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iPhone MapView 中断

转载 作者:行者123 更新时间:2023-12-03 16:03:12 28 4
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我有一个 mapkit/ View ,它工作正常 - 但我滚动并在 2 - 10 次移动后我的应用程序崩溃了......而且这只是一个“中断”。

这是我的代码的一部分。我认为这是后台线程和数组释放/覆盖问题的问题。

一些背景信息:我在 mapview 启动时生成一个“ session ” key (MapKey)并在服务器端保存一个 pin。 XML 仅包含用于更快响应和更短 XML 的新引脚。

// Update map when the user interacts with it
- (void)mapView:(MKMapView *)aMapView regionDidChangeAnimated:(BOOL)animated
{
MyAnnotation *annotation = [[MyAnnotation alloc] init];
MyAnnotation *ann = [[MyAnnotation alloc] init];
NSUserDefaults *prefs = [NSUserDefaults standardUserDefaults];
[UIApplication sharedApplication].networkActivityIndicatorVisible = YES;
NSString *postBody = [[[NSString alloc] initWithFormat:@"single=0&lat=%f&lng=%f&sid=%@", mapView.centerCoordinate.latitude, mapView.centerCoordinate.longitude, [prefs stringForKey:@"MapKey"], [prefs stringForKey:@"MapKey"]] autorelease];
[self performSelectorInBackground:@selector(getMark:) withObject:postBody];
}
// make post and interact with verarbeiten
-(void) getMark:(NSString *)postBody
{
NSAutoreleasePool *ccpool = [[NSAutoreleasePool alloc] init];
NSString *urlStr = [[[NSString alloc] initWithFormat:@"http://URL/get.php"] autorelease];
NSMutableURLRequest *request;
NSData *postData = [postBody dataUsingEncoding:NSUTF8StringEncoding];
NSError *error;
NSURLResponse *response;
NSData *dataReply;
id stringReply;

request = [NSMutableURLRequest requestWithURL: [NSURL URLWithString:urlStr]];

[request setHTTPMethod: @"POST"];
[request setHTTPBody:postData];
[request setValue:@"text/xml" forHTTPHeaderField:@"Accept"];

dataReply = [NSURLConnection sendSynchronousRequest:request returningResponse:&response error:&error];
stringReply = (NSString *)[[[NSString alloc] initWithData:dataReply encoding:NSUTF8StringEncoding] autorelease];
[self performSelectorInBackground:@selector(verarbeiten:) withObject:stringReply];

[ccpool release];
}

//generate annotations array with annotations an set it to mapview
-(void) verarbeiten:(NSString *)stringReply
{
NSAutoreleasePool *bbpool = [[NSAutoreleasePool alloc] init];
CXMLDocument *rssParser = [[[CXMLDocument alloc] initWithXMLString:stringReply options:0 error:nil] autorelease];
NSMutableArray* annotations = [[NSMutableArray alloc] init];
NSArray *resultNodes = nil;
resultNodes = nil;
resultNodes = [rssParser nodesForXPath:@"//place" error:nil];
for (CXMLElement *resultElement in resultNodes)
{
MyAnnotation *ann = [[MyAnnotation alloc] init];
ann.title = [[resultElement childAtIndex:3] stringValue];
ann.subtitle = [[resultElement childAtIndex:5] stringValue];
ann.currentPoint = [NSNumber numberWithInt:[[[resultElement childAtIndex:1] stringValue] intValue]];
MKCoordinateRegion region = { {0.0, 0.0 }, { 0.0, 0.0 } };
region.center.latitude = [[[resultElement childAtIndex:9] stringValue] floatValue];
region.center.longitude = [[[resultElement childAtIndex:7] stringValue] floatValue];
ann.coordinate = region.center;
//[mapView addAnnotation:ann ];

[annotations addObject:ann];
}
[mapView addAnnotations:annotations ];
[annotations release];
[UIApplication sharedApplication].networkActivityIndicatorVisible = NO;
[bbpool release];
}

- (MKAnnotationView *) mapView:(MKMapView *)mV viewForAnnotation:(MyAnnotation *) annotation

{
MKPinAnnotationView *pinView = nil;
if(annotation != mapView.userLocation)
{
static NSString *defaultPinID = @"de.my.pin";
pinView = (MKPinAnnotationView *)[mapView dequeueReusableAnnotationViewWithIdentifier:defaultPinID];
if ( pinView == nil )
pinView = [[[MKPinAnnotationView alloc] initWithAnnotation:annotation reuseIdentifier:defaultPinID] autorelease];

pinView.pinColor = MKPinAnnotationColorRed;
pinView.canShowCallout = YES;
pinView.animatesDrop = NO;
pinView.userInteractionEnabled = YES;
UIButton *btnVenue = [UIButton buttonWithType:UIButtonTypeDetailDisclosure];
btnVenue.tag = [annotation.currentPoint intValue];
[btnVenue addTarget:self action:@selector(showLinks:) forControlEvents:UIControlEventTouchUpInside];
pinView.rightCalloutAccessoryView = btnVenue;
}
else
{
[mapView.userLocation setTitle:@"You are here"];
}

return pinView;
}



#import "MyAnnotation.h"


@implementation MyAnnotation

@synthesize coordinate, title, subtitle,currentPoint;

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

@end



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

@interface MyAnnotation : NSObject <MKAnnotation>
{
CLLocationCoordinate2D coordinate;
NSString *title;
NSString *subtitle;
NSNumber *currentPoint;
}

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

@end

最佳答案

只是一个想法:由于 -[MKMapView addAnnotations:] (可能)执行 UI 修改,您可能希望在主线程中调用它:

[mapView performSelectorOnMainThread: @selector(addAnnotations:) withObject: annotations waitUntilDone: YES];

关于iPhone MapView 中断,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/1995245/

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