Xcode 8.2 应用程序崩溃 -[viewcontroller .cxx_destruct] 符号化崩溃报告

Question

应用程序出现以下崩溃，无法理解此崩溃背后的原因。这个崩溃报告是我从 App Store 得到的。这是崩溃报告截图

它主要影响 iOS 10.2。在此 class 中，我使用 Google 地图、Pageviewcontroller 和计时器。那么，谁能告诉我怎么弄出来的？

Answer 1

发生此崩溃是由于使用 addObserver forKeyPath:@"myLocation" options:NSKeyValueObservingOptionNew 从 Google 地图获取用户当前位置。

while dealloc Google Maps，那个时候你需要移除这个Observer。否则应用程序将崩溃并出现以下错误

NSInternalInconsistencyException: An instance 0x1759f350 of class GMSMapView was deallocated while key value observers were still registered with it. Current observation info: ( Context: 0x0, Property: 0x177a4490> )

在将 Google 地图添加到 mapView 之前，您需要添加观察者，如下所示：

// Listen to the myLocation property of GMSMapView.
[mapView_ addObserver:self
         forKeyPath:@"myLocation"
            options:NSKeyValueObservingOptionNew
            context:NULL];

self.view = mapView_;

// Ask for My Location data after the map has already been added to the UI.
dispatch_async(dispatch_get_main_queue(), ^{
   mapView_.myLocationEnabled = YES;
});

#pragma mark - KVO updates

- (void)observeValueForKeyPath:(NSString *)keyPath
                  ofObject:(id)object
                    change:(NSDictionary *)change
                   context:(void *)context {
if (!firstLocationUpdate_) {
// If the first location update has not yet been received, then jump to that
// location.
  firstLocationUpdate_ = YES;
  CLLocation *location = [change objectForKey:NSKeyValueChangeNewKey];
mapView_.camera = [GMSCameraPosition cameraWithTarget:location.coordinate
                                                 zoom:14];
 }
}

然后添加此代码也用于删除观察者

- (void)dealloc {
[mapView_ removeObserver:self
            forKeyPath:@"myLocation"
               context:NULL];
}

更多详情：Google Maps iOS SDK, Getting Current Location of user

Xcode 8.2 应用程序崩溃 -[viewcontroller .cxx_destruct] 符号化崩溃报告

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