xcode：打印 MKMapView 区域、跨度、latitudeDelta、longitudeDelta

Question

我正在尝试 NSLog MKMapView 的区域、跨度、latitudeDelta、longitudeDelta。但它发送的消息就像

Program received signal:  “EXC_BAD_ACCESS”.

我的代码是这样的：

@interface TaetPaViewController : UIViewController <MKMapViewDelegate, CLLocationManagerDelegate, NSXMLParserDelegate> {
    IBOutlet MKMapView *regionsMapView;
}

@property (nonatomic, retain) IBOutlet MKMapView *regionsMapView;

@synthesize regionsMapView;

- (void)mapView:(MKMapView *)mapView regionDidChangeAnimated:(BOOL)animated{
    NSLog(@"regionsMapView.region.span.latitudeDelta: %@", regionsMapView.region.span.latitudeDelta);

}

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

Answer 1

您正在打印 double (latitudeDelta) 作为指针。使用 %f 代替或类似的东西