iOS设计模式：装饰
2017-03-01 本文已影响29人
younger_times
视频资源-极客学院
ps:感觉打的一手好广告啊，因为自己不太爱看视频，但这类又必须看才能明白。粘贴源代码是为了以后查阅方便，也注释了自己的理解。
GamePad.h（Component）
原生产厂家生产的游戏手柄
#import <Foundation/Foundation.h>
@interface GamePad : NSObject
/**
* 上下左右的操作
*/
- (void)up;
- (void)down;
- (void)left;
- (void)right;
/**
* 选择与开始的操作
*/
- (void)select;
- (void)start;
/**
* 按钮 A + B + X + Y
*/
- (void)commandA;
- (void)commandB;
- (void)commandX;
- (void)commandY;
@end
#import "GamePad.h"
@implementation GamePad
- (void)up {
NSLog(@"up");
}
- (void)down {
NSLog(@"down");
}
- (void)left {
NSLog(@"left");
}
- (void)right {
NSLog(@"right");
}
- (void)select {
NSLog(@"select");
}
- (void)start {
NSLog(@"start");
}
- (void)commandA {
NSLog(@"commandA");
}
- (void)commandB {
NSLog(@"commandB");
}
- (void)commandX {
NSLog(@"commandX");
}
- (void)commandY {
NSLog(@"commandY");
}
@end
GamePadDecorator.h （Decorator）
装饰者,几乎和GamePad一样的操作
/**
* 上下左右的操作
*/
- (void)up;
- (void)down;
- (void)left;
- (void)right;
/**
* 选择与开始的操作
*/
- (void)select;
- (void)start;
/**
* 按钮 A + B + X + Y
*/
- (void)commandA;
- (void)commandB;
- (void)commandX;
- (void)commandY;
#import "GamePadDecorator.h"
@interface GamePadDecorator ()
@property (nonatomic, strong) GamePad *gamePad; #引用
@end
@implementation GamePadDecorator
- (instancetype)init {
self = [super init];
if (self) {
self.gamePad = [[GamePad alloc] init]; #初始化时，实例化GamePad
}
return self;
}
- (void)up {
[self.gamePad up];
}
- (void)down {
[self.gamePad down];
}
- (void)left {
[self.gamePad left];
}
- (void)right {
[self.gamePad right];
}
- (void)select {
[self.gamePad select];
}
- (void)start {
[self.gamePad start];
}
- (void)commandA {
[self.gamePad commandA];
}
- (void)commandB {
[self.gamePad commandB];
}
- (void)commandX {
[self.gamePad commandX];
}
- (void)commandY {
[self.gamePad commandY];
}
GamePadDecorator.h(ConcreteDecoratorA)
装饰者的拓展，可以添加新方法
#import "GamePadDecorator.h"
@interface CheatGamePadDecorator : GamePadDecorator
- (void)cheat;
@end
#import "CheatGamePadDecorator.h"
@implementation CheatGamePadDecorator
- (void)cheat {
[self up];
[self down];
[self up];
[self down];
[self left];
[self right];
[self left];
[self right];
[self commandA];
[self commandB];
[self commandA];
[self commandB];
}
iOS的category进行扩展
GamePad+Cheat.h
#import "GamePad.h"
@interface GamePad (Cheat)
- (void)cheat;
@end
#import "GamePad+Cheat.h"
@implementation GamePad (Cheat)
- (void)cheat {
[self up];
[self down];
[self up];
[self down];
[self left];
[self right];
[self left];
[self right];
[self commandA];
[self commandB];
[self commandA];
[self commandB];
}
@end
