Question

我对GMSPolygon对象有一个非常奇怪的问题。我的代码突然崩溃，错误＆＃34;无法识别的选择器发送到实例0x ....＆＃34;

（是的，它整天都在工作，突然间它开始崩溃）

我正在使用多边形数组（以跟踪它们并动态更新它们）并在我的-viewDidLoad中按如下方式初始化它们：

GMSPolygon *myPoly[50];

-

GMSMutablePath *path = [[GMSMutablePath alloc] init];
// set some fake coordinates, initializing a Polygon with an empty path seems to crash as well...

[path addCoordinate:CLLocationCoordinate2DMake(1,0)];
[path addCoordinate:CLLocationCoordinate2DMake(-1,0)];
[path addCoordinate:CLLocationCoordinate2DMake(0,1)];

for (int i=0;i<50;i++) {
    myPoly[i] = [GMSPolygon  polygonWithPath:path];
    myPoly[i].map = nil;
}

稍后在我的程序中，我尝试以相同的方式再次访问该对象，首先将其设置为nil，以便将其从地图中删除，然后更新并在必要时再次显示

for (int i=0;i<50;i++) {
    myPoly[i] = [GMSPolygon  polygonWithPath:path];
    myPoly[i].map = nil;  <--------- CRASH 


    // Do other stuf here, update the Polygon data and if needed
    // display again as follows:
    myPoly[i].map = mapView_;

}

但似乎崩溃了...... 如果我将GMSPolygon放在NSMutable数组中，也会发生同样的事情。初始化数组很好，但是将GMSPolygon从数组中取出并设置.map属性会导致同样的崩溃。

更新：

它似乎是由对象Memory位置引起的。如果它工作正常，内存位置如下：

[0] GMSPolygon * 0x1558ed750 0x00000001558ed750＆lt; --- viewDidLoad for-loop

[0] GMSPolygon * 0x1558ed750 0x00000001558ed750＆lt; ---其他函数for-loop

崩溃时

[0] GMSPolygon * 0x12e7cbf30 0x000000012e7cbf30＆lt; --- viewDidLoad for-loop

[0] GMSPolygon * 0x129d36630 0x0000000129d36630＆lt; ---其他函数for-loop

该对象仅在viewDidLoad中初始化一次，其他地方都没有！它显然解释了如果对象内存位置不同的崩溃......但是这里发生了什么？

任何人都知道为什么？

更新2，现在收到崩溃日志：

2016-04-14 15:16:49.618 myApp[1130:240689] -[GMSMutablePath setMap:]: unrecognized selector sent to instance 0x1540bb560
2016-04-14 15:16:49.627 myApp[1130:240689] void uncaughtExceptionHandler(NSException *__strong) [Line 354] CRASH: -[GMSMutablePath setMap:]: unrecognized selector sent to instance 0x1540bb560
2016-04-14 15:16:49.688 myApp[1130:240689] void uncaughtExceptionHandler(NSException *__strong) [Line 355] Stack Trace: (
0   CoreFoundation                      0x0000000182ebee50 <redacted> + 148
1   libobjc.A.dylib                     0x0000000182523f80 objc_exception_throw + 56
2   CoreFoundation                      0x0000000182ec5ccc <redacted> + 0
3   CoreFoundation                      0x0000000182ec2c74 <redacted> + 872
4   CoreFoundation                      0x0000000182dc0d1c _CF_forwarding_prep_0 + 92
5   myApp                               0x00000001001115a0 -[mapViewController plotPoly] + 2028
6   myApp                               0x000000010012c944 -[mapViewController mapView:didChangeCameraPosition:] + 556
7   CoreFoundation                      0x0000000182ec4ae0 <redacted> + 144
8   CoreFoundation                      0x0000000182dbc548 <redacted> + 284
9   CoreFoundation                      0x0000000182dc0e70 <redacted> + 60
10  myApp                              0x0000000100203370 -[GMSDelegateForward forwardInvocation:] + 108
11  CoreFoundation                      0x0000000182ec2aa4 <redacted> + 408
12  CoreFoundation                      0x0000000182dc0d1c _CF_forwarding_prep_0 + 92
13  myApp                               0x0000000100188fec -[GMSMapView updateWithCamera:] + 176
14  Foundation                          0x0000000183893ffc <redacted> + 340
15  CoreFoundation                      0x0000000182e75124 <redacted> + 24
16  CoreFoundation                      0x0000000182e74bb8 <redacted> + 540
17  CoreFoundation                      0x0000000182e728b8 <redacted> + 724
18  CoreFoundation                      0x0000000182d9cd10 CFRunLoopRunSpecific + 384
19  GraphicsServices                    0x0000000184684088 GSEventRunModal + 180
20  UIKit                               0x0000000188069f70 UIApplicationMain + 204
21  myApp                               0x000000010013dd3c main + 124
22  libdyld.dylib                       0x000000018293a8b8 <redacted> + 4)

2016-04-14 15:16:49.700 myApp[1130:240689] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[GMSMutablePath setMap:]: unrecognized selector sent to instance 0x1540bb560'
*** First throw call stack:
(0x182ebee38 0x182523f80 0x182ec5ccc 0x182ec2c74 0x182dc0d1c 0x1001115a0     
0x10012c944 0x182ec4ae0 0x182dbc548 0x182dc0e70 0x100203370 0x182ec2aa4 
0x182dc0d1c 0x100188fec 0x183893ffc 0x182e75124 0x182e74bb8 0x182e728b8 
0x182d9cd10 0x184684088 0x188069f70 0x10013dd3c 0x18293a8b8)
libc++abi.dylib: terminating with uncaught exception of type NSException

我现在惊呆了。初始初始化工作正常，多边形被绘制为应该，但是一旦我调用函数重绘多边形，崩溃发生..并且很奇怪现在我知道为什么它崩溃了，但我不明白..它将前5个阵列条目更改为GMSMutablePath和GMSPolyLine，而不是GMSPolygon？！，请参见下面的链接 ..并且不知道为什么，因为我100％肯定平均时间内其他任何地方都没有触及GMSPolygon数组。

Picture of of change in Array type

Answer 1

由于我的声誉，我无法发表评论。就像Dan所说，使用 NSArray 或 NSMutableArray 来存储您的对象。然后做你的东西。

更新：以下是我的建议：

将所有例外添加到断点导航器中。
尝试不用循环测试代码。
尝试添加浮点值作为坐标。

请参阅下面的示例代码：

GMSMutablePath *prettyPoly = [GMSMutablePath path];
[prettyPoly addCoordinate:CLLocationCoordinate2DMake(52.506191, 1.83197)];
[prettyPoly addCoordinate:CLLocationCoordinate2DMake(52.05249, 1.650696)];
[prettyPoly addCoordinate:CLLocationCoordinate2DMake(51.92225, 1.321106)];
[prettyPoly addCoordinate:CLLocationCoordinate2DMake(51.996719, 1.219482)];
[prettyPoly addCoordinate:CLLocationCoordinate2DMake(52.049112, 1.244202)];
[prettyPoly addCoordinate:CLLocationCoordinate2DMake(52.197507, 1.334839)];
[prettyPoly addCoordinate:CLLocationCoordinate2DMake(52.519564, 1.801758)];

GMSPolygon *polygon = [GMSPolygon polygonWithPath: prettyPoly];
polygon.fillColor = [UIColor colorWithRed:0 green:0.25 blue:0 alpha:0.3];
polygon.strokeColor = [UIColor greenColor];
polygon.strokeWidth = 5;
polygon.map = self.googleMap;

如果一切都失败了： - 请参阅此文档：https://developers.google.com/maps/documentation/ios-sdk/reference/interface_g_m_s_polygon#properties

您如何尝试使用Polyline课程并查看此示例：https://developers.google.com/maps/documentation/ios-sdk/shapes#add_a_polyline
最后，尝试从Google论坛或您正在使用的图书馆的回购中寻求帮助。

GMSPolygon数组iOS崩溃

1 个答案: