Question

我想在目标c中的DetailDisclosure按钮中设置标记。我的旧代码是：

- (MKAnnotationView *)mapView:(MKMapView *)mapView viewForAnnotation:(id <MKAnnotation>)annotation
{
    if (annotation == mapView.userLocation)
    {
        return nil;
    }
    else
    {
        static NSString * const identifier = @"MyCustomAnnotation";

        static int i;

        MKAnnotationView* annotationView = [mapView dequeueReusableAnnotationViewWithIdentifier:identifier];

        if (annotationView)
        {
            annotationView.annotation = annotation;
        }
        else
        {
            annotationView = [[MKAnnotationView alloc] initWithAnnotation:annotation
                                                  reuseIdentifier:identifier];
        }

        NSLog(@"%i",annotationView.tag);
        annotationView.tag=annotationView.tag+1;
        NSLog(@"%i",annotationView.tag);

        annotationView.image = [UIImage imageNamed:@"pin1.png"];
        annotationView.canShowCallout = YES;
        UIImageView *sfIconView = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"newlocation.png"]];
        annotationView.leftCalloutAccessoryView = sfIconView;
        UIButton *InformationButton=[UIButton buttonWithType:UIButtonTypeDetailDisclosure];

        [InformationButton addTarget:self action:@selector(annotationButtClicked:) forControlEvents:UIControlEventTouchUpInside];

        InformationButton.tag=i;

        annotationView.rightCalloutAccessoryView=InformationButton;

        UILongPressGestureRecognizer *longGesture=[[UILongPressGestureRecognizer alloc]initWithTarget:self action:@selector(LongPressEvent:)];

        [annotationView addGestureRecognizer:longGesture];

        return annotationView;
    }
}

功能实施

- (void)annotationButtClicked:(id)sender
{
    NSLog(@"%i",[sender tag]);
}

控制台输出每次都是0。

如何在DetailDisclosure中设置标记？

Answer 1

如上所述，你不应该用大写字母命名你的变量，这在Objective c中通常表示一个Class。

请尝试使用此语法来设置标记的值。

[InformationButton setTag:i];

同时尝试NSLog(@"tag to set = %d", i);

因此，您可以看到代码运行时所设置的内容。

在DetailDisclosure中设置标记

1 个答案: