ios – Swift 3：’Int’类型的表达式模式不能匹配’UnsafeMutableRawPointer’类型的值

我正在将应用程序迁移到 Swift 3,但是Xcode在这个函数中抛出一个错误：

错误是在案例条件(“contentSize”,MyObservationContext)
我这样做是为了更新uiwebview的内容大小

var MyObservationContext = 0
override func observeValue(forKeyPath keyPath: String?, of object: Any?, change: [NSKeyValueChangeKey : Any]?, context: UnsafeMutableRawPointer?) {
    guard let keyPath = keyPath else {
        super.observeValue(forKeyPath: nil, of: object, change: change, context: context)
        return
    }
    switch (keyPath, context) {
    case("contentSize", MyObservationContext):
        webviewHeightConstraint.constant = TextoHtml.scrollView.contentSize.height
    default:
        super.observeValue(forKeyPath: keyPath, of: object, change: change, context: context)
    }
}

我愿意接受建议,谢谢.

案件需要

case("contentSize", .some(&MyObservationContext)):

.some是为了确保上下文不是零

&安培;获取指向MyObservationContext的指针,以便它可以将指针与指针进行比较.