分担しやすくなる。

命名規則を下記のよう作成することで可読性が高くなる。

クラス名＋カテゴリ名.h クラス名＋カテゴリ名.m

Page 10: [KJ-Code] Category By Choi.HJ (JP Ver.)

Category Weak Point

基本的にメンバー変数の追加ができない

Asscosiative Referencesという方法で追加ができ

る。（またの機会にikeさんからお願いしたいと思いま

す。。（＾_＾）/）

カテゴリ化するクラスの同じメソッドを作成できるが、プログラムは予測できない方式で動作する可能性がある。

Page 11: [KJ-Code] Category By Choi.HJ (JP Ver.)

additional info Why can not Overide?

DrinkPriceClass

DrinkPriceClass+Boss

●getPriceBoss

DrinkPriceClass+Fire●getPriceBoss

do you know price of Boss?

Page 12: [KJ-Code] Category By Choi.HJ (JP Ver.)

終了

質問

Page 13: [KJ-Code] Category By Choi.HJ (JP Ver.)

Thank you.

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