ios - 在 map View 中向图钉添加操作时出错

Question

我正在尝试制作一个应用程序，在 map 上放置各种图钉。

当我触摸图钉时，标准气泡会弹出，并带有一个披露按钮。当我单击披露按钮时，我希望它打开一个新的 ViewController，以便我可以显示更多信息。

问题是，每次我运行该应用程序时，它都会崩溃，并在输出中给出错误。

我该如何解决这个问题？

输出的错误是:

2013-06-29 16:51:33.575 ...[2723:13d03] -[FirstViewController ...Clicked:]: unrecognized selector sent to instance 0x867d0d0 2013-06-29 16:51:33.576 lam[2723:13d03] * Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[FirstViewController ...Clicked:]: unrecognized selector sent to instance 0x867d0d0' * First throw call stack: (0x1d8d012 0x11cae7e 0x1e184bd 0x1d7cbbc 0x1d7c94e 0x11de705 0x182c0 0x18258 0xd9021 0xd957f 0xd86e8 0x47cef 0x47f02 0x25d4a 0x17698 0x1ce8df9 0x1ce8ad0 0x1d02bf5 0x1d02962 0x1d33bb6 0x1d32f44 0x1d32e1b 0x1ce77e3 0x1ce7668 0x14ffc 0x1e12 0x1d45) libc++abi.dylib: terminate called throwing an exception

我的 FirstViewController.m 中的代码是:

[...]

[...]

-(MKAnnotationView *) mapView:(MKMapView *)mapView viewForAnnotation:(id<MKAnnotation>)annotation {

    MKPinAnnotationView *MyPin=[[MKPinAnnotationView alloc] initWithAnnotation:annotation reuseIdentifier:@"current"];
    MyPin.pinColor = MKPinAnnotationColorPurple;

    UIButton *advertButton = [UIButton buttonWithType:UIButtonTypeDetailDisclosure];
    if ([[annotation title] isEqualToString:@"..."]) {
        [advertButton addTarget:self action:@selector(...Clicked:) forControlEvents:UIControlEventTouchUpInside];
    }

    if ([[annotation title] isEqualToString:@"..."]) {
        [advertButton addTarget:self action:@selector(...Clicked:) forControlEvents:UIControlEventTouchUpInside];
    }

    MyPin.rightCalloutAccessoryView = advertButton;
    MyPin.draggable = NO;
    MyPin.highlighted = YES;
    MyPin.animatesDrop=TRUE;
    MyPin.canShowCallout = YES;

    return MyPin;
}

- (void)mapView:(MKMapView *)mapView MyPin:(MKPinAnnotationView *)view calloutAccessoryControlTapped:(UIControl *)control {
    // Go to edit view
    UIViewController *detailViewController = [[UIViewController alloc] initWithNibName:@"...Controller" bundle:nil];
    [self.navigationController pushViewController:detailViewController animated:YES];
}


//-(void) ...Clicked:(id)sender {

  //  NSLog(@"... Clicked");
//}


-(void) ...:(id)sender {

    NSLog(@"...");
}


-(IBAction)findmylocation:(id)sender {

    mapView.showsUserLocation = YES;
    mapView.delegate = self;
    [mapView setUserTrackingMode:MKUserTrackingModeFollow animated:YES];

}

导致错误的原因是:

- (void)mapView:(MKMapView *)mapView MyPin:(MKPinAnnotationView *)view calloutAccessoryControlTapped:(UIControl *)control {
    // Go to edit view
    UIViewController *detailViewController = [[UIViewController alloc] initWithNibName:@"..." bundle:nil];
    [self.navigationController pushViewController:detailViewController animated:YES];
}

编辑2: 我已经删除了 advertButton addTarget 行，但现在运行模拟器时没有披露按钮...我删除的内容正确吗？

-(MKAnnotationView *) mapView:(MKMapView *)mapView viewForAnnotation:(id<MKAnnotation>)annotation {

    MKPinAnnotationView *MyPin=[[MKPinAnnotationView alloc] initWithAnnotation:annotation reuseIdentifier:@"current"];
    MyPin.pinColor = MKPinAnnotationColorPurple;

    UIButton *advertButton = [UIButton buttonWithType:UIButtonTypeDetailDisclosure];
    if ([[annotation title] isEqualToString:@"..."])

    if ([[annotation title] isEqualToString:@"..."]) 

Answer 1

错误:

[FirstViewController ...Clicked:]: unrecognized selector sent to instance

意味着它正在尝试调用 ...Clicked:方法FirstViewController (因为您将 advertButton 的目标设置为该方法)但没有这样的方法(您已将其注释掉)。

您可以取消评论。

但由于您使用的是 calloutAccessoryControlTapped无论如何，委托(delegate)方法来检测附件点击(比自定义方法更好的选择)，您应该执行以下操作:

删除 advertButton addTarget来自 viewForAnnotation 的行只需处理 calloutAccessoryControlTapped 中的水龙头即可.

同时删除 ...Clicked:方法。

另一个问题是方法calloutAccessoryControlTapped被错误地命名为mapView:MyPin:calloutAccessoryControlTapped: 。

该方法必须命名为 mapView:annotationView:calloutAccessoryControlTapped:像这样:

- (void)mapView:(MKMapView *)mapView annotationView:(MKAnnotationView *)view calloutAccessoryControlTapped:(UIControl *)control
{
    // Go to edit view
    UIViewController *detailViewController = [[UIViewController alloc] initWithNibName:@"...Controller" bundle:nil];
    [self.navigationController pushViewController:detailViewController animated:YES];
}

顺便说一句，在 calloutAccessoryControlTapped ，您将能够访问通过 view.annotation 点击的注释.

更新后viewForAnnotation应该是这样的:

-(MKAnnotationView *) mapView:(MKMapView *)mapView viewForAnnotation:(id<MKAnnotation>)annotation
{

    MKPinAnnotationView *MyPin=[[MKPinAnnotationView alloc] initWithAnnotation:annotation reuseIdentifier:@"current"];
    MyPin.pinColor = MKPinAnnotationColorPurple;

    UIButton *advertButton = [UIButton buttonWithType:UIButtonTypeDetailDisclosure];

    MyPin.rightCalloutAccessoryView = advertButton;
    MyPin.draggable = NO;
    MyPin.highlighted = YES;
    MyPin.animatesDrop=TRUE;
    MyPin.canShowCallout = YES;

    return MyPin;
}