Question

我在自己的代码中获得了EXC_BAD_ACCESS。目前，我的代码通过shareURLCache对象获取URL，然后启动url连接。一旦我离开启动url连接的方法，我就点击了EXC_BAD_ACCESS。我已经尝试使用仪器找到任何僵尸，我已经分析了内存泄漏，也没有出现。此时我完全卡住了。

以下是加载网址并启动网址连接的代码

- (void)locationManager:(CLLocationManager *)manager 
didUpdateToLocation:(CLLocation *)newLocation 
       fromLocation:(CLLocation *)oldLocation
{
    NSLog(@"At new location: %@",newLocation);

    MKCoordinateRegion region = 
            MKCoordinateRegionMakeWithDistance([newLocation coordinate], 750, 750);

    [mapView setRegion:region animated:YES];
    [location stopUpdatingLocation];

    CLLocationCoordinate2D coord = [newLocation coordinate];
    NSURL *url = [urlCache getReccomendationForUID:@"12345" atLat:coord.latitude 
                                         atLon:coord.longitude forCategories:nil];


    // Create the request.
    NSURLRequest *request = [NSURLRequest requestWithURL:url
                                         cachePolicy:NSURLRequestUseProtocolCachePolicy
                                     timeoutInterval:60.0];


// create the connection with the request
// and start loading the data
    connection = [[NSURLConnection alloc] initWithRequest:request delegate:self startImmediately:YES];
    if (connection) {
        // Create the NSMutableData to hold the received data.
        // xmlData is an instance variable declared elsewhere.
        xmlData = [[NSMutableData alloc]init];
    } else {
        NSLog(@"Could not create connection");
    }
}

来自sharedURLCache的返回url

的方法

-(NSURL *)getReccomendationForUID:(NSString *)u atLat:(double)lat atLon:(double)lon forCategories:(NSArray *)cat
{
    if(remote) {
        NSMutableString *categories = [[NSMutableString alloc]init];
        for(NSString *s in cat) {
            [categories appendString:@"&cat="];
            [categories appendString:s];
        }
        NSString *s = [NSString stringWithFormat:@"%@/recommendation?uid=%@&psw=null&lat=%f&lon=%f?%@",
                   apiRoot,u,lat,lon,categories];
        [categories release];
        return [NSURL URLWithString:s];
    } else {
        return [[NSBundle mainBundle] URLForResource:@"XMLTest" withExtension:@"xml"];;
    }
}

Answer 1

首先注释掉代码并运行以查看是否可以让mem错误消失，然后再次开始添加代码直到它出现，然后您就可以更好地了解问题所在。它可能在你的代码中的任何地方，因为你似乎有许多没有传入的对象，例如'位置'。

[location stopUpdatingLocation];

Answer 2

我的内存问题与

相同

[mapView setRegion:region animated:YES];

此方法不喜欢快速更新...

iphone和模拟器上的EXC_BAD_ACCESS问题

2 个答案: