The primary signal is desiredSize on the controller. It can be positive (wants data), zero (at capacity), negative (over capacity), or null (closed). Producers are supposed to check this value and stop enqueueing when it's not positive. But there's nothing enforcing this: controller.enqueue() always succeeds, even when desiredSize is deeply negative.
主屏幕编辑菜单的液态玻璃透明度进一步提升，玻璃质感更明显，但在部分背景下会导致文字与图标的对比度下降，导致可读性变差；深色模式下的控制中心弹窗背景也同步变得更暗。
。91视频对此有专业解读
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