IOS - Mapkit崩溃 - 这是xcode 4.2和自动引用计数（ARC）中的错误吗？ [英] IOS - Mapkit crash - Is it a bug in xcode 4.2 and Automatic Reference Counting (ARC)?

问题描述

我在MKMapView中发现了一个非常严重的问题，我认为这可能是新的xcode 4.2和ARC（自动引用计数）中的一个错误。

I have found a very wierd problem in MKMapView that i think might be a bug in the new xcode 4.2 and ARC (Automatic Reference Count).

非常基本的UIViewController类：MapViewController，它实现了协议：

I created a very basic UIViewController class: MapViewController, that implements the protocol :

#import <UIKit/UIKit.h>
#import <MapKit/MapKit.h>
#import <CoreLocation/CoreLocation.h>
@interface MapViewController : UIViewController <MKMapViewDelegate>
@property (strong, nonatomic) IBOutlet MKMapView *mapView;

我使用xib文件来实例化mapview并链接到它的委托，即First Responder。

I use a xib file to instantiate the mapview and link to its delegate i.e First Responder.

除了UIViewController继承的自动生成方法之外，没有任何内容添加到m文件。

Nothing is added to the m file, except the autogenerated methods inherited by UIViewController.

MapViewController实例化如下： / p>

The MapViewController is instantiated like:

MapViewController *mapView = [[MapViewController alloc]init];
[self.view addSubview:mapView.view];

因此，当加载mapview并滚动地图或放大/缩小时，程序崩溃。
主程序将与一个EXE_BAD_ACCESS崩溃，意味着它正在访问非法内存。

So the program crash when the mapview is loaded and you scroll the map or zoom in/out. Main will crash with a EXE_BAD_ACCESS, meaning it is accessing illegal memory.

我用仪器配置它并检查僵尸，结果是mapview overrleases一个对象，它崩溃 - 如img中所示。

I Profiled it with instruments and checked for Zombies, and it turns out that the mapview overreleases an object and it crashes - as seen in the img.

！[Zombie log] [1]

![The Zombie log][1]

我不认为我做错了，所以我想知道，如果你有任何一个解决方案的想法或想测试，如果你可以重现相同的结果。
我的下一步是在没有ARC的新项目中测试，看看是否改变了这个问题。

I do not think i do something wrong, so i would like to know if any of you might have a solution idea or want to test if you can reproduce the same result. My next step would be to test in a new project without ARC to see if that changes the problem.

系统信息：
Xcode 4.2 Build 4D199使用ARC - >自动引用计数

System info: Xcode 4.2 Build 4D199 using ARC -> Automatic reference counting

在Simulator for IOS 4.3中测试的应用程序

App tested in Simulator for IOS 4.3

推荐答案

对我来说完美无缺。您是否已将 MapKit.framework 链接到您的目标？

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