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我有一個使用谷歌地圖視圖的應用程序。
在這個應用程序中，我想顯示一些自定義的切片和userLocation的自定義視圖。當位置管理器給出一個標題時，我想要顯示userLocation的自定義視圖，如果它未能提供一個，我想要默認的藍色動畫點回來等等...iPhone - 需要一些EXC_BAD_ACCESS幫助我瘋狂（包括完整的源代碼）
可用的項目和源代碼HERE
嗯，有2個問題在這裏：
1日的問題，真正的壞。你可以用這個小應用程序玩幾個小時。但是......啓動它，等待它加載，將其發送到後臺，將iPhone置於睡眠模式，等待一分鐘，喚醒iPhone，啓動應用程序（喚醒它）：崩潰，EXC_BAD_ACCESS。做同樣的事情不要把iPhone置於睡眠模式：不要崩潰。不等待一分鐘，但幾秒鐘，沒有崩潰。 10秒，沒有撞車，20秒，沒有撞車，接近30秒，也許是碰撞，接近一分鐘，撞車！
第二個問題（獎金:-)），可以與第一個鏈接，但這不是真正的這個問題的核心：我用來實現userPinLocation更新從/到藍色引腳似乎有一個非常糟糕的副作用：當你在街道上移動時，userLocation不會在地圖上移動。對於第二個問題的任何答案，如果它沒有直接與崩潰鏈接，請使用評論而不是答案。這不是問題的核心......我想...
要找到錯誤的代碼，我已經減少了我的應用程序的最低限度。這給了下面的代碼（一些提示，在源代碼註釋）：
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
我試圖斷點在每個方法，努力實現與環境變量殭屍（但是這需要在設備上跑了，我不知道他們已經真正激活），沒有任何解決方案啓動......我仍然不知道發生了什麼問題。
您是否看到如何解決EXC_BAD_ACCESS問題？
對於第二個問題的任何答案，如果它沒有解決崩潰，請使用註釋而不是答案。就我所見，這個問題並不是問題的核心。
提示：我在上面的代碼中發現了2條評論，我發現了一些解決方案的開始。有兩個地方，似乎沒有連接，可以從代碼中解決問題。什麼讓我發瘋是OR。
在iPhone 4上運行ios 4.2。1
你能爲我們創造微小的應用程序，並把它上傳到mediafire.com或其他一些網站在這裏發表的URL，所以我們可以把它撿起來。太懶惰地創建一個項目並複製粘貼代碼以進行調試。 – ARC
@Nikita：OK，做，看到我的編輯 – Oliver
[self.myMapView removeAnnotation：self.myMapView.userLocation]。 //這一行導致stacktrace崩潰，這是我見過的.. – ARC