SpriteKit内存管理预加载缓存和fps问题

我的问题非常简单，根据苹果文档，您可以在呈现场景之前将纹理预加载到 RAM 中，如下所示：

SKTextureAtlas * atlas = [SKTextureAtlas atlasNamed:@"effect_circle_explode"];
SKTextureAtlas * atlas2 = [SKTextureAtlas atlasNamed:@"box_explodes"];
SKTextureAtlas * atlas3 = [SKTextureAtlas atlasNamed:@"fence_new"];
SKTextureAtlas * atlas4 = [SKTextureAtlas atlasNamed:@"swipe"];
SKTextureAtlas * atlas5 = [SKTextureAtlas atlasNamed:@"coin"];
SKTextureAtlas * atlas6 = [SKTextureAtlas atlasNamed:@"two_times"];
SKTextureAtlas * atlas7 = [SKTextureAtlas atlasNamed:@"three_times"];
SKTextureAtlas * atlas8 = [SKTextureAtlas atlasNamed:@"gus"];

[SKTextureAtlas preloadTextureAtlases:@[atlas, atlas2, atlas3, atlas4, atlas5, atlas6, atlas7, atlas8] withCompletionHandler:^{

    [moron_logo removeFromSuperview];
    moron_logo = NULL;

    stuff.hidden = NO;
    store.hidden = NO;

    scroll_view.userInteractionEnabled = YES;

    [self present_game_view];


}];

现在，如果稍后在整个游戏过程中您还像这样调用同一个图集的预加载，则会产生负面影响：

-(void)load
{

SKTextureAtlas * atlas = [SKTextureAtlas atlasNamed:@"effect_circle_explode"];
SKTextureAtlas * atlas2 = [SKTextureAtlas atlasNamed:@"coin"];

[SKTextureAtlas preloadTextureAtlases:@[atlas, atlas2] withCompletionHandler:^{

explode_textures = [[NSMutableArray alloc] init];
int numImages = (int)atlas.textureNames.count;
for (int i=0; i <= numImages/2-1; i++)
{
    NSString *textureName = [NSString stringWithFormat:@"effect_circle_explode_%d.png", i];
    SKTexture *temp = [atlas textureNamed:textureName];
    [explode_textures addObject:temp];
}

explodeAnimation = [SKAction animateWithTextures:explode_textures timePerFrame:.05];

idle_textures = [[NSMutableArray alloc] init];
int numImages2 = (int)atlas.textureNames.count;
for (int i=0; i <= numImages2/2-1; i++)
{
    NSString *textureName = [NSString stringWithFormat:@"coin_%d.png", i];
    SKTexture *temp = [atlas2 textureNamed:textureName];
    [idle_textures addObject:temp];
}


idleAnimation = [SKAction animateWithTextures:idle_textures timePerFrame:.05];

[self animate:0];

}];


}

现在，如果我不再次预加载纹理，如果我直接将纹理插入到 SKAction 中，游戏实际上会偶尔崩溃，而不是一直崩溃。崩溃是 Sprite::update(double) 调用上的 exec_bad_access ，所以我的假设是，第一次预加载的纹理以某种方式从 RAM 中删除，这就是为什么我现在每次创建新节点时都预加载。它似乎已经修复了该错误。然而，当涉及到性能时，这会导致另一个问题，这也是我问这个问题的原因。

The game runs fine on the 5S and the 5 but as soon you touch an iPod touch 5th gen it barely can go over 15 FPS. I ran instruments and this is what is eating up all the CPU time: Could this be related to my constant call of the preloadatlas call? Does anyone know why this would be eating my processor time up so badly on older devices? Thanks so much and hopefully someone else might be having a similar problem and this will help them out once I make my way to bottom of it.

提前致谢。

每次创建新精灵时预加载地图集通常是一个坏主意。

您的实际问题似乎是您预加载了地图集，但没有保留它们。除非图集变量是全局的。

一旦执行预加载的方法返回，atlas 对象就会不再被引用，并将自动从内存中删除。 Sprite Kit 内部实现了一个缓存系统，因此您不会立即注意到它，但最终一个或多个地图集将会消失。

对场景中的每个图集保持强引用，以便图集保留在内存中，并在运行时停止预加载。我不知道这是否有助于提高帧率。