Iphone 删除/向mapview添加注释会导致内存泄漏

我一直在试图消除mapview中的内存泄漏。我正在使用自定义地图pin类。 一切正常，但问题是-我需要过滤mapview结果。当我删除所有mapview注释并添加过滤结果时，性能工具会发现漏洞。但是在这个mapPin类中，我使用的是autorelease，所以它们应该被释放，但它们不是。我做错了什么

MapPin.h

#import <Foundation/Foundation.h>
#import <MapKit/MapKit.h>
#import <MapKit/MKMapView.h>
#import <MapKit/MKAnnotation.h>

@interface MapPin : NSObject<MKAnnotation> {
    CLLocationCoordinate2D coordinate;
    NSString * picture;
    NSInteger tag_number;
}

@property (nonatomic,assign) CLLocationCoordinate2D coordinate;
@property (nonatomic, copy) NSString *title;
@property (nonatomic, copy) NSString *subtitle;


- (id) initWithCoordinate:(CLLocationCoordinate2D) coord;
- (id) initWithCoordinate:(CLLocationCoordinate2D) coord title:(NSString *) title;
- (id) initWithCoordinate:(CLLocationCoordinate2D) coord title:(NSString *) title subtitle:(NSString *) subtitle;
- (id) initWithCoordinate:(CLLocationCoordinate2D) coord title:(NSString *) title subtitle:(NSString *) subtitle image:(NSString *) pic;
- (id) initWithCoordinate:(CLLocationCoordinate2D) coord title:(NSString *) title subtitle:(NSString *) subtitle image:(NSString *) pic num:(NSInteger) number;
- (void) setPic:(NSString *) picture;
- (NSString* ) getPic;

- (void) setNum:(NSInteger) tag_number;
- (NSInteger ) getNum;

@end

#import <Foundation/Foundation.h>
#import <MapKit/MapKit.h>

@interface CustomMapPin : NSObject<MKAnnotation> {

    CLLocationCoordinate2D  coordinate;
    NSString*               title;
    NSString*               subtitle;

    NSString*               pic;
    NSInteger               tag_number;

}

@property (nonatomic, assign)   CLLocationCoordinate2D  coordinate;
@property (nonatomic, copy)     NSString*               title;
@property (nonatomic, copy)     NSString*               subtitle;
@property (nonatomic, copy)     NSString*               pic;
@property (nonatomic)           NSInteger               tag_number;


@end

---

我一直在使用由Mayur Birari创建的cutom map pin，来支持自定义地图pin图像和id

CustomMapPin.h

#import <Foundation/Foundation.h>
#import <MapKit/MapKit.h>
#import <MapKit/MKMapView.h>
#import <MapKit/MKAnnotation.h>

@interface MapPin : NSObject<MKAnnotation> {
    CLLocationCoordinate2D coordinate;
    NSString * picture;
    NSInteger tag_number;
}

@property (nonatomic,assign) CLLocationCoordinate2D coordinate;
@property (nonatomic, copy) NSString *title;
@property (nonatomic, copy) NSString *subtitle;


- (id) initWithCoordinate:(CLLocationCoordinate2D) coord;
- (id) initWithCoordinate:(CLLocationCoordinate2D) coord title:(NSString *) title;
- (id) initWithCoordinate:(CLLocationCoordinate2D) coord title:(NSString *) title subtitle:(NSString *) subtitle;
- (id) initWithCoordinate:(CLLocationCoordinate2D) coord title:(NSString *) title subtitle:(NSString *) subtitle image:(NSString *) pic;
- (id) initWithCoordinate:(CLLocationCoordinate2D) coord title:(NSString *) title subtitle:(NSString *) subtitle image:(NSString *) pic num:(NSInteger) number;
- (void) setPic:(NSString *) picture;
- (NSString* ) getPic;

- (void) setNum:(NSInteger) tag_number;
- (NSInteger ) getNum;

@end

#import <Foundation/Foundation.h>
#import <MapKit/MapKit.h>

@interface CustomMapPin : NSObject<MKAnnotation> {

    CLLocationCoordinate2D  coordinate;
    NSString*               title;
    NSString*               subtitle;

    NSString*               pic;
    NSInteger               tag_number;

}

@property (nonatomic, assign)   CLLocationCoordinate2D  coordinate;
@property (nonatomic, copy)     NSString*               title;
@property (nonatomic, copy)     NSString*               subtitle;
@property (nonatomic, copy)     NSString*               pic;
@property (nonatomic)           NSInteger               tag_number;


@end

在课堂上使用它，就像这样：

CLLocationCoordinate2D pinlocation;

在一个循环中，我设置了所需的值并创建了一个映射接点：

设置自定义映像：

- (MKAnnotationView *) mapView:(MKMapView *)mapView viewForAnnotation:(id <MKAnnotation>) annotation
{
    if ([annotation isKindOfClass: [CustomMapPin class]]) 
    {
        CustomMapPin * a = annotation;

        [annView setImage:[UIImage imageNamed:a.pic]];
    }
}

最后，在我的项目中，它需要有过滤器按钮，所以我需要删除所有的引脚，并添加所需的。默认情况下，调用mapview以删除由内存泄漏创建的所有注释。因此，当我需要从注释中清除mapview时，我调用此函数：

- (void)removeAnnotations
{
    NSMutableArray *toRemove = [NSMutableArray arrayWithCapacity:[mapView.annotations count]];

    for (id annotation in mapView.annotations)
    {
        if (annotation != mapView.userLocation)
        {
            [toRemove addObject:annotation];
        }
    }

    [mapView removeAnnotations:toRemove];

    for(int i = 0; i < [toRemove count]; i++)
    {
        CustomMapPin * a = [toRemove objectAtIndex:i];

        [a release];

        a = nil;
    }
}

-（无效）删除注释
{
NSMutableArray*toRemove=[NSMutableArray阵列容量：[mapView.annotations count]]；
用于（mapView.annotations中的id注释）
{
if（注释！=mapView.userLocation）
{
[删除添加对象：注释]；
}
}
[地图视图删除说明：删除]；
对于（int i=0；i<[toRemove count]；i++）
{
CustomMapPin*a=[toRemove objectAtIndex:i]；
[释放]；
a=零；
}
}

希望这有帮助

---

快乐编码！：）

您刚刚错过了dealloc实现

例如：

- (void)dealloc 
{
    [self.title release];

    self.title = nil;

    self.subtitle release];

    self.subtitle = nil;

    [super dealloc];
}

---

我没有看到任何dealloc方法实现。你在使用ARC吗？没有ARC，只是在互联网上找到了这个代码，从那时起就一直在使用这个类。刚刚决定测试内存泄漏。您确定在从映射中删除所有注释后可以进行[发布]吗？这不是自动发布注释吗？

- (void)removeAnnotations
{
    NSMutableArray *toRemove = [NSMutableArray arrayWithCapacity:[mapView.annotations count]];

    for (id annotation in mapView.annotations)
    {
        if (annotation != mapView.userLocation)
        {
            [toRemove addObject:annotation];
        }
    }

    [mapView removeAnnotations:toRemove];

    for(int i = 0; i < [toRemove count]; i++)
    {
        CustomMapPin * a = [toRemove objectAtIndex:i];

        [a release];

        a = nil;
    }
}

- (void)dealloc 
{
    [self.title release];

    self.title = nil;

    self.subtitle release];

    self.subtitle = nil;

    [super dealloc];
}