我开始查看示例项目（链接here的示例游戏特别有帮助）我看到触摸的处理通常不在CCSprite中完成。相反，实例化CCSprites的CCLayer会对触摸事件做出反应并迭代它创建的精灵以检测触摸了哪个CCSprite（如果有的话）。
我希望CCSprites能够处理他们是否被自己触摸过，并调用 up 来通知它已被触摸（如果需要）。在/ tests / TouchesTest下找到的Paddle类就是这样 - 它自己处理触摸。
所以，我的问题是：对此最佳做法是什么？在中心位置处理触摸并通过子节点迭代以查看触摸的内容是否更好？或者每个孩子应该处理自己的触摸事件？或者没关系？
我希望每个孩子都能处理自己的触摸事件，但我想遵循最佳实践（如果存在的话）。谢谢！
答案 0 :(得分：17)
我认为这是一个偏好问题，但我喜欢通过子类化CCSprite来触及sprite。我在我的CCSprite子类中创建一个getter方法，从子类中检索状态变量，然后主程序可以相应地执行。
以下是我的CCSprite子类“spuButton”的示例头文件：
#import "cocos2d.h"
typedef enum tagButtonState {
kButtonStatePressed,
kButtonStateNotPressed
} ButtonState;
typedef enum tagButtonStatus {
kButtonStatusEnabled,
kButtonStatusDisabled
} ButtonStatus;
@interface spuButton : CCSprite <CCTargetedTouchDelegate> {
@private
ButtonState state;
CCTexture2D *buttonNormal;
CCTexture2D *buttonLit;
ButtonStatus buttonStatus;
}
@property(nonatomic, readonly) CGRect rect;
+ (id)spuButtonWithTexture:(CCTexture2D *)normalTexture;
- (void)setNormalTexture:(CCTexture2D *)normalTexture;
- (void)setLitTexture:(CCTexture2D *)litTexture;
- (BOOL)isPressed;
- (BOOL)isNotPressed;
@end
以下是.m文件的示例：
#import "spuButton.h"
#import "cocos2d.h"
@implementation spuButton
- (CGRect)rect
{
CGSize s = [self.texture contentSize];
return CGRectMake(-s.width / 2, -s.height / 2, s.width, s.height);
}
+ (id)spuButtonWithTexture:(CCTexture2D *)normalTexture
{
return [[[self alloc] initWithTexture:normalTexture] autorelease];
}
- (void)setNormalTexture:(CCTexture2D *)normalTexture {
buttonNormal = normalTexture;
}
- (void)setLitTexture:(CCTexture2D *)litTexture {
buttonLit = litTexture;
}
- (BOOL)isPressed {
if (state == kButtonStateNotPressed) return NO;
if (state == kButtonStatePressed) return YES;
return NO;
}
- (BOOL)isNotPressed {
if (state == kButtonStateNotPressed) return YES;
if (state == kButtonStatePressed) return NO;
return YES;
}
- (id)initWithTexture:(CCTexture2D *)aTexture
{
if ((self = [super initWithTexture:aTexture]) ) {
state = kButtonStateNotPressed;
}
return self;
}
- (void)onEnter
{
[[CCTouchDispatcher sharedDispatcher] addTargetedDelegate:self priority:0 swallowsTouches:YES];
[super onEnter];
}
- (void)onExit
{
[[CCTouchDispatcher sharedDispatcher] removeDelegate:self];
[super onExit];
}
- (BOOL)containsTouchLocation:(UITouch *)touch
{
return CGRectContainsPoint(self.rect, [self convertTouchToNodeSpaceAR:touch]);
}
- (BOOL)ccTouchBegan:(UITouch *)touch withEvent:(UIEvent *)event
{
if (state == kButtonStatePressed) return NO;
if ( ![self containsTouchLocation:touch] ) return NO;
if (buttonStatus == kButtonStatusDisabled) return NO;
state = kButtonStatePressed;
[self setTexture:buttonLit];
return YES;
}
- (void)ccTouchMoved:(UITouch *)touch withEvent:(UIEvent *)event
{
// If it weren't for the TouchDispatcher, you would need to keep a reference
// to the touch from touchBegan and check that the current touch is the same
// as that one.
// Actually, it would be even more complicated since in the Cocos dispatcher
// you get NSSets instead of 1 UITouch, so you'd need to loop through the set
// in each touchXXX method.
if ([self containsTouchLocation:touch]) return;
//if (buttonStatus == kButtonStatusDisabled) return NO;
state = kButtonStateNotPressed;
[self setTexture:buttonNormal];
}
- (void)ccTouchEnded:(UITouch *)touch withEvent:(UIEvent *)event
{
state = kButtonStateNotPressed;
[self setTexture:buttonNormal];
}
@end
希望这有助于和快乐的编码！
添加tick方法和解释（对于Stephan的问题）：
要检查按钮的状态，我有一个tick：方法，它基本上会触发每一帧并检查我所有按钮的状态。
-(void)tick:(ccTime)dt {
do my button checks here....
}
我通过调用isPressed或isNotPressed函数来检查我的按钮的状态，该函数是我的spuButton类的一部分。
for (spuButton *aButton in _fourButtonsArray) {
if ([aButton isNotPressed]) continue; //this button is not pressed
.....otherwise record that it is pressed.....
}
然后我做同样的检查，看看它是否已被释放并做出相应的反应。我是这样做的，因为我希望能够对多个按钮按下组合做出反应，而且我想在按下它时做一些事情，然后在它被释放时做其他事情。我使用ccTouchBegan和ccTouchEnded来更改纹理（精灵图像）并相应地更改状态变量。
答案 1 :(得分：0)
只是添加到此主题。 Mark还提供了一个如何实例化spuButton的示例：
Problem with cocos2d and orientation changes, textures are deformed
你也可以修改这个例子来传递正常和点亮的按钮图像，如下所示：
+ (id)spuButtonWithTexture:(CCTexture2D *)normalTexture lit:(CCTexture2D *)litTexture
然后做同样的事情：
- (id)initWithTexture:(CCTexture2D *)normalTexture lit:(CCTexture2D *)litTexture
在此方法中，您可以设置两个纹理：
[self setNormalTexture:normalTexture];
[self setLitTexture:litTexture];
答案 2 :(得分：0)
这是我的解决方案，基于CCSprite希望它对某些人有用
这是受控对象的协议（如播放器或其他东西）：
@class AGSensitiveButton;
@protocol AGSensitiveButtonControlledObjectProtocol <NSObject>
@required
- (void)sensitiveButtonTouchDown:(AGSensitiveButton *)sButton;
- (void)sensitiveButtonTouchUp:(AGSensitiveButton *)sButton;
@optional
- (void)sensitiveTouchButtonKeepPressed:(AGSensitiveButton *)sButton forTime:(ccTime)pressTime;
@end
.h文件：
#import "CCSprite.h"
#import "cocos2d.h"
#import "AGSensitiveButtonControlledObjectProtocol.h"
typedef enum {
AGSensitiveButtonStateNormal = 0,
AGSensitiveButtonStateHighlighted,
AGSensitiveButtonStateDisabled
} AGSensitiveButtonState;
@interface AGSensitiveButton : CCSprite <CCTargetedTouchDelegate>
@property (nonatomic, assign, getter = isEnabled) BOOL enabled;
@property (nonatomic, assign) ccTime maximumTouchDuration;
@property (nonatomic, weak) id <AGSensitiveButtonControlledObjectProtocol> controlledObject;
@property (nonatomic, copy) void (^touchDownHandler)();
@property (nonatomic, copy) void (^touchUpHandler)();
+ (id)buttonWithNormalTexture:(CCTexture2D *)normalTexture
highlightedTexture:(CCTexture2D *)highTexture;
+ (id)buttonWithNormalTexture:(CCTexture2D *)normalTexture
highlightedTexture:(CCTexture2D *)highTexture
disabledtexture:(CCTexture2D *)disabledTexture;
+ (id)buttonWithNormalTexture:(CCTexture2D *)normalTexture
highlightedTexture:(CCTexture2D *)highTexture
controllerObject:(id <AGSensitiveButtonControlledObjectProtocol>)controlledObject;
+ (id)buttonWithNormalTexture:(CCTexture2D *)normalTexture
highlightedTexture:(CCTexture2D *)highTexture
disabledtexture:(CCTexture2D *)disabledTexture
controlledObject:(id <AGSensitiveButtonControlledObjectProtocol>)controlledObject;
+ (id)buttonWithNormalTexture:(CCTexture2D *)normalTexture
highlightedTexture:(CCTexture2D *)highTexture
disabledtexture:(CCTexture2D *)disabledTexture
controlledObject:(id <AGSensitiveButtonControlledObjectProtocol>)controlledObject
touchDownHandler:(void(^)(void))touchDownHandler
touchUpHandler:(void(^)(void))touchUpHandler;
- (void)setTexture:(CCTexture2D *)texture forState:(AGSensitiveButtonState)state;
- (BOOL)isHighlighted;
@end
实现.m文件：
#import "AGSensitiveButton.h"
@interface AGSensitiveButton ()
@property (nonatomic, assign) AGSensitiveButtonState state;
@property (nonatomic, strong) NSDictionary *stateTextures;
@property (nonatomic, assign) ccTime currentTouchTime;
@end
@implementation AGSensitiveButton
+ (id)buttonWithNormalTexture:(CCTexture2D *)normalTexture
highlightedTexture:(CCTexture2D *)highTexture {
return [self buttonWithNormalTexture:normalTexture
highlightedTexture:highTexture
controllerObject:nil];
}
+ (id)buttonWithNormalTexture:(CCTexture2D *)normalTexture
highlightedTexture:(CCTexture2D *)highTexture
disabledtexture:(CCTexture2D *)disabledTexture {
return [self buttonWithNormalTexture:normalTexture
highlightedTexture:highTexture
disabledtexture:disabledTexture
controlledObject:nil];
}
+ (id)buttonWithNormalTexture:(CCTexture2D *)normalTexture
highlightedTexture:(CCTexture2D *)highTexture
controllerObject:(id <AGSensitiveButtonControlledObjectProtocol>)controlledObject {
return [self buttonWithNormalTexture:normalTexture
highlightedTexture:highTexture
disabledtexture:nil
controlledObject:controlledObject];
}
+ (id)buttonWithNormalTexture:(CCTexture2D *)normalTexture
highlightedTexture:(CCTexture2D *)highTexture
disabledtexture:(CCTexture2D *)disabledTexture
controlledObject:(id <AGSensitiveButtonControlledObjectProtocol>)controlledObject {
return [self buttonWithNormalTexture:normalTexture
highlightedTexture:highTexture
disabledtexture:disabledTexture
controlledObject:controlledObject
touchDownHandler:NULL
touchUpHandler:NULL];
}
+ (id)buttonWithNormalTexture:(CCTexture2D *)normalTexture
highlightedTexture:(CCTexture2D *)highTexture
disabledtexture:(CCTexture2D *)disabledTexture
controlledObject:(id <AGSensitiveButtonControlledObjectProtocol>)controlledObject
touchDownHandler:(void(^)(void))touchDownHandler
touchUpHandler:(void(^)(void))touchUpHandler {
AGSensitiveButton *button = [[self alloc] initWithTexture:normalTexture
rect:CGRectMake(0.0, 0.0, normalTexture.contentSize.width, normalTexture.contentSize.height)];
[button setTexture:normalTexture forState:AGSensitiveButtonStateNormal];
[button setTexture:highTexture forState:AGSensitiveButtonStateHighlighted];
[button setTexture:disabledTexture forState:AGSensitiveButtonStateDisabled];
button.controlledObject = controlledObject;
button.touchDownHandler = touchDownHandler;
button.touchUpHandler = touchUpHandler;
return button;
}
- (void)setEnabled:(BOOL)enabled {
[self setupNewState:enabled ? AGSensitiveButtonStateNormal : AGSensitiveButtonStateDisabled];
}
- (BOOL)isEnabled {
return (self.state != AGSensitiveButtonStateDisabled);
}
- (BOOL)isHighlighted {
return (self.state == AGSensitiveButtonStateHighlighted);
}
- (void)toggleTextureForCurrentState {
CCTexture2D *textureToSet = [self.stateTextures objectForKey:[NSNumber numberWithInteger:self.state]];
if (textureToSet) {
self.texture = textureToSet;
self.textureRect = CGRectMake(0.0, 0.0, textureToSet.contentSize.width, textureToSet.contentSize.height);
}
}
- (void)setTexture:(CCTexture2D *)texture forState:(AGSensitiveButtonState)state {
NSMutableDictionary *newStates = self.stateTextures.mutableCopy;
if (texture) {
[newStates setObject:texture forKey:[NSNumber numberWithInteger:state]];
} else {
[newStates removeObjectForKey:[NSNumber numberWithInteger:state]];
}
self.stateTextures = newStates.copy;
}
- (NSDictionary *)stateTextures {
if (!_stateTextures) {
_stateTextures = [[NSDictionary alloc] init];
}
return _stateTextures;
}
- (void)onEnter {
[super onEnter];
[self toggleTextureForCurrentState];
[[[CCDirector sharedDirector] touchDispatcher] addTargetedDelegate:self priority:0 swallowsTouches:YES];
[self scheduleUpdate];
}
- (void)onExit {
[super onExit];
[self unscheduleUpdate];
[[[CCDirector sharedDirector] touchDispatcher] removeDelegate:self];
}
- (void)update:(ccTime)dt {
if ((self.state == AGSensitiveButtonStateHighlighted) && (self.maximumTouchDuration)) {
self.currentTouchTime+=dt;
if (self.currentTouchTime >= self.maximumTouchDuration) {
[self ccTouchEnded:nil withEvent:nil];
} else {
if ([self.controlledObject respondsToSelector:@selector(sensitiveTouchButtonKeepPressed:forTime:)]) {
[self.controlledObject sensitiveTouchButtonKeepPressed:self forTime:self.currentTouchTime];
}
}
}
}
- (CGRect)rectForTouches {
return CGRectMake(-self.contentSize.width/2, -self.contentSize.height/2,
self.contentSize.width, self.contentSize.height);
}
- (void)forwardTouchDownEventIntoHandlers {
if ([self.controlledObject respondsToSelector:@selector(sensitiveButtonTouchDown:)]) {
[self.controlledObject sensitiveButtonTouchDown:self];
}
if (self.touchDownHandler) {
self.touchDownHandler();
}
}
- (void)forwardTouchUpEventIntoHandlers {
if ([self.controlledObject respondsToSelector:@selector(sensitiveButtonTouchUp:)]) {
[self.controlledObject sensitiveButtonTouchUp:self];
}
if (self.touchUpHandler) {
self.touchUpHandler();
}
}
- (void)setupNewState:(AGSensitiveButtonState)state {
if (self.state != state) {
switch (state) {
case AGSensitiveButtonStateHighlighted: {
[self forwardTouchDownEventIntoHandlers];
break;
}
default: {
if (self.state == AGSensitiveButtonStateHighlighted) {
[self forwardTouchUpEventIntoHandlers];
}
break;
}
}
self.state = state;
[self toggleTextureForCurrentState];
}
}
#pragma mark - CCTargetedTouchDelegate
- (BOOL)ccTouchBegan:(UITouch *)touch withEvent:(UIEvent *)event {
if ((self.state != AGSensitiveButtonStateNormal) || (!CGRectContainsPoint([self rectForTouches], [self convertTouchToNodeSpaceAR:touch]))) {
return NO;
}
self.currentTouchTime = 0.0;
[self setupNewState:AGSensitiveButtonStateHighlighted];
return YES;
}
- (void)ccTouchMoved:(UITouch *)touch withEvent:(UIEvent *)event {
if (self.state == AGSensitiveButtonStateHighlighted) {
if (!CGRectContainsPoint([self rectForTouches], [self convertTouchToNodeSpaceAR:touch])) {
[self ccTouchEnded:touch withEvent:event];
}
}
}
- (void)ccTouchEnded:(UITouch *)touch withEvent:(UIEvent *)event {
if (self.state == AGSensitiveButtonStateHighlighted) {
[self setupNewState:AGSensitiveButtonStateNormal];
}
}
@end