-(MKAnnotationView *) mapView: 在第一次运行视图时没有触发。
我从 JSON 调用中加载引脚。引脚可以很好地加载所有信息，但调用（*参见代码）并将它们变成紫色。（在 -(MKAnnotationView *) mapView2 :) 中完成但是当我离开该选项卡并返回它时，它会被调用并一切都很好。
为什么这不行？因为最终用户如果只检查一次，就不会知道地图图钉具有电话呼叫功能。
进度流：它加载地图。加载引脚。呼出时将引脚更改为紫色。然后缩放到引脚和当前位置。但在第一次运行时，它不会更改带有呼叫的引脚。
我已将其缩小到 -(MKAnnotationView *) mapView: 在几次测试中第一次没有触发，但是在一次测试中它确实触发了，但只在两个引脚中的第二个被调用，直到重新加载视图。
我愿意接受任何改进与此相关的任何代码天气的建议。我总是喜欢学习更好的方法来做我所做的事情。因此，请随意提出您的批评。
.h 文件
@class 可达性；
@interface LocationsViewController : UIViewController <MKMapViewDelegate,CLLocationManagerDelegate>
{
NSString *phone;
IBOutlet MKMapView *mapView;
CLLocationManager *locationManager;
NSURLConnection *theConnection;
Reachability* internetReachable;
Reachability* hostReachable;
}
@property(nonatomic, retain) IBOutlet MKMapView *mapView;
@property(nonatomic, retain)CLLocationManager *locationManager;
@property(nonatomic, retain) NSString *phone;
- (BOOL) connectedToNetwork;
- (void) mapPinsJSON;
@end
.m 文件
@implementation LocationsViewController
@synthesize mapView;
@synthesize locationManager;
@synthesize phone;
MapAnnotation *ann1;
- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
if (self)
{
self.title = NSLocalizedString(@"Locations", @"Locations");
self.tabBarItem.image = [UIImage imageNamed:@"locations"];
}
return self;
}
- (void)dealloc
{
[super dealloc];
[[NSNotificationCenter defaultCenter] removeObserver:self];
}
- (void)didReceiveMemoryWarning
{
// Releases the view if it doesn't have a superview.
[super didReceiveMemoryWarning];
// Release any cached data, images, etc that aren't in use.
}
#pragma mark - View lifecycle
//Implement viewDidLoad to do additional setup after loading the view, typically from a nib.
- (void)viewDidLoad
{
[super viewDidLoad];
}
- (void)locationManager:(CLLocationManager *)manager didUpdateToLocation:(CLLocation *)newLocation fromLocation:(CLLocation *)oldLocation
{
MKCoordinateRegion region;
region.center.latitude = newLocation.coordinate.latitude;
region.center.longitude= newLocation.coordinate.longitude;
region.span.longitudeDelta=0.2;
region.span.latitudeDelta =0.2;
[mapView setRegion:region animated:YES];
[mapView setDelegate:self];
NSTimer *myTimer;
myTimer = [NSTimer scheduledTimerWithTimeInterval:2 target:self selector:@selector(countDown) userInfo:nil repeats:NO];
[self zoomMapViewToFitAnnotations:self.mapView animated:YES];
}
-(void)countDown{
[locationManager stopUpdatingLocation];
}
-(void)viewDidDisappear:(BOOL)animated
{
[locationManager stopUpdatingLocation];
}
-(void)viewDidAppear:(BOOL)animated
{
[super viewDidAppear:animated];
[mapView removeAnnotations:mapView.annotations];
self.locationManager = [[CLLocationManager alloc] init];
locationManager.delegate = self;
locationManager.desiredAccuracy = kCLLocationAccuracyBest;
[locationManager startUpdatingLocation];
if([self connectedToNetwork] != YES)
{
UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"OH NO!" message:@"To get the latest information you need a data or wi-fi connection" delegate:self cancelButtonTitle:@"OK" otherButtonTitles:nil, nil];
[alert show];
[alert release];
}
else
{
[self performSelectorInBackground:@selector(mapPinsJSON) withObject:nil];
}
}
- (void) mapPinsJSON{
NSString *urlString = [NSString stringWithFormat:@"http://www.mywebsite.com/api/newlocations25/json.json"];
NSURL *url = [NSURL URLWithString:urlString];
NSData *data = [NSData dataWithContentsOfURL:url];
NSError *error;
NSMutableDictionary *json = [NSJSONSerialization JSONObjectWithData:data options:kNilOptions error:&error];
for(id key in json) {
id value = [json objectForKey:key];
NSString *titlePin = [value valueForKey:@"address"];
NSString *address = [value valueForKey:@"title"];
NSString *latitude = [value valueForKey:@"latitude"];
NSString *longitude = [value valueForKey:@"longitude"];
NSArray* foo = [address componentsSeparatedByString: @":"];
NSString* address2 = [foo objectAtIndex: 0];
phone = [foo objectAtIndex: 1];
double myLatitude = [latitude doubleValue];
double myLongitude = [longitude doubleValue];
MKCoordinateRegion location1;
location1.center.latitude =myLatitude;
location1.center.longitude= myLongitude;
location1.span.longitudeDelta=0.1;
location1.span.latitudeDelta =0.1;
ann1 =[[[MapAnnotation alloc] init] autorelease];
ann1.title=[NSString stringWithFormat:@"%@",titlePin];
ann1.subtitle=[NSString stringWithFormat:@"%@",address2];
ann1.phone=[NSString stringWithFormat:@"%@",phone];
ann1.coordinate= location1.center;
[mapView addAnnotation:ann1];
[phone retain];
}
}
-(MKAnnotationView *) mapView:(MKMapView *)mapView2 viewForAnnotation:(id<MKAnnotation>)annotation {
if (annotation == mapView2.userLocation) {
return nil;
}else{
MKPinAnnotationView *MyPin=[[MKPinAnnotationView alloc] initWithAnnotation:annotation reuseIdentifier:@"current"];
MyPin.pinColor = MKPinAnnotationColorPurple;
UIButton *advertButton = [UIButton buttonWithType:UIButtonTypeInfoDark];
[advertButton setImage:[UIImage imageNamed:@"mapphone"] forState:UIControlStateNormal];
[advertButton addTarget:self action:@selector(button:) forControlEvents:UIControlEventTouchUpInside];
MyPin.rightCalloutAccessoryView = advertButton;
MyPin.draggable = NO;
MyPin.highlighted = YES;
MyPin.animatesDrop=TRUE;
MyPin.canShowCallout = YES;
return MyPin;
}
}
-(void)button:(id)sender {
UIButton *button = (UIButton *)sender;
MKPinAnnotationView *annotationView = (MKPinAnnotationView*)button.superview.superview;
MapAnnotation *mapAnnotation = annotationView.annotation;
UIDevice *device = [UIDevice currentDevice];
if ([[device model] isEqualToString:@"iPhone"] ) {
[[UIApplication sharedApplication] openURL:[NSURL URLWithString:[NSString stringWithFormat:@"tel:%@",mapAnnotation.phone]]];
} else {
UIAlertView *Notpermitted=[[UIAlertView alloc] initWithTitle:mapAnnotation.phone message:@"Your device doesn't support this feature." delegate:nil cancelButtonTitle:@"OK" otherButtonTitles:nil];
[Notpermitted show];
[Notpermitted release];
}
}
- (BOOL) connectedToNetwork
{
Reachability *r = [Reachability reachabilityWithHostName:@"www.google.com"];
NetworkStatus internetStatus = [r currentReachabilityStatus];
BOOL internet;
if ((internetStatus != ReachableViaWiFi) && (internetStatus != ReachableViaWWAN)) {
internet = NO;
} else {
internet = YES;
}
return internet;
}
- (void)viewDidUnload
{
[super viewDidUnload];
// Release any retained subviews of the main view.
// e.g. self.myOutlet = nil;
}
- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
{
// Return YES for supported orientations
return YES;
}
#define MINIMUM_ZOOM_ARC 0.014 //approximately 1 miles (1 degree of arc ~= 69 miles)
#define ANNOTATION_REGION_PAD_FACTOR 1.15
#define MAX_DEGREES_ARC 360
- (void)zoomMapViewToFitAnnotations:(MKMapView *)mapView3 animated:(BOOL)animated
{
NSArray *annotations = mapView.annotations;
int count = [mapView.annotations count];
if ( count == 0) { return; } //bail if no annotations
//convert NSArray of id <MKAnnotation> into an MKCoordinateRegion that can be used to set the map size
//can't use NSArray with MKMapPoint because MKMapPoint is not an id
MKMapPoint points[count]; //C array of MKMapPoint struct
for( int i=0; i<count; i++ ) //load points C array by converting coordinates to points
{
CLLocationCoordinate2D coordinate = [(id <MKAnnotation>)[annotations objectAtIndex:i] coordinate];
points[i] = MKMapPointForCoordinate(coordinate);
}
//create MKMapRect from array of MKMapPoint
MKMapRect mapRect = [[MKPolygon polygonWithPoints:points count:count] boundingMapRect];
//convert MKCoordinateRegion from MKMapRect
MKCoordinateRegion region = MKCoordinateRegionForMapRect(mapRect);
//add padding so pins aren't scrunched on the edges
region.span.latitudeDelta *= ANNOTATION_REGION_PAD_FACTOR;
region.span.longitudeDelta *= ANNOTATION_REGION_PAD_FACTOR;
//but padding can't be bigger than the world
if( region.span.latitudeDelta > MAX_DEGREES_ARC ) { region.span.latitudeDelta = MAX_DEGREES_ARC; }
if( region.span.longitudeDelta > MAX_DEGREES_ARC ){ region.span.longitudeDelta = MAX_DEGREES_ARC; }
//and don't zoom in stupid-close on small samples
if( region.span.latitudeDelta < MINIMUM_ZOOM_ARC ) { region.span.latitudeDelta = MINIMUM_ZOOM_ARC; }
if( region.span.longitudeDelta < MINIMUM_ZOOM_ARC ) { region.span.longitudeDelta = MINIMUM_ZOOM_ARC; }
//and if there is a sample of 1 we want the max zoom-in instead of max zoom-out
if( count == 1 )
{
region.span.latitudeDelta = MINIMUM_ZOOM_ARC;
region.span.longitudeDelta = MINIMUM_ZOOM_ARC;
}
[mapView3 setRegion:region animated:animated];
}
@end