cocos2d子层访问父层的三种步骤
cocos2d子层访问父层的三种方法
在SecondLayer就可以通过这样的方式来访问HelloWorldLayer的-(void) setlable方法:
第三种、协议委托方法:
情景设定:父层HelloWorldLayer有一个方法-(void) setlable;需要被其子层SecondLayer访问。
第一种、半单例方法:
首先在HelloWorldLayer.h声明+(HelloWorldLayer*) shareLayer
+(HelloWorldLayer*) shareLayer;
然后在HelloWorldLayer.m加入:
#import "SecondLayer.h" static HelloWorldLayer* HelloWorldLayerInstance; +(HelloWorldLayer*) shareLayer { return HelloWorldLayerInstance; } -(id) init { // always call "super" init // Apple recommends to re-assign "self" with the "super" return value if( (self=[super init])) { HelloWorldLayerInstance=self; SecondLayer* sl=[[SecondLayer alloc] init]; sl.tag=10; [self addChild:sl z:100]; self.isTouchEnabled=YES; ////................. } return self; } -(void) setlable { clickNum++; [label setString:[NSString stringWithFormat:@"ParentLayer clickNum:%i",clickNum]]; }
在SecondLayer就可以通过这样的方式来访问HelloWorldLayer的-(void) setlable方法:
[[HelloWorldLayer shareLayer] setlable];
第二种、self.parent强制访问方法:
HelloWorldLayer中只需按正常添加子层SecondLayer即可(HelloWorldLayer.m中):
-(id) init { // always call "super" init // Apple recommends to re-assign "self" with the "super" return value if( (self=[super initWithColor:ccc4(0, 255, 255,255)])) { HelloWorldLayerInstance=self; SecondLayer* sl=[[SecondLayer alloc] init]; sl.tag=10; [self addChild:sl z:100]; self.isTouchEnabled=YES; ////................. } return self; }
在SecondLayer就可以通过这样的方式来访问HelloWorldLayer的-(void) setlable方法:
[(HelloWorldLayer*)self.parent setlable];
第三种、协议委托方法:
在SecondLayer.h中加入:
#import <Foundation/Foundation.h> #import "cocos2d.h" @protocol callParentDelegate <NSObject> -(void) setlable; @end @interface SecondLayer : CCLayer{ id<callParentDelegate> delegate; } @property(nonatomic,retain) id<callParentDelegate> delegate; @endSecondLayer.m中@synthesize delegate;
然后在HelloWorldLayer.h中加入<callParentDelegate>协议:
@interface HelloWorldLayer :CCLayer <callParentDelegate> { CCLabelTTF *label; int clickNum; }
在HelloWorldLayer.m中实现:
-(void) setlable { clickNum++; [label setString:[NSString stringWithFormat:@"ParentLayer clickNum:%i",clickNum]]; }
在添加SecondLayer子层注意设子委托:
SecondLayer* sl=[[SecondLayer alloc] init]; sl.tag=10; sl.delegate=self; [self addChild:sl z:100]; self.isTouchEnabled=YES;
在SecondLayer就可以通过这样的方式来访问HelloWorldLayer的-(void) setlable方法:
[self.delegate setlable];还有更好的办法,欢迎各位交流!