删除/添加注解MapView可以导致内存泄漏 [英] removing/adding annotations to mapview cause memory leaks
本文介绍了删除/添加注解MapView可以导致内存泄漏的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
我一直试图在图形页面摆脱内存泄漏。我使用的自定义地图销类。
一切正常，但问题是 - 我需要过滤的MapView结果。当我删除所有的MapView注释 - 并添加过滤的结果 - 性能工具发现泄漏。但在这个mapPin类我使用的用于自动释放，因此他们应该被释放，但事实并非如此。我究竟做错了什么？
MapPin.h
＃进口＆LT;基金会/ Foundation.h＆GT;
＃进口＆LT; MapKit / MapKit.h＆GT;
＃进口＆LT; MapKit / MKMapView.h＆GT;
＃进口＆LT; MapKit / MKAnnotation.h＆GT;@interface MapPin：NSObject的＆LT; MKAnnotation＆GT; {
CLLocationCoordinate2D协调;
* NSString的图片;
NSInteger的tag_number;
}@属性（非原子，分配）CLLocationCoordinate2D协调;
@属性（非原子，副本）的NSString *称号;
@属性（非原子，副本）的NSString *字幕;
- （ID）initWithCoordinate：（CLLocationCoordinate2D）坐标;
- （ID）initWithCoordinate：（CLLocationCoordinate2D）坐标标题：（* NSString的）称号;
- （ID）initWithCoordinate：（CLLocationCoordinate2D）坐标标题：（* NSString的）标题字幕：（* NSString的）字幕;
- （ID）initWithCoordinate：（CLLocationCoordinate2D）坐标标题：（* NSString的）标题字幕：（* NSString的）字幕图像：（* NSString的）图片;
- （ID）initWithCoordinate：（CLLocationCoordinate2D）坐标标题：（* NSString的）标题字幕：（* NSString的）字幕图像：（* NSString的）PIC编号：（NSInteger的）的数量;
- （无效）setPic：（* NSString的）画面;
- （的NSString *）方法GetPic; - （无效）setNum：（NSInteger的）tag_number;
- （NSInteger的）getNum;@结束
MapPin.m
＃进口MapPin.h
@implementation MapPin@synthesize坐标= _coordinate;
@synthesize标题= _title;
@synthesize字幕= _subtitle;
- （ID）initWithCoordinate：（CLLocationCoordinate2D）坐标
{
返回[自我initWithCoordinate：坐标标题：@];
} - （ID）initWithCoordinate：（CLLocationCoordinate2D）坐标标题：（* NSString的）标题{
返回[自我initWithCoordinate：坐标标题：标题副标题：@];}
- （ID）initWithCoordinate：（CLLocationCoordinate2D）坐标标题：（* NSString的）标题字幕：（* NSString的）字幕{
返回[自我initWithCoordinate：坐标标题：标题字幕：字幕图片：@];} - （ID）initWithCoordinate：（CLLocationCoordinate2D）坐标标题：（* NSString的）标题字幕：（* NSString的）字幕图像：（* NSString的）图片{
MapPin *我= [[[MapPin页头] INIT]自动释放];
me.coordinate =坐标;
me.title =称号;
me.subtitle =字幕; [我setPic：PIC] 还给我;
} - （ID）initWithCoordinate：（CLLocationCoordinate2D）坐标标题：（* NSString的）标题字幕：（* NSString的）字幕图像：（* NSString的）PIC编号：（NSInteger的）数量{
MapPin *我= [[[MapPin页头] INIT]自动释放];
me.coordinate =坐标;
me.title =称号;
me.subtitle =字幕; [我setPic：PIC]
[我setNum：号];
还给我;
} - （无效）setPic：（* NSString的）图片{
照片=图片;
} - （的NSString *）{方法GetPic
返回的画面;
} - （无效）setNum：（NSInteger的）数量{
tag_number =号;} - （NSInteger的）getNum {
返回tag_number;
}@结束
解决方案
我一直用创建人对自定义地图销 MAYUR Birari，我调整了一点点，支持自定义地图销的图像和ID的。
CustomMapPin.h
＃进口＆LT;基金会/ Foundation.h＆GT;
＃进口＆LT; MapKit / MapKit.h＆GT;@interface CustomMapPin：NSObject的＆LT; MKAnnotation＆GT; { CLLocationCoordinate2D协调;
* NSString的称号;
* NSString的字幕; * NSString的图片;
NSInteger的tag_number;}@属性（非原子，分配）CLLocationCoordinate2D协调;
@属性（非原子，副本）的NSString *称号;
@属性（非原子，副本）的NSString *字幕;
@属性（非原子，副本）的NSString *图片;
@属性（非原子）NSInteger的tag_number;
@结束
CustomMapPin.m
＃进口CustomMapPin.h
@implementation CustomMapPin@synthesize称号;
@synthesize字幕;
@synthesize协调;
@synthesize图片;
@synthesize tag_number;
- （无效）的dealloc
{
self.title =零;
self.pic =零;
self.subtitle =零;
[超级的dealloc];
}@结束
和在课堂上使用它是这样的：
CLLocationCoordinate2D pinlocation;
的在一个循环中我设置所需的值并创建地图图钉：的
pinlocation.latitude = ...;pinlocation.longitude = ...;NSInteger的pinID = ....;
CustomMapPin * customMapPin = [[CustomMapPin的alloc]初始化];customMapPin.coordinate =（CLLocationCoordinate2D
{pinlocation.latitude，pinlocation.longitude};customMapPin.title = @称号;customMapPin.subtitle = @副标题;customMapPin.pic = @customImageNamecustomMapPin.tag_number = pinId;
[图形页面addAnnotation：customMapPin];
设置自定义图片：
- （MKAnnotationView *）的MapView：（*的MKMapView）的MapView viewForAnnotation：（ID＆LT; MKAnnotation＆GT;）注释
{
如果（[注解isKindOfClass：[CustomMapPin类]）
{
CustomMapPin * A =注释; [annView setImage：[UIImage的imageNamed：a.pic]];
}
}
上标注获取针ID：
- （空）的MapView：（*的MKMapView），熔点annotationView：（MKAnnotationView *）查看calloutAccessoryControlTapped：（UIControl *）控制
{
CustomMapPin * V =（CustomMapPin *）view.annotation; INT tagNumber = v.tag_number; ....
}
和最后 - 在我的项目它要求有过滤器按钮 - 所以我需要删除所有引脚，并添加所需的。默认情况下调用图形页面删除创建的内存泄漏的所有注释。所以，当我需要清除注释图形页面，我调用这个函数：
- （无效）removeAnnotations
{
NSMutableArray里*的文档，删除= [NSMutableArray的arrayWithCapacity：[mapView.annotations计数]]; 对（在mapView.annotations ID注释）
{
如果（注释！= mapView.userLocation）
{
[文档，删除ADDOBJECT：注释]。
}
} [图形页面removeAnnotations：文档，删除]; 的for（int i = 0; I＆LT;文档，删除计数];我++）
{
CustomMapPin * A = [文档，删除objectAtIndex：i]; [释放]; A =零;
}
}
希望这有助于
编程快乐！ ：）
I've been trying to get rid of memory leaks in mapview. I am using custom map pin class. Everything works, but problem is - I need to filter mapview results. when i remove all mapview annotations - and add filtered results - performance tool finds leaks. but in this mapPin class I am using are used autorelease, so they should be released, but they aren't. what am I doing wrong?
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
MapPin.m
#import "MapPin.h"
@implementation MapPin
@synthesize coordinate = _coordinate;
@synthesize title = _title;
@synthesize subtitle = _subtitle;
- (id) initWithCoordinate:(CLLocationCoordinate2D) coord
{
return [self initWithCoordinate:coord title:@""];
}
- (id) initWithCoordinate:(CLLocationCoordinate2D) coord title:(NSString *) title {
return [self initWithCoordinate:coord title:title subtitle:@""];
}
- (id) initWithCoordinate:(CLLocationCoordinate2D) coord title:(NSString *) title subtitle:(NSString *) subtitle {
return [self initWithCoordinate:coord title:title subtitle:subtitle image:@""];}
- (id) initWithCoordinate:(CLLocationCoordinate2D) coord title:(NSString *) title subtitle:(NSString *) subtitle image:(NSString *) pic{
MapPin * me = [[[MapPin alloc] init] autorelease];
me.coordinate = coord;
me.title = title;
me.subtitle = subtitle;
[me setPic:pic];
return me;
}
- (id) initWithCoordinate:(CLLocationCoordinate2D) coord title:(NSString *) title subtitle:(NSString *) subtitle image:(NSString *) pic num:(NSInteger) number{
MapPin * me = [[[MapPin alloc] init] autorelease];
me.coordinate = coord;
me.title = title;
me.subtitle = subtitle;
[me setPic:pic];
[me setNum:number];
return me;
}
- (void) setPic:(NSString*) pic {
picture = pic;
}
- (NSString * ) getPic{
return picture;
}
- (void) setNum:(NSInteger) number {
tag_number = number;
}
- (NSInteger ) getNum{
return tag_number;
}
@end
解决方案
I have been using cutom map pin created by Mayur Birari, which i tweaked a little bit, to support custom map pin images and id's.
CustomMapPin.h
#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
CustomMapPin.m
#import "CustomMapPin.h"
@implementation CustomMapPin
@synthesize title;
@synthesize subtitle;
@synthesize coordinate;
@synthesize pic;
@synthesize tag_number;
- (void)dealloc
{
self.title = nil;
self.pic = nil;
self.subtitle = nil;
[super dealloc];
}
@end
and using it in class like this:
CLLocationCoordinate2D pinlocation;
in a loop I set up required values and create a map pin:
pinlocation.latitude = ...;
pinlocation.longitude = ...;
NSInteger pinID = ....;
CustomMapPin* customMapPin=[[CustomMapPin alloc] init];
customMapPin.coordinate=(CLLocationCoordinate2D
{pinlocation.latitude,pinlocation.longitude};
customMapPin.title=@"title";
customMapPin.subtitle=@"subtitle";
customMapPin.pic = @"customImageName";
customMapPin.tag_number = pinId;
[mapView addAnnotation:customMapPin];
Setting up custom image:
- (MKAnnotationView *) mapView:(MKMapView *)mapView viewForAnnotation:(id <MKAnnotation>) annotation
{
if ([annotation isKindOfClass: [CustomMapPin class]])
{
CustomMapPin * a = annotation;
[annView setImage:[UIImage imageNamed:a.pic]];
}
}
Getting pin id on callout:
- (void)mapView:(MKMapView *)mp annotationView:(MKAnnotationView *)view calloutAccessoryControlTapped:(UIControl *)control
{
CustomMapPin * v = (CustomMapPin *) view.annotation;
int tagNumber = v.tag_number;
....
}
and finally - in my project It was required to have filter buttons - so I needed to remove all pins, and add required. By default calling mapview to remove all annotations created memory leaks. So when I need to clear mapview from annotations, I call this function:
- (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;
}
}
Hope this helps Happy coding! :)
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