所以我试图从Cocos2D示例的EaseActionsTest示例中实现alterTime方法到我的游戏中。更改来自不同课程的CCSpeed的行动?
我试图将这个想法落实到我的游戏中,为我的游戏创建一个冻结时间类型的加电。我用CCMenu设置了一个单独的HUDLayer,将小行星的CCSpeed更改为0以停止移动。我已经建立了一个CCLog,以确保我的freezeTime方法被调用,它的确如此,但小行星的CCSpeeds保持不变。这是我的代码更清晰。
HUDLayer.h
#import "ActionLayer.h"
@interface HUDLayer : CCLayer {
GameObject *asteroid;
}
-(void)freezeTime:(ccTime)dt;
HUDLayer.mm
-(void)freezeTime:(ccTime)dt
{
id action = [asteroid getActionByTag:kTagAsteroidAction];
[action setSpeed:0.0f];
CCLOG(@"Freeze!");
}
-(void)createPowerUpButtons
{
CGSize winSize = [CCDirector sharedDirector].winSize;
CCSprite *freeze = [CCSprite spriteWithSpriteFrameName:@"powerup.png"];
CCMenuItem *freezeButton = [CCMenuItemImage itemFromNormalSprite:freeze selectedSprite:nil target:self selector:@selector(freezeTime)];
CCMenu *powerUpMenu = [CCMenu menuWithItems:freezeButton, nil];
powerUpMenu.position = ccp(winSize.width * 0.5, winSize.height * 0.1);
[self addChild:powerUpMenu];
}
-(id)init
{
if((self = [super init]))
{
[self createPowerUpButtons];
}
return self;
}
ActionLayer.h
#import "HUDLayer.h"
#import "GameObject.h"
enum Actions
{
kTagAsteroidAction = 1
};
@interface ActionLayer : CCLayer
{
GameObject *asteroid;
}
ActionLayer.mm
-(void)updateAsteroids:(ccTime)dt
{
// ---------------------------------------------
// Code to set random sizes and speeds for the asteroids from the array...
// ---------------------------------------------
// Move it offscreen to the left, and when it's done, call removeNode
id action = [CCSequence actions:
[CCMoveBy actionWithDuration:randDuration position:ccp(-winSize.width - asteroid.contentSize.width, 0)],
[CCCallFuncN actionWithTarget:self selector:@selector(invisNode:)], nil];
[action setTag:kTagAsteroidAction];
[asteroid runAction:[CCSpeed actionWithAction:action speed:1.0f]];
[self schedule:@selector(freezeTime:) interval:1.0f];
}
}
-(void)update:(ccTime)dt
{
[self updateAsteroids:dt];
}
我试图得到尽可能接近的EaseActionsTest例子,因为我可以,但我不断收到关于启动此错误:
'+[NSInvocation invocationWithMethodSignature:]: method signature argument cannot be nil'
我认为这是因为 - (void)freezeTime:(ccTime)dt,因为在此之前,我最初尝试只用 - (void)freezeTime;我会收到我在freezeTime方法中设置的CCLog,发现它被调用,但小行星的速度不受影响。
而且,我想:
-(void)freezeTime
{
id action = [asteroid getActionByTag:kTagAsteroidAction];
[action setSpeed:0.1f];
CCLOG(@"Freeze!");
}
-(id)init
{
if((self = [super init]))
{
[self freezeTime];
}
return self;
}
我只注意到速度不在这里要么影响。
关于我能做些什么的任何想法?任何有用的想法总是感激!