ios – JSONModel中的NSMutableDictionary – EXC_BAD_ACCESS KERN_INVALID_ADDRESS

Crashlytics在我的一个应用程序中报告了这个崩溃,我无法重现它,无论我做什么.
大约有5％的用户发生这种情况,所以这是一件很大的事情.
我正在发布崩溃报告的屏幕截图以及崩溃报告中提到的方法.
任何想法如何解决这个问题？

这是应用程序崩溃的地方：

#pragma mark - custom transformations
-(BOOL)__customSetValue:(id<NSObject>)value forProperty:(JSONModelClassproperty*)property
{
    if (!property.customSetters)
        property.customSetters = [NSMutableDictionary new];

    Nsstring *className = NsstringFromClass([JSONValueTransformer classByResolvingClusterClasses:[value class]]);

    if (!property.customSetters[className]) {
        //check for a custom property setter method
        Nsstring* ucfirstName = [property.name stringByReplacingCharactersInRange:NSMakeRange(0,1)
                                                                       withString:[[property.name substringToIndex:1] uppercaseString]];
        Nsstring* selectorName = [Nsstring stringWithFormat:@"set%@With%@:",ucfirstName,className];

        SEL customPropertySetter = NSSelectorFromString(selectorName);

        //check if there's a custom selector like this
        if (![self respondsToSelector: customPropertySetter]) {
            property.customSetters[className] = [NSNull null]; // this is line 855
            return NO;
        }

        //cache the custom setter selector
        property.customSetters[className] = selectorName;
    }

    if (property.customSetters[className] != [NSNull null]) {
        //call the custom setter
        //https://github.com/steipete
        SEL selector = NSSelectorFromString(property.customSetters[className]);
        ((void (*) (id,SEL,id))objc_msgSend)(self,selector,value);
        return YES;
    }

    return NO;
}

这是始发方法：

-(void)reloadUserInfoWithCompletion:(void (^) (Loginobject *response))handler andFailure:(void (^)(NSError *err))failureHandler {
    Nsstring *lat;
    Nsstring *lon;

    lat = [Nsstring stringWithFormat:@"%.6f",[[LocationManager sharedInstance] getPosition].coordinate.latitude];
    lon = [Nsstring stringWithFormat:@"%.6f",[[LocationManager sharedInstance] getPosition].coordinate.longitude];

    NSMutableDictionary *params = [NSMutableDictionary new];
    [params setobject:lat forKey:@"latitude"];
    [params setobject:lon forKey:@"longitude"];

    [[LoginHandler sharedInstance] getLoginToken:^(Nsstring *response) {

        NSDictionary *headers;
        if (response) {
            headers = @{@"Login-Token":response};
        }
        GETRequest *req = [GETRequest new];
        [req setCompletionHandler:^(Nsstring *response) {
            dispatch_async(dispatch_get_global_queue(disPATCH_QUEUE_PRIORITY_DEFAULT,0),^{
                NSLog(@"response: %@",response);
                NSError *err = nil;
                self.loginobject.userDetails = [[User alloc] initWithString:response error:&err]; // <- this is the line reported in the crash
                [self storeLoginobject];
                NSLog(@"%@",self.loginobject.userDetails);
//                [Utils updatefiltersFullAccessIfAll]; 
                dispatch_async(dispatch_get_main_queue(),^{
                    if (handler) {
                        handler(self.loginobject);
                    }
                });
            });
        }];
        [req setFailedHandler:^(NSError *err) {
            if (failureHandler) {
                failureHandler(err);
            }
        }];
        NSLog(@"%@",params);
        [req requestWithLinkString:USER_DETAILS parameters:nil andHeaders:headers];
    }];

}

解决方法

所以setobject：forKey：可以通过两种方式引起问题. 1.如果对象为零或2.键为零.两者都可能导致您看到的崩溃.鉴于您将对象设置为[NSNull null],假设它是提供问题的关键,可能是安全的(在第855行).

从那里回来,会显示className是零.如果你看,你的代码不能防止这种情况.你在这里假设NsstringFromClass(之前的两行)给你一个有效的字符串,它假定原来传递给该方法的值是非零的.如果它是零,它将使它通过所有的检查,包括！property.customSetters [className],因为这将是！nil允许它进入if.

如果我正在阅读你的代码(有点困难,因为我无法测试任何我的假设)NSLog(@“response：％@”,response);将打印出一个零回应.

尝试看看你的代码如何处理这些意想不到的尼尔,让我知道如何做的事情.