将 GMSPolygon 或 GMSPolyline 添加到 map 时，iOS Google Map SDK 崩溃

Question

根据入门指南添加了所有内容。加载 map ，我可以毫无问题地将 GMSMarker 添加到 map 中。我有一个绘制多边形的方法，但应用程序每次都会崩溃。

方法:

-(void)drawPolygon
{
    GMSMutablePath* path = [[GMSMutablePath alloc] init];
    [path addCoordinate:CLLocationCoordinate2DMake(-91.13343811039999, 42.6450805664)];
    [path addCoordinate:CLLocationCoordinate2DMake(-91.0180969238,42.6452140808)];
    [path addCoordinate:CLLocationCoordinate2DMake(-90.8977890015,42.6446838379)];
    [path addCoordinate:CLLocationCoordinate2DMake(-90.89622497560001,42.6696586609)];
    [path addCoordinate:CLLocationCoordinate2DMake(-90.8959732056,42.6752548218)];
    [path addCoordinate:CLLocationCoordinate2DMake(-90.88994598390001,42.6732940674)];

    GMSPolygon* poly = [GMSPolygon polygonWithPath:path];

    poly.strokeWidth = 2.0;
    poly.strokeColor = [UIColor colorWithRed:0.0 green:0.0 blue:0.0 alpha:1.0];
    poly.fillColor = [UIColor colorWithRed:0.0 green:0.0 blue:0.0 alpha:0.4];
    poly.map = _mapView;        //CRASH!!
}

这是一个回溯:

thread #1: tid = 0x1c03, 0x0010ebde Maps`(anonymous namespace)::PolygonInstance::UpdateEntities(float, gmscore::base::reffed_ptr<gmscore::vector::Camera>, gmscore::renderer::EntityRenderer*, (anonymous namespace)::MarkupBehavior*) + 288, stop reason = EXC_BAD_ACCESS (code=2, address=0x4)
frame #0: 0x0010ebde Maps`(anonymous namespace)::PolygonInstance::UpdateEntities(float, gmscore::base::reffed_ptr<gmscore::vector::Camera>, gmscore::renderer::EntityRenderer*, (anonymous namespace)::MarkupBehavior*) + 288
frame #1: 0x00111f3c Maps`(anonymous namespace)::MarkupBehavior::Commit(gmscore::renderer::EntityRenderer*) + 978
frame #2: 0x0008aad2 Maps`gmscore::renderer::EntityRenderer::Draw(bool) + 634
frame #3: 0x000d6a46 Maps`-[GMSEntityRendererView draw] + 200
frame #4: 0x000d5a85 Maps`-[GMSEntityRendererView displayLinkFired:] + 33
frame #5: 0x00144399 Maps`-[GMSDisplayLink displayLinkFired:] + 351
frame #6: 0x00f9e2d2 QuartzCore`CA::Display::DisplayLink::dispatch(unsigned long long, unsigned long long) + 110
frame #7: 0x00f9e75f QuartzCore`CA::Display::TimerDisplayLink::callback(__CFRunLoopTimer*, void*) + 161
frame #8: 0x02519376 CoreFoundation`__CFRUNLOOP_IS_CALLING_OUT_TO_A_TIMER_CALLBACK_FUNCTION__ + 22
frame #9: 0x02518e06 CoreFoundation`__CFRunLoopDoTimer + 534
frame #10: 0x02500a82 CoreFoundation`__CFRunLoopRun + 1810
frame #11: 0x024fff44 CoreFoundation`CFRunLoopRunSpecific + 276
frame #12: 0x024ffe1b CoreFoundation`CFRunLoopRunInMode + 123
frame #13: 0x038167e3 GraphicsServices`GSEventRunModal + 88
frame #14: 0x03816668 GraphicsServices`GSEventRun + 104
frame #15: 0x012bfffc UIKit`UIApplicationMain + 1211
frame #16: 0x0000298d Maps`main(argc=1, argv=0xbffff3e0) + 141 at main.m:16

我根本没有尝试使用 MapKit。没有创建其他 OpenGL 上下文。任何人都可以为我提供 GMSPolygon 的工作示例吗？我相信我的例子遵循 official example .

使用 SDK 版本 1.3.1。已启用 ARC。使用 Storyboard的单 View 应用程序。平移/缩放其他一切都有效，只是形状绘图无效。

Answer 1

你们有没有找到解决这个问题的方法？我遇到了完全相同的问题，即使逐字使用适用于 iOS 代码的 Google Maps SDK，它仍然会崩溃。它在下面的粗体项目上崩溃:

GMSMutablePath *path = [GMSMutablePath path];
[path addCoordinate:CLLocationCoordinate2DMake(37.36, -122.0)];
[path addCoordinate:CLLocationCoordinate2DMake(37.45, -122.0)];
[path addCoordinate:CLLocationCoordinate2DMake(37.45, -122.2)];
[path addCoordinate:CLLocationCoordinate2DMake(37.36, -122.2)];
[path addCoordinate:CLLocationCoordinate2DMake(37.36, -122.0)];

**GMSPolyline *rectangle = [GMSPolyline polylineWithPath:path];**
rectangle.map = mapView_;

编辑:我找到了解决此问题的方法:

要更正此问题，只需将您当前的代码包装在调度 block 中即可。原因是，Google Maps SDK 要求所有绘图事件都在主线程上完成。下面的代码可以正常工作:

dispatch_async(dispatch_get_main_queue(), ^{
    GMSMutablePath *path = [GMSMutablePath path];
    [path addCoordinate:CLLocationCoordinate2DMake(37.36, -122.0)];
    [path addCoordinate:CLLocationCoordinate2DMake(37.45, -122.0)];
    [path addCoordinate:CLLocationCoordinate2DMake(37.45, -122.2)];
    [path addCoordinate:CLLocationCoordinate2DMake(37.36, -122.2)];
    [path addCoordinate:CLLocationCoordinate2DMake(37.36, -122.0)];

    **GMSPolyline *rectangle = [GMSPolyline polylineWithPath:path];**
    rectangle.map = mapView_;
});