Xcode 8.2 app Crash - [viewcontroller .cxx_destruct]符号化崩溃报告

Question

App遇到崩溃后无法理解此次崩溃的原因。这个崩溃报告我是从App Store获得的。这是崩溃报告截图

它主要影响iOS 10.2。在本课程中，我使用的是谷歌地图，Pageviewcontroller和Timer。所以，任何人都可以告诉我如何找出它？

Answer 1

由于使用 addObserver forKeyPath:@"myLocation" options:NSKeyValueObservingOptionNew从Google地图获取用户当前位置，因此发生了此次崩溃。

在dealloc Google Maps中，您需要删除此观察者。否则应用程序将崩溃并出现以下错误

  

NSInternalInconsistencyException：类GMSMapView的实例0x1759f350已取消分配，而键值观察者仍在其中注册。当前观察信息:(上下文：0x0，属性：0x177a4490＆gt;）

在将Google地图添加到mapView之前，您需要先添加地址：

// 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];
 }
}

然后添加此代码以删除观察者

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

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