Question

我有一个带引脚的地图视图，当用户选择一个引脚时，它会转到该引脚的详细信息屏幕。我还有一个表视图，当用户选择一个项目时，它会转到相同的类型详细信息视图。

这是问题......

从3.1.3到4.1，似乎工作正常。这是与引脚匹配的详细视图。但是我有一个刚刚升级到iOS 4.2的用户并且说它在4.1下工作正常，但在4.2中，引脚选择将他带到另一个引脚的细节。但在表视图中它仍然可以正常工作。

iOS 4.2中的MKMapView是否有可能改变pinID的选择方式？

添加 - 我添加了viewForAnnotation和checkButtonTapped的相关部分

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

int postTag = 0;

MKPinAnnotationView *pinView = (MKPinAnnotationView *)[eMapView dequeueReusableAnnotationViewWithIdentifier:@"Pin"];

if(pinView == nil) {

    pinView = [[MKPinAnnotationView alloc] initWithAnnotation:annotation reuseIdentifier:@"Pin"];
    pinView.frame = CGRectMake(0, 0, 25, 25);

} else {

    pinView.annotation = annotation;

}   

// Set up the Right callout
UIButton *myDetailButton = [UIButton buttonWithType:UIButtonTypeDetailDisclosure];
myDetailButton.frame = CGRectMake(0, 0, 23, 23);
myDetailButton.contentVerticalAlignment = UIControlContentVerticalAlignmentCenter;
myDetailButton.contentHorizontalAlignment = UIControlContentHorizontalAlignmentCenter;

[myDetailButton addTarget:self action:@selector(checkButtonTapped:) forControlEvents:UIControlEventTouchUpInside];

// Identify which pin is being selected
if ([[annotation title] isEqualToString:@"Current Location"]) {
    postTag = 99999;
} else {
    postTag = [annotation getPinID];

} 

myDetailButton.tag  = postTag;

pinView.rightCalloutAccessoryView = myDetailButton;

pinView.animatesDrop = YES;

// Set to show a callout on the pin
pinView.canShowCallout = YES;

return pinView;
}

// Method to show detail view when the callOut button is selected
- (IBAction) checkButtonTapped: (id) sender {

int nrButtonPressed = ((UIButton *)sender).tag;

if (nrButtonPressed < 99999) {
    if (self.showDetailView == nil) {

        DetailData *tmpViewController = [[DetailData alloc] initWithNibName:@"Detail" bundle:nil];
        self.showDetailView = tmpViewController;
        [tmpViewController release];

    }

    buttonDetail = [[mapView annotations] objectAtIndex:(nrButtonPressed-1)];

    NSMutableArray *tmpArray = [NSMutableArray arrayWithObjects: [buttonDetail getDataI], [buttonDetail getDataII], [buttonDetail getDataIII], [buttonDetail getDataIV], [buttonDetail getDataV], nil];

    self.showDetailView.eventData = [[NSMutableArray alloc] initWithArray:tmpArray copyItems:YES];

    [self.navigationController pushViewController:self.showDetailView animated:YES];

    [self.showDetailView.eventData release];

}

}

如您所见，在checkButtonTapped中，我记录了所选的引脚，然后从该引脚的注释中收集数据。问题似乎是nrButtonPressed现在不正确。但是在4.1

中编译时很好

Answer 1

在checkButtonTapped中，使用按钮的标签识别注释。通过调用自定义方法getPinID。

在viewForAnnotation中设置按钮的标记

button标签用作mapView注释数组的索引。目前尚不清楚getPinID方法如何在mapView的注释数组中找出它所处的索引。我不确定假设注释将在数组中的特定索引处是明智的。即使mapView没有随机播放注释，您的应用也可能会不断添加和删除注释。

因为您在注释视图中将按钮指定为标注附件，而不是使用按钮标记来标识注释，您可以使用mapView自己的mapView:annotationView:calloutAccessoryControlTapped:委托方法。

不是在按钮上执行addTarget并让它调用自定义方法，而是删除对addTarget的调用并实现calloutAccessoryControlTapped。

在calloutAccessoryControlTapped中，您可以使用view.annotation直接访问注释。您还可以轻松检查注释是否为“用户位置”：

 - (void)mapView:(MKMapView *)mapView annotationView:(MKAnnotationView *)view calloutAccessoryControlTapped:(UIControl *)control
    {
        if (view.annotation == mapView.userLocation)
            return;

        buttonDetail = (MyCustomAnnotationClass *)view.annotation;

        //show detail view using buttonDetail...
    }

此外，在viewForAnnotation中，即使重新使用视图，也每次都创建一个按钮。因此，重复使用的注释视图可能最终会将多个按钮放在一起。只应在if(pinView == nil)部分创建并设置该按钮。

Answer 2

如果有人愿意看看我现在正在使用什么（并且它正在运行）......

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

    MKPinAnnotationView *pinView = (MKPinAnnotationView *)[eMapView dequeueReusableAnnotationViewWithIdentifier:@"Pin"];

    if(pinView == nil) {

        pinView = [[MKPinAnnotationView alloc] initWithAnnotation:annotation reuseIdentifier:@"Pin"];
        pinView.frame = CGRectMake(0, 0, 25, 25);

    } else {

        pinView.annotation = annotation;

    }   

    // Set up the Right callout
    UIButton *myDetailButton = [UIButton buttonWithType:UIButtonTypeDetailDisclosure];
    myDetailButton.frame = CGRectMake(0, 0, 23, 23);
    myDetailButton.contentVerticalAlignment = UIControlContentVerticalAlignmentCenter;
    myDetailButton.contentHorizontalAlignment = UIControlContentHorizontalAlignmentCenter;

    pinView.rightCalloutAccessoryView = myDetailButton;

    pinView.animatesDrop = YES;

    // Set to show a callout on the pin
    pinView.canShowCallout = YES;

    return pinView;
}

// Added this at the suggestion of aBitObvious on StackOverflow - 120810
- (void)mapView:(MKMapView *)eMapView annotationView:(MKAnnotationView *)view calloutAccessoryControlTapped:(UIControl *)control {

    if (view.annotation == eMapView.userLocation)
        return;

    if (self.showDetailView == nil) {

        DetailData *tmpViewController = [[DetailData alloc] initWithNibName:@"DetailData" bundle:nil];
        self.showDetailView = tmpViewController;
        [tmpViewController release];

    }

    buttonDetail = (MyCustomAnnotationClass *)view.annotation;

    NSMutableArray *tmpArray = [NSMutableArray arrayWithObjects: [buttonDetail getDataI], [buttonDetail getDataII], [buttonDetail getDataIII], [buttonDetail getDataIV], [buttonDetail getDataV], nil];

    self.showDetailView.eventData = [[NSMutableArray alloc] initWithArray:tmpArray copyItems:YES];

    [self.navigationController pushViewController:self.showDetailView animated:YES];

    [self.showDetailView.eventData release];

}

再次感谢！

在iOS 4.2中使用Map Annotation和MKMapView的问题？

2 个答案: