ios - CADisplayLink 因为删除(来自 :forMode:) not deallocating view controller

Question

我面临一个奇怪的问题。

所以我创建了实例并进行了分配，如下所示

var displayLink:CADisplayLink?

private func setupDisplayLink () {

    self.displayLink = CADisplayLink(target: self, selector: #selector(displayLinkDidFire(link:)))
    self.displayLink?.preferredFramesPerSecond = 30
    self.displayLink?.add(to: .main, forMode: .common)
}

现在删除我的显示链接 Answer

self.displayLink?.remove(from: .main, forMode: .common) // comment this line and view controller correctly deallocated 
self.displayLink?.invalidate()

由于行 self.displayLink?.remove(from: .main, forMode: .common) 我的 deinit 方法未在 View Controller 中调用

在内存图中我无法识别真正的问题。我很幸运，我尝试评论该行并且它有效

为什么会这样呢？

Answer 1

像这样停止displayLink:

displayLink?.invalidate()
displayLink = nil