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ios - ConvertPointFromView 返回 NAN

我试图用一些SKSpriteNode对象填充我的场景。但是,在其他View中,我已经将这些对象用作UIImageView的对象。所以我有法线坐标,我正在尝试转换为GL坐标。我是这样做的:SKSpriteNode*title=[SKSpriteNodespriteNodeWithImageNamed:@"labirinto_title"];CGPointtitlePoint=CGPointMake(238.0,50.0);//coordinatesalreadyknown.NSLog(@"X1:%f,Y1:%f",titlePoint.x,titlePoint.y);CGPointtit