让sprite 循环跑

id action = [CCRepeatForever actionWithAction:  
                 [CCSequence actions:  
                  [CCDelayTime actionWithDuration:2.0f],  
                  [CCMoveTo actionWithDuration:0.01f position:position1],  
                  [CCScaleTo actionWithDuration:0.01f scale:0.5f],  
                  [CCFlipX actionWithFlipX:YES],  
                  [CCMoveTo actionWithDuration:8.5f position:position2],  
                  [CCScaleTo actionWithDuration:0.1f scale:1.0f],  
                  [CCFlipX actionWithFlipX:NO],  
                  [CCMoveTo actionWithDuration:7.5 position:position3],  
                  [CCScaleTo actionWithDuration:0.1f scale:2.0f],  
                  [CCFlipX actionWithFlipX:YES],  
                  [CCMoveTo actionWithDuration:6.5f position:position2],  
                  [CCFlipX actionWithFlipX:NO],  
                  [CCScaleTo actionWithDuration:0.1f scale:2.0f],  
                  [CCMoveTo actionWithDuration:5.5 position:position3],  
                  [CCFlipX actionWithFlipX:YES],  
                  [CCScaleTo actionWithDuration:0.1f scale:4.0f],  
                  [CCMoveTo actionWithDuration:4.5f position:position2],  
                  [CCCallFunc actionWithTarget: self selector:@selector(dropCargo)],  
                  [CCMoveTo actionWithDuration:0.0f position:offScreen],  
                 nil]  
             ];  

dropcargo 让NPC给玩家投下物品

循环在position1,2,3之间移动。