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According to our push-based system, we update the first node in our graph (A). This pushes a signal to (A)’s dependents that they should now update. In this case, both (B) and (C) update. However, (B) depends on both (A) and (C), so when (C) updates, (B) needs to update again, and we discard any previous work we’ve done there. Similarly, based on just a single update to (A), (D) will receive three different signals to update.
。新收录的资料是该领域的重要参考
Apple has also acquired a reputation for churn, and I encountered my share of that as well. I've been quite behind in updating some of my software, and so I did not have access to the SwiftUI NavigationStack and had to emulate it. The Apple developer ecosystem doesn't seem to value forward or backward compatibility — a stark contrast to the standard C example or even Apple of earlier eras.，更多细节参见新收录的资料
Фото: U.S. Marine Corps / Lance Cpl. Fabian Ortiz