如何讓對象對Cocos2D中的觸摸做出反應？

Question

好的，所以我開始瞭解更多關於Coco2D的知識，但我有點受傷。我發現的很多教程都是針對過時的代碼版本的，所以當我仔細查看它們是如何做某些事情的時候，我無法將它翻譯成我自己的程序，因爲很多內容已經改變。據說，我正在使用最新版本的Coco2d 0.99版本。

我想要做的是在屏幕上創建一個精靈（完成），然後當我觸摸該精靈時，我可以有「事情」發生。現在，我們只是讓警報熄滅。現在，我得到了這個代碼在朋友的幫助下工作。這裏是頭文件：

// When you import this file, you import all the cocos2d classes 
#import "cocos2d.h" 

// HelloWorld Layer 
@interface HelloWorld : CCLayer 
{ 
CGRect spRect; 
} 

// returns a Scene that contains the HelloWorld as the only child 
+(id) scene; 

@end 

這裏是實現文件：

// 
// cocos2d Hello World example 
// http://www.cocos2d-iphone.org 
// 

// Import the interfaces 
#import "HelloWorldScene.h" 
#import "CustomCCNode.h" 

// HelloWorld implementation 
@implementation HelloWorld 

+(id) scene 
{ 
// 'scene' is an autorelease object. 
CCScene *scene = [CCScene node]; 

// 'layer' is an autorelease object. 
HelloWorld *layer = [HelloWorld node]; 

// add layer as a child to scene 
[scene addChild: layer]; 

// return the scene 
return scene; 
} 

// on "init" you need to initialize your instance 
-(id) init 
{ 
// always call "super" init 
// Apple recommends to re-assign "self" with the "super" return value 
if((self=[super init])) { 

    // create and initialize a Label 
    CCLabel* label = [CCLabel labelWithString:@"Hello World" fontName:@"Times New Roman" fontSize:64]; 

    // ask director the the window size 
    CGSize size = [[CCDirector sharedDirector] winSize]; 

    // position the label on the center of the screen 
    label.position = ccp(size.width /2 , size.height/2); 

    // add the label as a child to this Layer 
    [self addChild: label]; 

    CCSprite *sp = [CCSprite spriteWithFile:@"test2.png"]; 

    sp.position = ccp(300,200); 
    [self addChild:sp]; 
    float w = [sp contentSize].width; 
    float h = [sp contentSize].height; 
    CGPoint aPoint = CGPointMake([sp position].x - (w/2), [sp position].y - (h/2)); 
    spRect = CGRectMake(aPoint.x, aPoint.y, w, h); 






    CCSprite *sprite2 = [CCSprite spriteWithFile:@"test3.png"]; 
    sprite2.position = ccp(100,100); 
    [self addChild:sprite2]; 



    //[self registerWithTouchDispatcher]; 
    self.isTouchEnabled = YES; 



} 
return self; 
} 


// on "dealloc" you need to release all your retained objects 
- (void) dealloc 
{ 
// in case you have something to dealloc, do it in this method 
// in this particular example nothing needs to be released. 
// cocos2d will automatically release all the children (Label) 

// don't forget to call "super dealloc" 
[super dealloc]; 
} 

- (void)ccTouchesEnded:(NSSet *)touches withEvent:(UIEvent *)event { 
    UITouch *touch = [touches anyObject]; 
    //CGPoint location = [[CCDirector sharedDirector] convertCoordinate:[touch locationInView:touch.view]]; 
CGPoint location = [touch locationInView:[touch view]]; 

location = [[CCDirector sharedDirector] convertToGL:location]; 
if (CGRectContainsPoint(spRect, location)) { 
    UIAlertView *alert = [[UIAlertView alloc] 
     initWithTitle:@"Win" 
     message:@"testing" 
     delegate:nil cancelButtonTitle:@"okay" 
     otherButtonTitles:nil]; 

    [alert show]; 
    [alert release]; 
    NSLog(@"TOUCHES"); 
} 
NSLog(@"Touch got"); 

} 

然而，這僅適用於1個對象，我創建的CGRect的精靈。我無法做到2個精靈，我正在測試。所以我的問題是這樣的：我怎麼能讓屏幕上的所有精靈在觸摸時對同一事件做出反應？

對於我的程序，需要針對同一類型的所有對象運行相同的事件，以便讓它更容易一點。我嘗試了製作CCNode的一個子類並重寫了這個方法，但那根本不起作用......所以我做錯了什麼。幫助將不勝感激！

翻閱cocos2D中的「Touches」項目，看看我看到他們是如何做到的。它看起來像他們做了一個子類，並覆蓋了方法：

- (BOOL)ccTouchBegan:(UITouch *)touch withEvent:(UIEvent *)event 
- (void)ccTouchMoved:(UITouch *)touch withEvent:(UIEvent *)event 
- (void)ccTouchEnded:(UITouch *)touch withEvent:(UIEvent *)event 

所以現在我得弄清楚爲什麼我的不行...嗯...

Answer 1

我知道了。我有一些更多的代碼添加到自定義類：

頭文件：

// 
// CustomCCNode.h 
// Coco2dTest2 
// 
// Created by Ethan Mick on 3/11/10. 
// Copyright 2010 Wayfarer. All rights reserved. 
// 

#import "cocos2d.h" 


@interface CustomCCNode : CCSprite <CCTargetedTouchDelegate> { 

} 

@property (nonatomic, readonly) CGRect rect; 


@end 

實現：

// 
// CustomCCNode.m 
// Coco2dTest2 
// 
// Created by Ethan Mick on 3/11/10. 
// Copyright 2010 Wayfarer. All rights reserved. 
// 

#import "CustomCCNode.h" 
#import "cocos2d.h" 


@implementation CustomCCNode 

- (CGRect)rect 
{ 
    CGSize s = [self.texture contentSize]; 
    return CGRectMake(-s.width/2, -s.height/2, s.width, s.height); 
} 



- (BOOL)containsTouchLocation:(UITouch *)touch 
{ 
    return CGRectContainsPoint(self.rect, [self convertTouchToNodeSpaceAR:touch]); 
} 

- (void)onEnter 
{ 
    [[CCTouchDispatcher sharedDispatcher] addTargetedDelegate:self priority:0 swallowsTouches:YES]; 
    [super onEnter]; 
} 


- (void)onExit 
{ 
    [[CCTouchDispatcher sharedDispatcher] removeDelegate:self]; 
    [super onExit]; 
} 





- (BOOL)ccTouchBegan:(UITouch *)touch withEvent:(UIEvent *)event 
{ 
    NSLog(@"ccTouchBegan Called"); 
    if (![self containsTouchLocation:touch]) return NO; 
    NSLog(@"ccTouchBegan returns YES"); 
    return YES; 
} 

- (void)ccTouchMoved:(UITouch *)touch withEvent:(UIEvent *)event 
{ 
    CGPoint touchPoint = [touch locationInView:[touch view]]; 
    touchPoint = [[CCDirector sharedDirector] convertToGL:touchPoint]; 

    NSLog(@"ccTouch Moved is called"); 
} 

- (void)ccTouchEnded:(UITouch *)touch withEvent:(UIEvent *)event 
{ 
    NSLog(@"ccTouchEnded is called"); 
} 


@end 

Answer 2

我在這一個初學者，但這個文件救了我很多麻煩，我現在明白了更多的東西，並且正確實例化它的方式是:(至少我是怎麼做到的）

+(id)scene{ 
    CustomCCNode *myNode = [CustomCCNode spriteWithFile:@"myPng.png"]; 
    myNode.position = ccp(150,150); 
    [scene addChild:myNode]; 
    return scene; 
} 

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