我怎样才能为这个精灵设置动画？
if ((self = [super initWithSpriteFrameName:@"Boss_ship_5.png" world:world shapeName:@"Boss_ship" maxHp:50 healthBarType:HealthBarTypeRed])) {
我正在尝试这个，但是 _layer 不起作用......
CCSpriteFrameCache * cache =
[CCSpriteFrameCache sharedSpriteFrameCache];
CCAnimation *animation = [CCAnimation animation];
[animation addSpriteFrame:
[cache spriteFrameByName:@"Boss_ship_5.png"]];
[animation addSpriteFrame:
[cache spriteFrameByName:@"Boss_ship_4.png"]];
animation.delayPerUnit = 0.05;
[_layer runAction:
[CCRepeatForever actionWithAction:
[CCAnimate actionWithAnimation:animation]]];