当我点击一个注释时，它会向我显示那个不是我的情况的小窗口，注释在这里，但是当我点击一个应用程序抛出异常时，我认为这个代码会产生问题：< / p>
for (int i=0; i<[array count]; i++) {
NSDictionary *stationEnCours=[array objectAtIndex:i];
NSString *distance=[stationEnCours objectForKey:@"distance"];
float lng = [[stationEnCours objectForKey:@"ssiphone_longitude"] floatValue];
float lat = [[stationEnCours objectForKey:@"ssiphone_latitude"] floatValue];
NSString *ensStation=[stationEnCours objectForKey:@"ssiphone_enseigne"];
location2D = (CLLocationCoordinate2D){ .latitude = lat, .longitude = lng };
MyLocation *annotation=[[[MyLocation alloc]initWithName:ensStation distanceVersLaStation:distance coordinate:location2D]autorelease];
[mapView addAnnotation:annotation];
MKCoordinateSpan span={latitudeDelta:0.2,longitudeDelta:0.2};
MKCoordinateRegion region={location2D,span};
[mapView setRegion:region];
[self.view addSubview:mapView];
}
对于实现MKAnnotation协议的MyLocation类，我有这个：
@implementation MyLocation
@synthesize enseigneDeLaStation=_enseigneDeLaStation;
@synthesize distanceVersLaStation=_distanceVersLaStation;
@synthesize coordinate=_coordinate;
-(id)initWithName:(NSString *)enseigneDeLaStation distanceVersLaStation:(NSString *) distanceVersLaStation coordinate:(CLLocationCoordinate2D)coordinate
{
if ((self = [super init])) {
_enseigneDeLaStation = [enseigneDeLaStation copy];
_distanceVersLaStation = [distanceVersLaStation copy];
_coordinate = coordinate;
}
return self;
}
- (NSString *)title {
return _enseigneDeLaStation;
}
- (NSString *)subtitle {
return _distanceVersLaStation;
}
- (void)dealloc
{
[_enseigneDeLaStation release];
_enseigneDeLaStation = nil;
[_distanceVersLaStation release];
_distanceVersLaStation = nil;
[super dealloc];
}
@end
请提前帮助：）））
修改 @Anna：我已经解决了你提到的问题，但我仍有同样的问题：
for (int i=0; i<[array count]; i++) {
//afficher sur la carte (map)
NSDictionary *stationEnCours=[array objectAtIndex:i];
//NSString *adresseStation=[stationEnCours objectForKey:@"ssiphone_adresse"];
//float distance = [[stationEnCours objectForKey:@"distance"] floatValue];
NSString *distance=[stationEnCours objectForKey:@"distance"];
NSLog(@"distance: %.1f",distance);
float lng = [[stationEnCours objectForKey:@"ssiphone_longitude"] floatValue];
float lat = [[stationEnCours objectForKey:@"ssiphone_latitude"] floatValue];
NSString *ensStation=[stationEnCours objectForKey:@"ssiphone_enseigne"];
//CLLocationCoordinate2D location2D= {.latitude = lat, .longitude = lng};
location2D = (CLLocationCoordinate2D){ .latitude = lat, .longitude = lng };
MyLocation *annotation=[[[MyLocation alloc]initWithName:ensStation distanceVersLaStation:distance coordinate:location2D]autorelease];
[mapView addAnnotation:annotation];
// MKCoordinateSpan span={latitudeDelta:0.2,longitudeDelta:0.2};
// MKCoordinateRegion region={location2D,span};
//[mapView setRegion:region];
//[self.view addSubview:mapView];
}
MKCoordinateSpan span={latitudeDelta:0.2,longitudeDelta:0.2};
MKCoordinateRegion region={location2D,span};
[mapView setRegion:region];
[self.view addSubview:mapView];
异常堆栈是：
2011-05-05 13:26:04.518[786:207] -[NSDecimalNumber stringByStandardizingWhitespace]: unrecognized selector sent to instance 0x6e6dca0
2011-05-05 13:26:04.520[786:207] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[NSDecimalNumber stringByStandardizingWhitespace]: unrecognized selector sent to instance 0x6e6dca0'
*** Call stack at first throw:
(
0 CoreFoundation 0x02915919 __exceptionPreprocess + 185
1 libobjc.A.dylib 0x0272a5de objc_exception_throw + 47
2 CoreFoundation 0x0291742b -[NSObject(NSObject) doesNotRecognizeSelector:] + 187
3 CoreFoundation 0x02887116 ___forwarding___ + 966
4 CoreFoundation 0x02886cd2 _CF_forwarding_prep_0 + 50
5 UIKit 0x00451608 -[UICalloutView setSubtitle:animated:] + 88
6 UIKit 0x004512d8 -[UICalloutView setSubtitle:] + 49
7 MapKit 0x023849de -[MKAnnotationContainerView _showBubbleForAnnotationView:bounce:scrollToFit:userInitiated:avoid:] + 527
8 MapKit 0x02385735 -[MKAnnotationContainerView _setSelectedAnnotationView:bounce:pressed:scrollToFit:userInitiated:avoid:] + 651
9 MapKit 0x0237fb78 -[MKAnnotationContainerView _setSelectedAnnotationView:bounce:pressed:scrollToFit:userInitiated:] + 144
10 MapKit 0x0235a891 -[MKMapView handleTap:] + 459
11 UIKit 0x005a2394 -[UIGestureRecognizer _updateGestureWithEvent:] + 727
12 UIKit 0x0059ebf3 -[UIGestureRecognizer _delayedUpdateGesture] + 47
13 UIKit 0x005a3486 _UIGestureRecognizerUpdateObserver + 637
14 CoreFoundation 0x028f6d1b __CFRUNLOOP_IS_CALLING_OUT_TO_AN_OBSERVER_CALLBACK_FUNCTION__ + 27
15 CoreFoundation 0x0288b987 __CFRunLoopDoObservers + 295
16 CoreFoundation 0x02854c17 __CFRunLoopRun + 1575
17 CoreFoundation 0x02854280 CFRunLoopRunSpecific + 208
18 CoreFoundation 0x028541a1 CFRunLoopRunInMode + 97
19 GraphicsServices 0x02e8e2c8 GSEventRunModal + 217
20 GraphicsServices 0x02e8e38d GSEventRun + 115
21 UIKit 0x0033ab58 UIApplicationMain + 1160
22 myApp 0x000021f8 main + 102
23 myApp 0x00002189 start + 53
)
terminate called after throwing an instance of 'NSException'
Program received signal: “SIGABRT”.
(gdb)
编辑1：
两个NSLog：
NSLog(@"distance: %@", [distance class]);
NSLog(@"ensStation: %@", [ensStation class]);
for循环内的告诉我：
2011-05-05 13:38:01.223 myApp[856:207] distance: NSCFNumber
2011-05-05 13:38:01.223 myApp[856:207] ensStation: NSCFString
2011-05-05 13:38:01.224 myApp[856:207] distance: NSDecimalNumber
2011-05-05 13:38:01.224 myApp[856:207] ensStation: NSCFString
2011-05-05 13:38:01.225 myApp[856:207] distance: NSDecimalNumber
2011-05-05 13:38:01.225 myApp[856:207] ensStation: NSCFString
2011-05-05 13:38:01.225 myApp[856:207] distance: NSDecimalNumber
2011-05-05 13:38:01.225 myApp[856:207] ensStation: NSCFString
2011-05-05 13:38:01.225 myApp[856:207] distance: NSDecimalNumber
2011-05-05 13:38:01.226 myApp[856:207] ensStation: NSCFString
2011-05-05 13:38:01.226 myApp[856:207] distance: NSCFNumber
2011-05-05 13:38:01.226 myApp[856:207] ensStation: NSCFString
2011-05-05 13:38:01.226 myApp[856:207] distance: NSDecimalNumber
2011-05-05 13:38:01.227 myApp[856:207] ensStation: NSCFString
2011-05-05 13:38:01.227 myApp[856:207] distance: NSDecimalNumber
2011-05-05 13:38:01.227 myApp[856:207] ensStation: NSCFString
(gdb)
编辑2： 嗨再次，注释的问题是固定的，但我想当我退出并回到视图时，我得到了相同的例外：
2011-05-05 14:56:47.374 TopStation[1234:207] *** Terminating app due to uncaught exception 'NSGenericException', reason: '*** Collection <__NSArrayM: 0x806b620> was mutated while being enumerated.(
"<MyLocation: 0x806c910>",
"<MyLocation: 0x806c7e0>",
"<MyLocation: 0x806c930>",
"<MyLocation: 0x806c9d0>",
"<MyLocation: 0x806ca20>",
"<MyLocation: 0x806cc40>",
"<MyLocation: 0x806c990>"
)'
*** Call stack at first throw:
(
0 CoreFoundation 0x02915919 __exceptionPreprocess + 185
1 libobjc.A.dylib 0x0272a5de objc_exception_throw + 47
2 CoreFoundation 0x029153d9 __NSFastEnumerationMutationHandler + 377
3 TopStation 0x00005691 -[StationsSurLaCarteViewController requestFinished:] + 343
4 TopStation 0x00019597 -[ASIHTTPRequest reportFinished] + 171
5 Foundation 0x000abe9a __NSThreadPerformPerform + 251
6 CoreFoundation 0x028f6d7f __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__ + 15
7 CoreFoundation 0x028552cb __CFRunLoopDoSources0 + 571
8 CoreFoundation 0x028547c6 __CFRunLoopRun + 470
9 CoreFoundation 0x02854280 CFRunLoopRunSpecific + 208
10 CoreFoundation 0x028541a1 CFRunLoopRunInMode + 97
11 GraphicsServices 0x02e8e2c8 GSEventRunModal + 217
12 GraphicsServices 0x02e8e38d GSEventRun + 115
13 UIKit 0x0033ab58 UIApplicationMain + 1160
14 TopStation 0x00002188 main + 102
15 TopStation 0x00002119 start + 53
)
terminate called after throwing an instance of 'NSException'
Program received signal: “SIGABRT”.
(gdb)
编辑3： 嗨再次，我必须每次出现视图时从注释清理地图所以我这样做（就在地图上显示注释之前：
if(request.responseStatusCode==200)
{
for (id<MKAnnotation> annotation in mapView.annotations) {
[mapView removeAnnotation:annotation];
}
//parse the response
//...
所以异常是由于这个for``loop，我从代码中删除它并且一切正常，但是，每次显示视图时我都需要从注释中清除地图，是否有另一种选择这样做 ？？提前thx：）
答案 0 :(得分：1)
问题在于这一行：
NSString *distance=[stationEnCours objectForKey:@"distance"];
根据NSLogs，stationEnCours中的“距离”对象是NSDecimalNumber（不是NSString）。然后将它传递给initWithAnnotation，假定它是一个NSString。
当地图视图试图显示标注气泡时，它还假设字幕是NSString并尝试在其上调用stringByStandardizingWhitespace并失败（因为它实际上是NSDecimalNumber）。
尝试将上述行更改为：
NSString *distance = [NSString stringWithFormat:@"%f",
[(NSDecimalNumber *)[stationEnCours objectForKey:@"distance"] doubleValue]];