这是问题……
从3.1.3到4.1,它似乎工作得很好.这是与引脚匹配的详细视图.但是我有一个用户刚刚升级到iOS 4.2并说它在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是否可能会更改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(0,25,25);
} else {
pinView.annotation = annotation;
}
// Set up the Right callout
UIButton *myDetailButton = [UIButton buttonWithType:UIButtonTypeDetailDisclosure];
myDetailButton.frame = CGRectMake(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
解决方法
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：delegate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使多个按钮相互叠加.该按钮应仅在if(pinView == nil)部分中创建和设置.
