1
我有一个使用谷歌地图视图的应用程序。
在这个应用程序中，我想显示一些自定义的切片和userLocation的自定义视图。当位置管理器给出一个标题时，我想要显示userLocation的自定义视图，如果它未能提供一个，我想要默认的蓝色动画点回来等等...iPhone - 需要一些EXC_BAD_ACCESS帮助我疯狂（包括完整的源代码）
可用的项目和源代码HERE
嗯，有2个问题在这里：
1日的问题，真正的坏。你可以用这个小应用程序玩几个小时。但是......启动它，等待它加载，将其发送到后台，将iPhone置于睡眠模式，等待一分钟，唤醒iPhone，启动应用程序（唤醒它）：崩溃，EXC_BAD_ACCESS。做同样的事情不要把iPhone置于睡眠模式：不要崩溃。不等待一分钟，但几秒钟，没有崩溃。 10秒，没有撞车，20秒，没有撞车，接近30秒，也许是碰撞，接近一分钟，撞车！
第二个问题（奖金:-)），可以与第一个链接，但这不是真正的这个问题的核心：我用来实现userPinLocation更新从/到蓝色引脚似乎有一个非常糟糕的副作用：当你在街道上移动时，userLocation不会在地图上移动。对于第二个问题的任何答案，如果它没有直接与崩溃链接，请使用评论而不是答案。这不是问题的核心......我想...
要找到错误的代码，我已经减少了我的应用程序的最低限度。这给了下面的代码（一些提示，在源代码注释）：
EXC_BAD_ACCESS_TestViewController.h
#import <MapKit/MapKit.h>
@interface EXC_BAD_ACCESS_TestViewController : UIViewController<CLLocationManagerDelegate> {
CLLocationManager* locationMgr;
NSMutableArray* customAnnotations;
CLLocationDirection userHeading;
MKMapView* myMapView;
}
@property(nonatomic, retain) CLLocationManager* locationMgr;
@property(nonatomic, retain) NSMutableArray* customAnnotations;
@property(nonatomic, assign) CLLocationDirection userHeading;
@property(nonatomic, retain) IBOutlet MKMapView* myMapView;
- (void) loadAnnotations;
@end
EXC_BAD_ACCESS_TestViewController.m
// On first launch, due to code simplification, the app may crash when asked authorization to use geo hardware. Just kill/relaunch after accepting.
// Breakpoints on each method entry : EXC_BAD_ACCESS crash without any break-stop
#import "EXC_BAD_ACCESS_TestViewController.h"
#import "CustomAnnotation.h"
@implementation EXC_BAD_ACCESS_TestViewController
@synthesize locationMgr, customAnnotations, myMapView, userHeading;
// ===========================================================================================================
-(id) initWithCoder:(NSCoder *)aDecoder
{
self = [super initWithCoder:aDecoder];
if (!self) return nil;
self.userHeading = -1;
return self;
}
// ===========================================================================================================
- (void) viewDidLoad
{
[self loadAnnotations];
self.myMapView.mapType = MKMapTypeStandard;
self.myMapView.showsUserLocation = YES;
// -----------------------------------------------
// Just comment this sole line : no more crash
// -----------------------------------------------
for (CustomAnnotation* pin in self.customAnnotations) [self.myMapView addAnnotation:pin];
// locationManager
self.locationMgr = [[CLLocationManager alloc] init];
self.locationMgr.desiredAccuracy = kCLLocationAccuracyBest;
self.locationMgr.distanceFilter = 1.0;
self.locationMgr.headingFilter = 1.0;
self.locationMgr.purpose = @"Some purpose.";
self.locationMgr.delegate = self;
[self.locationMgr startUpdatingHeading];
[super viewDidLoad];
}
// ===========================================================================================================
- (void) loadAnnotations
{
// Code for testing, real code gets the datas using another way of doing, as simple as this one
self.customAnnotations = [NSMutableArray array];
double latitude = 45.0;
double longitude = -45.0;
for (int i=1; i<=400; i++) {
CLLocationCoordinate2D pinLocation = CLLocationCoordinate2DMake(latitude, longitude);
CustomAnnotation* pin = [[[CustomAnnotation alloc] initWithCoordinate:pinLocation] autorelease];
[self.customAnnotations addObject:pin];
latitude += 0.01;
longitude += 0.01;
}
}
// ===========================================================================================================
- (MKAnnotationView *) mapView:(MKMapView *)mapView viewForAnnotation:(id <MKAnnotation>) annotation
{
MKAnnotationView* pinView = nil;
NSString* annotationIdentifier;
UIImage* pinImage;
BOOL canShowCallout;
// User location
if ([annotation isKindOfClass:[MKUserLocation class]] && self.userHeading >= 0) {
annotationIdentifier = @"UserLocationAnnotation";
pinImage = [UIImage imageNamed:@"custom_userlocation.png"];
canShowCallout = NO;
}
// Custom Pin
else if ([annotation isKindOfClass:[CustomAnnotation class]]) {
annotationIdentifier = @"CustomAnnotation";
pinImage = [UIImage imageNamed:@"custom_pin.png"];
canShowCallout = YES;
}
// Others
else {
return nil;
}
pinView = (MKAnnotationView*)[mapView dequeueReusableAnnotationViewWithIdentifier:annotationIdentifier];
if (pinView) {
pinView.annotation = annotation;
}
else {
pinView = [[[MKAnnotationView alloc] initWithAnnotation:annotation reuseIdentifier:annotationIdentifier] autorelease];
if (pinView) {
pinView.image = pinImage;
pinView.canShowCallout = canShowCallout;
if (canShowCallout) {
pinView.calloutOffset = CGPointMake(-5, 5);
pinView.rightCalloutAccessoryView = [UIButton buttonWithType:UIButtonTypeDetailDisclosure];
}
}
}
return pinView;
}
// -----------------------------------------------
// Just comment this method : no more crash
// -----------------------------------------------
// ===========================================================================================================
- (void)locationManager:(CLLocationManager *)manager didUpdateHeading:(CLHeading *)newHeading
{
if (!self.myMapView) return;
if (!self.myMapView.userLocation) return;
CLLocationDirection compassHeading_True = newHeading.trueHeading;
CLLocationDirection compassHeading_Magnetic = newHeading.magneticHeading;
CLLocationDirection heading;
if (compassHeading_True == -1) heading = compassHeading_Magnetic;
else if (newHeading.headingAccuracy >= 0) heading = compassHeading_True;
else heading = -1;
// If we get/loose the heading, update pin image
// I didn't found any other solution to force the user pin to update its display.
if ((self.userHeading == -1 || heading == -1) && self.userHeading != heading) {
[self.myMapView removeAnnotation:self.myMapView.userLocation];
self.userHeading = heading;
[self.myMapView addAnnotation:self.myMapView.userLocation];
}
self.userHeading = heading;
// ------------------------------------
// Some non bugued code was there
// ------------------------------------
}
// ===========================================================================================================
- (void) dealloc
{
self.myMapView = nil;
self.customAnnotations = nil;
self.locationMgr = nil;
[super dealloc];
}
@end
CustomAnnotation.h
#import <MapKit/MapKit.h>
@interface CustomAnnotation : NSObject<MKAnnotation> {
CLLocationCoordinate2D coordinate;
}
@property(nonatomic, assign) CLLocationCoordinate2D coordinate;
- (id)initWithCoordinate:(CLLocationCoordinate2D) c;
@end
CustomAnnotation.m
#import "CustomAnnotation.h"
@implementation CustomAnnotation
@synthesize coordinate;
// ===========================================================================================================
- (id)initWithCoordinate:(CLLocationCoordinate2D) c
{
self = [super init];
if (!self) return nil;
self.coordinate = c;
return self;
}
// ===========================================================================================================
- (NSString*)subtitle
{
return @"";
}
// ===========================================================================================================
- (NSString*)title
{
return @"";
}
@end
我试图断点在每个方法，努力实现与环境变量僵尸（但是这需要在设备上跑了，我不知道他们已经真正激活），没有任何解决方案启动......我仍然不知道发生了什么问题。
您是否看到如何解决EXC_BAD_ACCESS问题？
对于第二个问题的任何答案，如果它没有解决崩溃，请使用注释而不是答案。就我所见，这个问题并不是问题的核心。
提示：我在上面的代码中发现了2条评论，我发现了一些解决方案的开始。有两个地方，似乎没有连接，可以从代码中解决问题。什么让我发疯是OR。
在iPhone 4上运行ios 4.2。1
你能为我们创造微小的应用程序，并把它上传到mediafire.com或其他一些网站在这里发表的URL，所以我们可以把它捡起来。太懒惰地创建一个项目并复制粘贴代码以进行调试。 – ARC
@Nikita：OK，做，看到我的编辑 – Oliver
[self.myMapView removeAnnotation：self.myMapView.userLocation]。 //这一行导致stacktrace崩溃，这是我见过的.. – ARC