如何将对象添加到 NSPointerArray？

Question

我想在 NSPointerArray 中存储弱引用，但出现错误：

public var objectWithReloadFRC = NSPointerArray(options: NSPointerFunctionsWeakMemory)
objectWithReloadFRC.addPointer(self) //self is an UIViewController subclass

也试过这个：

objectWithReloadFRC.addPointer(UnsafePointer(self)

Answer 1

您可以获得指向用于对象的存储的指针 unsafeAddressOf()。由于 addPointer() 需要一个 mutable 指针， 需要另一个转换：

objectWithReloadFRC.addPointer(UnsafeMutablePointer(unsafeAddressOf(self)))

Swift 3:

var objectWithReloadFRC = NSPointerArray(options: .weakMemory)
objectWithReloadFRC.addPointer(Unmanaged.passUnretained(self).toOpaque())