强制所有画布更新其内容。
画布在帧末尾、即将渲染前执行其布局和内容生成计算，以确保计算基于该帧期间可能发生的所有最新更改。也就是说，在 Start 回调和第一个 Update 回调中，画布下的布局和内容可能不是最新的。
依赖于最新布局或内容的代码可以调用该方法，以确保它在依赖它的代码前执行。
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