Fadeto动画不起作用。Cocos2d.

Question

根据这个代码节点必须慢慢出现，对吧？它不起作用。什么是错的？

   CCNodeColor *_backNode = [CCNodeColor nodeWithColor:[CCColor colorWithRed:0 green:0 blue:0    alpha:1.0f]];
    _backNode.opacity=0;
    [self addChild:_backNode z:5];
  [_backNode runAction:[CCActionFadeTo actionWithDuration:2 opacity:0.9]];

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Answer 1

使用alpha= 0而不是设置透明度：

CCNodeColor *_backNode = [CCNodeColor nodeWithColor:[CCColor colorWithRed:0 
                                                                    green:0
                                                                     blue:0
                                                                    alpha:0.0f]];

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