关于ios：删除MKMapView注释会导致泄漏

Removing MKMapView Annotations causes leaks

我将一组非常复杂的Web服务和搜索归结为简单的以下代码。我需要能够在地图中添加注释以响应搜索(或者在下面的示例中单击按钮)，然后允许用户再次单击按钮并获得一组新的结果。实际上会有一个不同的数字，但是在这个简化的示例中，我们总是向地图视图添加一个注释。我相信我的代码应该删除现有的注释并添加一个新的注释，但是它会在第二次和随后的按钮按下时泄漏32个字节。我错过了什么？(或视情况保留！)

测试视图控制器.h

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#import <UIKit/UIKit.h>
#import <MapKit/MapKit.h>
#import"MyMark.h"

@interface testViewController : UIViewController {
MKMapView *mapView;
}

@end

测试视图控制器.m

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- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil {
if (self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil]) {
// Custom initialization
self.title=@"test";
}
return self;
}

- (void) storeLocationInfo: (CLLocationCoordinate2D) loc title:(NSString *)t subtitle:(NSString *)st index:(int)i {
NSArray * annotations = [mapView annotations];
[mapView removeAnnotations:annotations];

MyMark * mymark=[[MyMark alloc] initWithCoordinate:loc];
[mapView addAnnotation:mymark];
[MyMark release];
}

- (void)viewDidLoad {
[super viewDidLoad];
UIBarButtonItem *barButton = [[UIBarButtonItem alloc] initWithTitle:@"Add point to map" style:UIBarButtonItemStylePlain target:self action:@selector(addPushed)];
[self.navigationItem setRightBarButtonItem:barButton];
[barButton release];

mapView=[[MKMapView alloc] initWithFrame:CGRectMake(0.0,0.0,self.view.frame.size.width,self.view.frame.size.height)];
mapView.showsUserLocation=FALSE;
mapView.delegate=self;
[self.view insertSubview:mapView atIndex:0];
[mapView release];
}

- (void) addPushed {
MKCoordinateRegion reg = mapView.region;
[self storeLocationInfo:reg.center title:@"price" subtitle:@"title" index:1];
}

- (void)dealloc {
[super dealloc];
}

麦克马克

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

@interface MyMark : NSObject<MKAnnotation> {
CLLocationCoordinate2D coordinate;
NSString * title;
NSString * subtitle;
int index;
}
@property (nonatomic, readonly) CLLocationCoordinate2D coordinate;
@property (nonatomic, readonly) int index;
@property (nonatomic, retain) NSString * title;
@property (nonatomic, retain) NSString * subtitle;
-(id)initWithCoordinate:(CLLocationCoordinate2D) coordinate;
-(id)setCoordinate:(CLLocationCoordinate2D) coordinate;
-(id)setTitle:(NSString *)t subtitle:(NSString *)st index:(int)i ;

@end

迈克马克

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#import"MyMark.h"

@implementation MyMark
@synthesize coordinate, index;
@synthesize title,subtitle;

-(id)initWithCoordinate:(CLLocationCoordinate2D) c{
coordinate=c;
NSLog(@"%f,%f",c.latitude,c.longitude);
return self;
}

-(id)setCoordinate:(CLLocationCoordinate2D) c{
coordinate=c;
NSLog(@"%f,%f",c.latitude,c.longitude);
return self;
}

-(id)setTitle:(NSString *)t subtitle:(NSString *)st index:(int) i{
self.title=t;
self.subtitle=st;
index=i;
return self;
}

-(void) dealloc {
[title release];
[subtitle release];
[super dealloc];
}

你不会在storeLocationInfo:title:subtitle:index:中释放mymark。看起来问题是输入错误。一行字

1	[MyMark release];

应该是

1	[MyMark release];

注意大小写的区别。第一行将release发送到类，而不是实例。