Question

我正在将CocoaPods与React Native应用程序一起使用。在Xcode模拟器中运行构建时，我遇到了各种错误。我在设备上运行它没有问题。这是启用断点后得到的：

- (void)ensureOnJavaScriptThread:(dispatch_block_t)block
    {
      RCTAssert(_jsThread, @"This method must not be called before the JS thread is created");

这里的错误是绿色的（虽然还可以，谢谢Xcode），它显示为com.facebook.react.JavaScript (9): breakpoint 1.2

禁用断点时出现两个错误，这是一个：

void Instance::loadApplication(std::unique_ptr<RAMBundleRegistry> bundleRegistry,
                                   std::unique_ptr<const JSBigString> string,
                                   std::string sourceURL) {
      callback_->incrementPendingJSCalls();
      SystraceSection s("Instance::loadApplication", "sourceURL",
                        sourceURL);
      nativeToJsBridge_->loadApplication(std::move(bundleRegistry), std::move(string),
                                         std::move(sourceURL));
    }

在callback_->行的红色错误显示为EXC_BAD_ACCESS (code=EXC_I386_GPFLT)

第二个是此代码中的signal SIGABRT错误：

int main(int argc, char * argv[]) { 
  @autoreleasepool {
    return UIApplicationMain(argc, argv, nil, NSStringFromClass([AppDelegate class]));
  }
}

我认为我已经通过启用僵尸解决了该问题。当我这样做时，我会在控制台中看到以下内容：

2018-07-11 16:56:08.326 [info][tid:main][RCTRootView.m:293] Running application Mapp ({
initialProps =     {
};
rootTag = 11;
})
=================================================================
Main Thread Checker: UI API called on a background thread: -[UIApplication setNetworkActivityIndicatorVisible:]
PID: 34682, TID: 5546845, Thread name: (none), Queue name: com.mixpanel.20e6d2c2b6c431dfecfdfaa100ec0a11.0x7fa94db06940.network, QoS: 0
Backtrace:
4   Mapp                           0x0000000103a31dd9 -[MPNetwork updateNetworkActivityIndicator:] + 121
5   Mapp                           0x0000000103a2ec09 -[MPNetwork flushQueue:endpoint:] + 985
6   Mapp                           0x0000000103a2e7b0 -[MPNetwork flushEventQueue:] + 64
7   Mapp                           0x0000000103a10418 __32-[Mixpanel flushWithCompletion:]_block_invoke + 312
8   libdispatch.dylib                   0x000000010e3f47ab _dispatch_call_block_and_release + 12
9   libdispatch.dylib                   0x000000010e3f57ec _dispatch_client_callout + 8
10  libdispatch.dylib                   0x000000010e3fdbe5 _dispatch_queue_serial_drain + 1305
11  libdispatch.dylib                   0x000000010e3fe4fa _dispatch_queue_invoke + 328
12  libdispatch.dylib                   0x000000010e3fa344 _dispatch_queue_override_invoke + 726
13  libdispatch.dylib                   0x000000010e40136c _dispatch_root_queue_drain + 664
14  libdispatch.dylib                   0x000000010e401076 _dispatch_worker_thread3 + 132
15  libsystem_pthread.dylib             0x000000010e920169 _pthread_wqthread + 1387
16  libsystem_pthread.dylib             0x000000010e91fbe9 start_wqthread + 13

这对我来说是无法理解的。我不明白怎么了提醒：即使启用了断点，此构建也不会破坏我的设备上的错误。这是我应该担心的事情吗？请帮忙！

Answer 1

因为您的代码为UI API called on a background thread。因此，请禁用xcode的主线程检查器。它会起作用。

编辑方案--->对角线--->运行时API检查--->主线程检查器（取消选中此设置）

注意：请始终在后台线程上更新以下方法中的UI

或

将[UIApplication setNetworkActivityIndicatorVisible:]方法放入DispatchQueue.main.async

    DispatchQueue.main.async { // Correct
        UIApplication.shared.isNetworkActivityIndicatorVisible = true // in swift 4
       [UIApplication setNetworkActivityIndicatorVisible:]// in objective-C
 }

https://developer.apple.com/documentation/code_diagnostics/main_thread_checker

Xcode构建在设备上运行，但在Simultor上失败

1 个答案: