Question

当我在任何地方按下地图视图时，由于未捕获的异常，地图已终止。

-[MapViewController handleGuesture]: unrecognized selector sent to instance 0xa046cc0
2013-04-15 10:41:23.316 CabServiceProvider[912:c07] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[MapViewController handleGuesture]: unrecognized selector sent to instance 0xa046cc0'

Here is code which is causing this error.

- (void)viewDidLoad{
    [super viewDidLoad];
    [self.mapView.userLocation addObserver:self
                                forKeyPath:@"location"
                                   options:(NSKeyValueObservingOptionNew|NSKeyValueObservingOptionOld)  
                                  context:NULL];
    mapView.userTrackingMode=YES;
    [mapView setUserTrackingMode:MKUserTrackingModeFollow];
     UITapGestureRecognizer  *gr=[[UITapGestureRecognizer alloc]initWithTarget:self        action:@selector(handleGuesture)];
    gr.numberOfTapsRequired=1;
    [mapView addGestureRecognizer:gr]; 
}

- (void)handleGesture:(UIGestureRecognizer *)gestureRecognizer{
    if (gestureRecognizer.state != UIGestureRecognizerStateEnded)
    return;
    CLLocationCoordinate2D coordinate; //= annotationView.annotation.coordinate;
    NSLog(@"dropped at %f,%f", coordinate.latitude, coordinate.longitude);
    CGPoint touchPoint = [gestureRecognizer locationInView:mapView];
    coordinate = [mapView convertPoint:touchPoint toCoordinateFromView:mapView];
    NSLog(@"latitude  %f longitude %f",coordinate.latitude,coordinate.longitude);
}

请帮助解决此错误的原因。

Answer 1

按照我的想法更改此行。

UITapGestureRecognizer *gr=[[UITapGestureRecognizer alloc]initWithTarget:self action:@selector(handleGuesture:)];
-------------------------------------------------------------------------------------------------------------^

在传递参数时，您需要添加: handleGuesture。

请检查

Answer 2

好的，请查看此行：

UITapGestureRecognizer  *gr=[[UITapGestureRecognizer alloc]initWithTarget:self        action:@selector(handleGesture:)];

当你打电话给你的方法时，你也会用错误的拼写来打电话。

无法识别的选择器发送到实例0xa046cc0

2 个答案: