我有一个在地图视图上绘制图钉的应用程序。
每个 pin 都使用此代码来显示详细信息披露按钮,点击该按钮时会调用 showDetail 方法,该方法然后调用prepareForSegue 方法。我认为这里有很多额外的工作。
我应该消除 showDetail 并只调用prepareForSegue 方法吗?但我该如何传入 MyLocation 对象呢?
这是代码:
- (MKAnnotationView *)mapView:(MKMapView *)mapView viewForAnnotation:(id <MKAnnotation>)annotation {
static NSString *identifier = @"MyLocation";
if ([annotation isKindOfClass:[MyLocation class]]) {
//test if mapviewnil
if (_mapView == nil) {
NSLog(@"NIL");
}
MKPinAnnotationView *annotationView = (MKPinAnnotationView *) [_mapView dequeueReusableAnnotationViewWithIdentifier:identifier];
if (annotationView == nil) {
annotationView = [[MKPinAnnotationView alloc] initWithAnnotation:annotation reuseIdentifier:identifier];
} else {
annotationView.annotation = annotation;
}
annotationView.enabled = YES;
annotationView.canShowCallout = YES;
annotationView.image=[UIImage imageNamed:@"locale.png"];
//instatiate a detail-disclosure button and set it to appear on right side of annotation
UIButton *infoButton = [UIButton buttonWithType:UIButtonTypeDetailDisclosure];
[infoButton addTarget:self action:@selector(showDetailView:annotation:) forControlEvents:UIControlEventTouchUpInside];
annotationView.rightCalloutAccessoryView = infoButton;
return annotationView;
}
return nil;
}
-(void)showDetailView:(id <MKAnnotation>)annotation{
//Set the data
MyLocation *sendingLocation = annotation;
DetailViewController *destinationViewController = segue.destinationViewController;
destinationViewController.receivedLocation = sendingLocation;
[self performSegueWithIdentifier: @"DetailVC" sender: self];
}
- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender{
if ([segue.identifier isEqualToString:@"DetailVC"]) {
NSLog(@"DetailVC called");
} else {
NSLog(@"PFS:something else");
}
}
提前谢谢!
通常您不会为按钮添加目标,而只是设置rightCalloutAccessoryView
(就像你一样)然后写一个calloutAccessoryControlTapped方法,例如:
- (MKAnnotationView *)mapView:(MKMapView *)mapView viewForAnnotation:(id <MKAnnotation>)annotation {
static NSString *identifier = @"MyLocation";
if ([annotation isKindOfClass:[MyLocation class]]) {
MKPinAnnotationView *annotationView = (MKPinAnnotationView *) [mapView dequeueReusableAnnotationViewWithIdentifier:identifier];
if (annotationView == nil) {
annotationView = [[MKPinAnnotationView alloc] initWithAnnotation:annotation reuseIdentifier:identifier];
annotationView.enabled = YES;
annotationView.canShowCallout = YES;
annotationView.image = [UIImage imageNamed:@"locale.png"]; // since you're setting the image, you could use MKAnnotationView instead of MKPinAnnotationView
annotationView.rightCalloutAccessoryView = [UIButton buttonWithType:UIButtonTypeDetailDisclosure];
} else {
annotationView.annotation = annotation;
}
return annotationView;
}
return nil;
}
- (void)mapView:(MKMapView *)mapView annotationView:(MKAnnotationView *)view calloutAccessoryControlTapped:(UIControl *)control
{
if (![view.annotation isKindOfClass:[MyLocation class]])
return;
// use the annotation view as the sender
[self performSegueWithIdentifier:@"DetailVC" sender:view];
}
- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(MKAnnotationView *)sender
{
if ([segue.identifier isEqualToString:@"DetailVC"])
{
DetailViewController *destinationViewController = segue.destinationViewController;
// grab the annotation from the sender
destinationViewController.receivedLocation = sender.annotation;
} else {
NSLog(@"PFS:something else");
}
}
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