UIViewController.presentViewController中的iOS崩溃

debugcn 发表于 Dev

蓝天医疗

我遇到了间歇性（很少发生）崩溃，到目前为止，只有AppStore的报告才在野外发生。使用有限的崩溃日志，我无法解决该问题。

我正在尝试显示App Store产品页面视图。这是代码

The enclosing class includes the SKStoreProductViewControllerDelegate  and
the delegate is set to self.

@objc func adTap(sender: UITapGestureRecognizer? = nil) -> Void {
    if  adAppID.isEmpty {return}
    let paramDict = [SKStoreProductParameterITunesItemIdentifier: adAppID]
    storeProductViewController.loadProduct(withParameters: paramDict, completionBlock: { (status: Bool, error: Error?) -> Void in
        if status {
            self.storeProductViewController.view.frame.origin.y = 0
            let eventParams = ["AppID": self.adAppID]
            self.present(self.storeProductViewController, animated: true, completion: nil)
        }
        else {
            if let error = error {
                print("Error: \(error.localizedDescription)")
            }
        }})
}

该错误在self.present上触发：

#8  (null) in thunk for @escaping @callee_guaranteed (@unowned Bool, @guaranteed Error?) -> () ()

#7  0x100b68350 in closure #1 in ViewController.adTap(sender:)

#6  (null) in -[UIViewController presentViewController:animated:completion:] ()

#0  (null) in __exceptionPreprocess ()

转储实际的Cashpoint文件会显示SIGABRT：

Exception Type:  EXC_CRASH (SIGABRT)
Exception Codes: 0x0000000000000000, 0x0000000000000000
Exception Note:  EXC_CORPSE_NOTIFY
Triggered by Thread:  0

Last Exception Backtrace:
0   CoreFoundation                  0x1ad1db278 __exceptionPreprocess + 220 (NSException.m:199)
1   libobjc.A.dylib                 0x1acf040a4 objc_exception_throw + 56 (objc-exception.mm:565)
2   UIKitCore                       0x1b0bcbe0c -[UIViewController _presentViewController:withAnimationController:completion:] + 4880 (UIViewController.m:7185)
3   UIKitCore                       0x1b0bce074 __63-[UIViewController _presentViewController:animated:completion:]_block_invoke + 104 (UIViewController.m:7671)
4   UIKitCore                       0x1b0bce570 -[UIViewController _performCoordinatedPresentOrDismiss:animated:] + 508 (UIViewController.m:7772)
5   UIKitCore                       0x1b0bcdfc4 -[UIViewController _presentViewController:animated:completion:] + 196 (UIViewController.m:7678)
6   UIKitCore                       0x1b0bce22c -[UIViewController presentViewController:animated:completion:] + 160 (UIViewController.m:7716)
7   MyAppName                       0x100b68350 closure #1 in ViewController.adTap(sender:) + 1016 (ViewController.swift:991)
8   MyAppName                       0x100b68580 thunk for @escaping @callee_guaranteed (@unowned Bool, @guaranteed Error?) -> () + 60 (<compiler-generated>:0)
9   StoreKit                        0x1bba3c1e8 -[SKStoreProductViewController _loadDidFinishWithResult:error:] + 48 (SKStoreProductViewController.m:425)
10  StoreKit                        0x1bba3e624 -[SKRemoteProductViewController loadDidFinishWithResult:error:] + 128 (SKRemoteProductViewController.m:61)

///////

我理解完成块是一个隐式转义的块，但是我看不到它是如何不能满足块规范的（参数，如果确实是问题所在）。同样，这是一个间歇性事件。从未在连接到Xcode的设备上或在我们不受限制的设备之一上看到它。最近，它已在现场发生，一次是在运行iOS 13的iPhone 7上，一次是在运行12.3.1的X上

/////

任何想法将不胜感激

基里尔S.

现在让我写这作为答案，因为我现在看到的评论可能不清楚。块

if status {
        self.storeProductViewController.view.frame.origin.y = 0
        let eventParams = ["AppID": self.adAppID]
        self.present(self.storeProductViewController, animated: true, completion: nil)
    }

访问某些UI元素，但它可能未在主线程上运行（因为它位于回调内部）。因此，我首先怀疑的是，如果它恰巧在主线程之外被调用，它将崩溃。因此，我会尝试这样做：

if status {
    DispatchQueue.main.async {
        self.storeProductViewController.view.frame.origin.y = 0
        let eventParams = ["AppID": self.adAppID]
        self.present(self.storeProductViewController, animated: true, completion: nil) 
    }
}

如果有帮助，也许考虑更好的MVC分离...

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