嗨伙计们！
我的 MySQL 中有大约 3-4k 注释，通过异步请求接收它们...仅显示注释是可以的，但我希望用户可以选择突出显示的注释以转到 DetailView（尚未实现，它是仅用于测试）...
只显示注释是可以的，只需要几秒钟（没有“viewForAnnotation”方法）......但是：使用这种方法大约需要 1 分钟才能显示所有注释并让我有可能使用我的“showDetails”按钮.
或者：我的代码错了吗（我在 Xcode 中是全新的）...看起来我的代码为每个注释创建了一个全新的视图，对吗？
如果我的代码是完整的废话告诉我，我必须从头开始再试一次，但也许我可以使用代码并改变一些东西。:-)
谢谢 4 帮助格哈德
MapViewController.h
#import<UIKit/UIKit.h>
#import<MapKit/MapKit.h>
@interface MapViewController : UIViewController <MKMapViewDelegate>
/*{
IBOutlet MKMapView* mapView;
}*/
@property (strong, nonatomic) IBOutlet MKMapView *mapView;
@property (strong, nonatomic) IBOutlet UIView *loadingView;
@property (nonatomic, strong) NSMutableArray *pois;
@end
MapViewController.m
#import "MapViewController.h"
@interface MapViewController ()
@end
@implementation MapViewController
- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
if (self) {
// Custom initialization
}
return self;
}
- (void)viewDidLoad
{
[super viewDidLoad];
[[self navigationController] setNavigationBarHidden:NO animated:NO];
_mapView.delegate = self;
}
- (void)didReceiveMemoryWarning
{
[super didReceiveMemoryWarning];
}
- (void)viewDidAppear:(BOOL)animated
{
[super viewDidAppear:animated];
[self loadPoiData];
[self zoomToUserLocation:self.mapView.userLocation];
}
- (void)mapView:(MKMapView *)mapView didUpdateUserLocation:(MKUserLocation *)userLocation
{
[self zoomToUserLocation:self.mapView.userLocation];
}
- (void)zoomToUserLocation:(MKUserLocation *)userLocation
{
if (!userLocation)
return;
MKCoordinateRegion region;
region.center = userLocation.location.coordinate;
region.span = MKCoordinateSpanMake(0.2, 0.2);
region = [self.mapView regionThatFits:region];
[self.mapView setRegion:region animated:YES];
}
- (void)loadPoiData
{
CLLocationCoordinate2D location;
NSURL *url = [NSURL URLWithString:@"http://myURL/AppFiles/poidrive.php"];
NSData *jsonData = [NSData dataWithContentsOfURL:url];
if(jsonData != nil)
{
NSError *error = nil;
_pois = [NSJSONSerialization JSONObjectWithData:jsonData options:NSJSONReadingMutableContainers error:&error];
}
_loadingView.hidden = YES;
for (NSDictionary *annotations in _pois)
{
location.latitude = [annotations[@"POI_LAT"] doubleValue];
location.longitude = [annotations[@"POI_LONG"] doubleValue];
CLLocationCoordinate2D coords = CLLocationCoordinate2DMake(location.latitude, location.longitude);
MKPointAnnotation *point = [MKPointAnnotation new];
point.coordinate = coords;
point.title = [annotations objectForKey:@"POI_NAME"];
point.subtitle = [annotations objectForKey:@"POI_ID"];
[self.mapView addAnnotation:point];
}
}
- (MKAnnotationView *)mapView:(MKMapView *)mapView viewForAnnotation:(id <MKAnnotation>)annotation
{
// if it's the user location, just return nil.
if ([annotation isKindOfClass:[MKUserLocation class]])
return nil;
// try to dequeue an existing pin view first
static NSString* AnnotationIdentifier = @"AnnotationIdentifier";
MKPinAnnotationView* pinView = [[MKPinAnnotationView alloc] initWithAnnotation:annotation reuseIdentifier:AnnotationIdentifier] ;
pinView.animatesDrop=YES;
pinView.canShowCallout=YES;
NSLog(@"test");
UIButton* rightButton = [UIButton buttonWithType:UIButtonTypeDetailDisclosure];
[rightButton setTitle:annotation.title forState:UIControlStateNormal];
[rightButton addTarget:self action:@selector(showDetails:) forControlEvents:UIControlEventTouchUpInside];
pinView.rightCalloutAccessoryView = rightButton;
//UIImageView *profileIconView = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"profile.png"]];
//pinView.leftCalloutAccessoryView = profileIconView;
return pinView;
}
-(IBAction)showDetails:(id)sender
{
NSLog(@"%@",((UIButton*)sender).currentTitle);
}
@end