Question

我有一个带有详细信息披露指示的mapView，当触摸时需要将MoreDetailViewController带到堆栈上。目前它崩溃了一个无法识别的选择器发送到实例错误。

我正试图弄清楚如何从披露指标按下调用此方法- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender。

这是带有披露指标的地图注释代码：

- (MKAnnotationView *)mapView:(MKMapView *)map viewForAnnotation:(id <MKAnnotation>)annotation
{
    MKPinAnnotationView *mapPin = nil;
    if(annotation != map.userLocation) 
    {
        static NSString *defaultPinID = @"defaultPin";
        mapPin = (MKPinAnnotationView *)[map dequeueReusableAnnotationViewWithIdentifier:defaultPinID];
        if (mapPin == nil )
        {
            mapPin = [[MKPinAnnotationView alloc] initWithAnnotation:annotation 
                                                      reuseIdentifier:defaultPinID];
            mapPin.canShowCallout = YES;

            UIButton *disclosureButton = [UIButton buttonWithType:UIButtonTypeDetailDisclosure];
            [disclosureButton addTarget:self action:@selector(prepareForSegue:) forControlEvents:UIControlEventTouchUpInside];

            mapPin.rightCalloutAccessoryView = disclosureButton;

        }
        else
            mapPin.annotation = annotation;

    }
    return mapPin;
}

这是应该调用的方法：

// Do some customisation of our new view when a table item has been selected
- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender
{
    // Make sure we're referring to the correct segue
    if ([[segue identifier] isEqualToString:@"ShowMoreInfo"]) {

        // Get reference to the destination view controller
        MoreDetailViewController *mdvc = [segue destinationViewController];


        [mdvc setSelectedItemName:[NSString stringWithFormat:@"%@", placeName.text]];
        [mdvc setSelectedItemAddress:[NSString stringWithFormat:@"%@", placeFormattedAddress.text]];

        [mdvc setSelectedItemWeb:[NSString stringWithFormat:@"%@", placeWebsite.text]];
        [mdvc setSelectedItemRating:[NSString stringWithFormat:@"%@", placeRating.text]];
  //      [mdvc setSelectedItemDistance:[NSString stringWithFormat:@"%@", placeDistance.text]];

    }
}

Answer 1

您有两种详细视图控制器，代码中为MoreDetailViewController，错误中为DetailViewController。你有可能将它们混合起来吗？

Answer 2

prepareForSegue：和prepareForSegue：sender：方法不一样。您的prepareForSegue：sender：方法中的placeName和friends也是未知的（或者是ivars）。

我会从根本上改变prepareForSegue：sender：方法并将其更改为

- (void)showMoreInfo:(id)sender{
        // Get reference to the destination view controller
        MoreDetailViewController *mdvc = [segue destinationViewController];

//define and set the placename and other variables

        [mdvc setSelectedItemName:[NSString stringWithFormat:@"%@", placeName.text]];
        [mdvc setSelectedItemAddress:[NSString stringWithFormat:@"%@", placeFormattedAddress.text]];

        [mdvc setSelectedItemWeb:[NSString stringWithFormat:@"%@", placeWebsite.text]];
        [mdvc setSelectedItemRating:[NSString stringWithFormat:@"%@", placeRating.text]];
  //      [mdvc setSelectedItemDistance:[NSString stringWithFormat:@"%@", placeDistance.text]];

    }
}

并以相同的方式调用它，只需更改名为

的选择器的名称

[disclosureButton addTarget:self action:@selector(showMoreInfo:) forControlEvents:UIControlEventTouchUpInside];

如果您正在使用注释和地图，则不应使用更多用于简单导航的segues。

触摸详细信息披露指示时，Mapview注释崩溃

2 个答案: