我有以下代码
private func addRunLoopObserverForSaving() {
var _self = self
withUnsafeMutablePointer(&_self) { (pSelf) -> Void in
var observerContext = CFRunLoopObserverContext(
version: 0,
info: pSelf,
retain: nil,
release: nil,
copyDescription: nil)
withUnsafeMutablePointer(&observerContext, { (pObserverContext) -> Void in
let observer = CFRunLoopObserverCreate(
kCFAllocatorDefault,
CFRunLoopActivity.BeforeTimers.rawValue,
true,
0,
{ (observer, activity, context) -> Void in
guard context != nil else { return }
let pObserverContext = UnsafeMutablePointer<CFRunLoopObserverContext>(context)
let pGraphsModel = UnsafeMutablePointer<GraphsModel>(pObserverContext.memory.info)
let z = pGraphsModel.memory
...
},
pObserverContext
)
CFRunLoopAddObserver(CFRunLoopGetCurrent(), observer, kCFRunLoopDefaultMode)
})
}
}
由于某些原因，linez = pGraphsModel.memory总是给我一个EXC_BAD_ACCESS。我不确定UnsafeMutablePointer在检索存储值时是否使用正确。任何想法表示赞赏！
PS。这发生在XCode 7 beta5上。
我自己进行了修复，结果context在回调中实际上是观察者上下文的info成员。因此，而不是：
let pObserverContext = UnsafeMutablePointer<CFRunLoopObserverContext>(context)
let pGraphsModel = UnsafeMutablePointer<GraphsModel>(pObserverContext.memory.info)
let z = pGraphsModel.memory
...
应该只是
let pGraphsModel = UnsafeMutablePointer<GraphsModel>(context)
let z = pGraphsModel.memory
...
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我来说两句