objective c - CCSprite disappears for unknown reason -

-(void)touchbegan:(uitouch*)touch withevent:(uievent*)event {     cgpoint touchpoint = [touch locationinnode:self];     [_gameball setposition:cgpointmake(touchpoint.x,self.gameball.position.y)]; } 

after touch _gameball sprite not visible anymore, reason why happens?i logged , isvisible gameball true , touchpoint within content size of ccnode.

---

#import "gamescene.h"  @interface gamescene()  @property (nonatomic,strong) ccsprite* gameball;  @end @implementation gamescene  @synthesize gameball = _gameball;  +(gamescene*)gameinstance {     return [[self alloc]init]; } -(id)init {     self = [super init];     if (self) {         //implement          //user interaction         self.userinteractionenabled = yes;          //create ball         _gameball = [ccsprite spritewithimagenamed:@"small_blue_ball.png"];         _gameball.position = ccp(0.5f,0.1f);         _gameball.positiontype = ccpositiontypenormalized;         [self addchild:_gameball];       }     return self; } -(void)onenter {     [super onenter]; } -(void)onexit {     [super onexit]; } -(void)touchbegan:(uitouch *)touch withevent:(uievent *)event {     cgpoint touchpoint = [touch locationinnode:self];     touchpoint = [self converttonodespace:touchpoint];     [_gameball setposition:cgpointmake(touchpoint.x, self.gameball.position.y)];     nslog(@"%f , %f",_gameball.position.x,_gameball.position.y); } -(void)touchmoved:(uitouch *)touch withevent:(uievent *)event {  } @end 

that .m file

now .h file

#import "cocos2d-ui.h" #import "cocos2d.h"  @interface introscene : ccscene +(ccscene*)scene; @end 

cgpoint touchpoint = [touch locationinnode:self]; touchpoint = [self converttonodespace:touchpoint]; 

might problem.. try changing to:

cgpoint touchpoint = [touch locationinview:[touch view]]; touchpoint = [self converttonodespace:touchpoint]; 

-edit-

ok, try:

cgpoint touchpoint = [touch locationinview:[touch view]]; touchpoint = [[self parent] converttonodespace:touchpoint]; 

-edit2-

just noticed cgpointmake:

[_gameball setposition:cgpointmake(touchpoint.x, self.gameball.position.y)]; 

might not special, should keep code monotone, in if used _gameball.position use _gameball.position.y

so might want change to:

_gameball setposition:cgpointmake(touchpoint.x, _gameball.position.y)]; 

-edit3-

this seems work me:

cgpoint touchpoint = [touch locationinview:[touch view]]; touchpoint = [[_gameball parent] converttonodespace:touchpoint]; [_gameball setposition:ccp(touchpoint.x, _gameball.position.y)]; 

-final edit-

since using cocos2d, use cctouchesbegan function.. change to:

-(void)cctouchesbegan:(nsset *)touches withevent:(uievent *)event {     nsarray* toucharray = [touches allobjects];     (uitouch* touch in toucharray)     {         cgpoint touchpoint = [touch locationinview:[touch view]];         touchpoint = [_gameball converttonodespace:touchpoint];         [_gameball setposition:ccp(touchpoint.x, _gameball.position.y)];         break;     } } 

if doesn't register touches, add: [self settouchenabled:yes]; scene.