Fat*_*tie 7 iphone cocoa drawrect ios
这是一个真正的谜.
想象一下,您正在进行在屏幕外绘制复杂图像的传统过程(CGLayer),并且您在绘制时间歇性地将图像更新到屏幕上.
如您所知,执行此操作的方法是:在后台运行大型绘图过程,并根据需要调用setNeedsDisplays的前景,从而更新图像.这是微不足道的,可以通过两行代码实现.
但是,当你这样做时,会出现一个神秘的问题:每个绘图周期所花费的时间,每次都会增加,变得无法使用.此外,时间可能不规律地变化.
这是一个已知的iOS错误,还是？谁看过这个吗？
这是一个非常简单,非常容易理解的应用程序,可以解决问题:
http://www.fileswap.com/dl/p8lU3gAi/stepwiseDrawingV2.zip.html
输出示例如下.
有谁知道为什么会这样？操作系统的行为非常奇怪.
后来 ...... FELZ已经找到了令人震惊的解决方案.Felz副本的CGLayer一次每一轮.这完全阻止了这种奇怪的行为.
然而,对于究竟发生了什么仍然没有真正清楚的理解:因此从字面上看,当奇怪的问题出现时,时间在哪里？
这是一个很长的输出示例......
请注意,您有时会得到一个"双重奇异"的结果,如下所示:它表现出"正常"奇怪的行为:每次都会增加时间.然而,偶尔会有几轮时间"非常快",然后返回.怪啊？此外,如果您在模拟器上运行,请快速单击Mac上不相关的应用程序,以获得"更奇怪"的结果.
尽管费尔兹给出了一个完美的工作答案,但实际的机制仍然是一个谜.
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fsa*_*int 10
首先让我说这是一个有趣的谜题.我在这个上工作很开心.不错的问题和很好的示例代码.
以下是我对可能答案的看法:
我看到的问题如下.CGLayer非常适合重复绘画,因为它们将渲染缓存为平面图像.将附加操作附加到上下文时,缓存无效.发生这种情况时,再次渲染CGLayer.减速是因为代码维护单个CGLayer(offscreenPrefabCGL),其在paintActualGutsOfHugeImage中的循环的每次迭代中都修改了其上下文.因为offscreenPrefabCGL的上下文中的操作序列随每个花朵而增长,所以每个渲染都需要更多时间.这解释了每个显示器的时间增加.
我看到两个解决方案:
我实施了(2)并取得了良好的效果.前100朵花更快,然后它将稳定在120毫秒(在设备中).我用最多2000朵花测试了我的修改版本.
我的修改版本是:
http://dl.dropbox.com/u/9866261/felz_mod_stepwiseDrawingV2.zip
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