1
我煮了一组非常复杂的Web服务,并搜索到简单的下面的代码。 我需要能够向地图添加注释以响应搜索(或者在下面的示例中点击按钮),然后允许用户再次单击该按钮并获得一组新结果。实际上会有不同的数字,但在简单的例子中,我们总是在mapview中添加一个注释。 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,但是在第二个按钮和随后的按钮按下时会泄漏32个字节。 我错过了什么? (或保留视情况而定!)删除MKMapView注释导致泄漏
testViewController.h
#import <UIKit/UIKit.h> #import <MapKit/MapKit.h> #import "MyMark.h" @interface testViewController : UIViewController { MKMapView *mapView; } @end
testViewController.m
- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil { if (self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil]) { // Custom initialization [email protected]"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]; }
MyMark.h
#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
MyMark.m
#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]; }
OMG你是对的。自拍头。挺难的。 – Andiih 2009-10-01 08:19:48