问题
我的 MKMapView 有问题。当我初始化它并尝试添加几个注释时，应用程序崩溃，给我一个 SIGABRT 并声称我有一个“未捕获的异常'NSInvalidArgumentException'，原因：'-[__NSCFSet addObject: ]: 尝试插入 nil'" 我弄乱了 NSLogs 和我的代码，发现每当我调用 [mapView addAnnotation:myAnnotation] 时都会发生这种情况。我已经分别尝试了这两个注释，但应用程序仍然崩溃。
代码
这是我用于 MKMapView 的代码
IBOutlet MKMapView *mapView; //these are in interface
DisplayMap *thing1; //yes, I have @properties too, and I synthesize them
DisplayMap *thing2;
-(void) initMap //called in viewDidLoad after [super viewDidLoad]
{
[mapView setMapType:MKMapTypeStandard];
[mapView setZoomEnabled:YES];
[mapView setScrollEnabled:YES];
mapView.showsUserLocation = YES;
MKCoordinateRegion region = { {0.0, 0.0 }, { 0.0, 0.0 } };
region.center.latitude = 0;
region.center.longitude = 0;
region.span.longitudeDelta = 0.01f;
region.span.latitudeDelta = 0.01f;
[mapView setRegion:region animated:YES];
[mapView setDelegate:self];
thing1.title = @"thing1";
thing1.subtitle = @"is here";
thing1.coordinate = region.center;
thing2.title = @"thing2";
thing2.subtitle = @"is somewhere";
CLLocationCoordinate2D thing2Coord = {0.005,0.005};
thing2.coordinate = thing2Coord;
[mapView addAnnotation:thing1];
[mapView addAnnotation:thing2];
}
//and my DisplayMap code
//the .h
#import <Foundation/Foundation.h>
#import <MapKit/MKAnnotation.h>
@interface DisplayMap : NSObject <MKAnnotation> {
CLLocationCoordinate2D coordinate;
NSString *title;
NSString *subtitle;
}
@property (nonatomic, assign) CLLocationCoordinate2D coordinate;
@property (nonatomic, copy) NSString *title;
@property (nonatomic, copy) NSString *subtitle;
@end
//the .m
#import "DisplayMap.h"
@implementation DisplayMap
@synthesize coordinate,title,subtitle;
-(void)dealloc{
[title release];
[subtitle release];
[super dealloc];
}
@end
理论
我试图隔离 initMap 以便在我的应用程序的任何其余部分加载之前调用它。我稍后会运行其他进程，但此时它们不应处于活动状态，因为它们尚未初始化。我想这个问题可能与我初始化 MKMapView 本身或我的 Displaymap 属性有关。Xcode 无法检测到它，不管它是什么，我也不确定我得到的错误是什么意思。