swift - [UIActivityIndi​​catorView发布] : message sent to deallocated instance in swift-3

Question

我在我的 api 调用机制中使用事件指示器，在隐藏 HUD 时，代码会崩溃并发出“[UIActivityIndi​​catorView release]:消息发送到已释放实例”的错误。

这是堆栈:

 * thread #1, queue = 'com.apple.main-thread', stop reason = EXC_BREAKPOINT (code=1, subcode=0x18a5e6ea8)
  * frame #0: 0x000000018a5e6ea8 CoreFoundation`___forwarding___ + 744
    frame #1: 0x000000018a4e2d4c CoreFoundation`_CF_forwarding_prep_0 + 92
    frame #2: 0x000000018a4c2a80 CoreFoundation`-[__NSArrayI dealloc] + 84
    frame #3: 0x0000000189062134 libobjc.A.dylib`(anonymous namespace)::AutoreleasePoolPage::pop(void*) + 836
    frame #4: 0x0000000190711c3c UIKit`-[UIView dealloc] + 1604
    frame #5: 0x0000000189062134 libobjc.A.dylib`(anonymous namespace)::AutoreleasePoolPage::pop(void*) + 836
    frame #6: 0x000000018a4beb28 CoreFoundation`_CFAutoreleasePoolPop + 28
    frame #7: 0x000000018a58ecec CoreFoundation`__CFRunLoopRun + 1580
    frame #8: 0x000000018a4beda4 CoreFoundation`CFRunLoopRunSpecific + 424
    frame #9: 0x000000018bf28074 GraphicsServices`GSEventRunModal + 100
    frame #10: 0x0000000190779058 UIKit`UIApplicationMain + 208
    frame #11: 0x0000000100147448 GraspIO-Dev`main at AppDelegate.swift:14
    frame #12: 0x00000001894cd59c libdyld.dylib`start + 4

我不明白我犯了什么错误，这是我的显示和隐藏代码。

func execute( _ params : String..., serverResponse: @escaping (ServerResponseModel) -> Void) {
        //print("params:\(params)");

        if self.mCallingView != nil {
            DispatchQueue.main.async{
                self.showLoadingHUD()
            }
          }
        }

        makeWebServiceCall(params){
            response in
            //print("\n\n response: \(response)")
            DispatchQueue.main.async { 
                 serverResponse(response!)
                if self.mCallingView != nil {
                  self.hideLoadingHUD()   
                }
            }
        }
    }

    fileprivate func showLoadingHUD() {
        let hud = MBProgressHUD.showAdded(to: mCallingView!, animated: true)
        hud.label.text = "Please wait..."
    }

    fileprivate func hideLoadingHUD() {
        let _ = MBProgressHUD.hide(for: mCallingView!, animated: true)
        mCallingView!.isUserInteractionEnabled = true
        mCallingView = nil
    }

应用程序在隐藏 HUD 时会崩溃，对堆栈溢出进行了研究，但找不到解决方案。

Answer 1

该错误非常具有描述性。您正在尝试将已经发布的内容设置为零。现在你需要找到你做这件事的地方以及避免这种情况的方法。正如您提到的，您在隐藏它的同时得到了它。所以你已经把注意力集中在这个问题上了。

fileprivate func hideLoadingHUD() {
    let _ = MBProgressHUD.hide(for: mCallingView!, animated: true)
    mCallingView!.isUserInteractionEnabled = true
    mCallingView = nil
}

这里。您正在尝试使mCallingView = nil。删除此行并检查是否出现错误。您真的需要使源 View 为零，同时隐藏事件指示器吗？