Question

早安StackOverflow，在我的'europeMapView'上运行我的自定义注释调出后，我现在需要将用户发送到webView，现在我希望webView可能从JSON文件加载URL，具体取决于哪个标注被点击了。我相信我应该使用NSJSONSerialization，虽然我不确定如何实现它？

所以在'europeMapView'中点击'Rome'call out按钮时，用户需要'EuropeWebView'并加载字符串www.ThingsAboutRome.com。

我想我可以为每个注释添加一个webView，但这看起来非常低效。（加上我无法动态更改网址。）

我也在使用Storyboard。

#import "UKFlightsEuropeMap.h"
#import "Annotation.h"



@interface UKFlightsEuropeMap ()

@end

@implementation UKFlightsEuropeMap
@synthesize europeMapView;

//Define the Long and Lat of different European cities.


#define EUROPE_LATITUDE 47.3690;
#define EUROPE_LONGITUDE 8.5380;

#define LONDON_LATITUDE 51.5171;
#define LONDON_LONGITUDE 0.1062;

#define PARIS_LATITUDE 48.8742;
#define PARIS_LONGITUDE 2.3470;

#define BRUSSELS_LATITUDE 50.75;
#define BRUSSELS_LONGITUDE 4.53333;

#define BERLIN_LATITUDE 52.5;
#define BERLIN_LONGITUDE 13.35;

#define MUNICH_LATITUDE 48.1333;
#define MUNICH_LONGITUDE 11.5667;

#define ZURICH_LATITUDE 47.3690;
#define ZURICH_LONGITUDE 8.5380;

#define MILAN_LATITUDE 45.4640;
#define MILAN_LONGITUDE 9.1916;

#define MADRID_LATITUDE 40.4000;
#define MADRID_LONGITUDE -3.6833;

#define ROME_LATITUDE 41.9000;
#define ROME_LONGITUDE 12.5000;

#define LISBON_LATITUDE 38.7000;
#define LISBON_LONGITUDE 9.1833;

#define VIENNA_LATITUDE 48.2088;
#define VIENNA_LONGITUDE 16.3726;

#define THE_SPAN 0.01f;


- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
if (self) {
    // Custom initialization
}
return self;
}

- (void)viewDidLoad
{
[super viewDidLoad];

[europeMapView setDelegate:self];

// Do any additional setup after loading the view.

//Create my region

MKCoordinateRegion myRegion;

//Set region centre
CLLocationCoordinate2D center;
center.latitude = EUROPE_LATITUDE;
center.longitude = EUROPE_LONGITUDE;

//Set span (zoom level)
MKCoordinateSpan span;
span.latitudeDelta = THE_SPAN;
span.longitudeDelta = THE_SPAN;

myRegion.center = center;
myRegion.span = span;

//Set our region to the europeMapView

[europeMapView setRegion:myRegion animated:YES];


//Annotation

NSMutableArray * locations = [[NSMutableArray alloc] init];
CLLocationCoordinate2D location;
Annotation * myAnn;

//London Annotation

myAnn = [[Annotation alloc] init];
location.latitude = LONDON_LATITUDE;
location.longitude = LONDON_LONGITUDE;
myAnn.coordinate = location;
myAnn.title = @"London";
myAnn.subtitle = @"London City";


[locations addObject:myAnn];

//Paris Annotation

myAnn = [[Annotation alloc] init];
location.latitude = PARIS_LATITUDE;
location.longitude = PARIS_LONGITUDE;
myAnn.coordinate = location;
myAnn.title = @"Paris";
myAnn.subtitle = @"City of Love";
[locations addObject:myAnn];

//Brussels Annotation

myAnn = [[Annotation alloc] init];
location.latitude = BRUSSELS_LATITUDE;
location.longitude = BRUSSELS_LONGITUDE;
myAnn.coordinate = location;
myAnn.title = @"Brussels";
myAnn.subtitle = @"Brussels";
[locations addObject:myAnn];

//Berlin Annotation

myAnn = [[Annotation alloc] init];
location.latitude = BERLIN_LATITUDE;
location.longitude = BERLIN_LONGITUDE;
myAnn.coordinate = location;
myAnn.title = @"Berlin";
myAnn.subtitle = @"Berlin";
[locations addObject:myAnn];

//Munich Annotation

myAnn = [[Annotation alloc] init];
location.latitude = MUNICH_LATITUDE;
location.longitude = MUNICH_LONGITUDE;
myAnn.coordinate = location;
myAnn.title = @"Munich";
myAnn.subtitle = @"Munich";
[locations addObject:myAnn];

//Zurich Annotation

myAnn = [[Annotation alloc] init];
location.latitude = ZURICH_LATITUDE;
location.longitude = ZURICH_LONGITUDE;
myAnn.coordinate = location;
myAnn.title = @"Zurich";
myAnn.subtitle = @"Zurich";
[locations addObject:myAnn];

//Milan Annotation

myAnn = [[Annotation alloc] init];
location.latitude = MILAN_LATITUDE;
location.longitude = MILAN_LONGITUDE;
myAnn.coordinate = location;
myAnn.title = @"Milan";
myAnn.subtitle = @"Milan";
[locations addObject:myAnn];

//Madrid Annotation

myAnn = [[Annotation alloc] init];
location.latitude = MADRID_LATITUDE;
location.longitude = MADRID_LONGITUDE;
myAnn.coordinate = location;
myAnn.title = @"Madrid";
myAnn.subtitle = @"Madrid";
[locations addObject:myAnn];

//Rome Annotation

myAnn = [[Annotation alloc] init];
location.latitude = ROME_LATITUDE;
location.longitude = ROME_LONGITUDE;
myAnn.coordinate = location;
myAnn.title = @"Rome";
myAnn.subtitle = @"Rome";
[locations addObject:myAnn];

//Lisbon Annotation

myAnn = [[Annotation alloc] init];
location.latitude = LISBON_LATITUDE;
location.longitude = LISBON_LONGITUDE;
myAnn.coordinate = location;
myAnn.title = @"Lisbon";
myAnn.subtitle = @"Lisbon";
[locations addObject:myAnn];

//Vienna Annotation

myAnn = [[Annotation alloc] init];
location.latitude = VIENNA_LATITUDE;
location.longitude = VIENNA_LONGITUDE;
myAnn.coordinate = location;
myAnn.title = @"Vienna";
myAnn.subtitle = @"Vienna";
[locations addObject:myAnn];

//Add the NSMutable Array to the europeMapView.


[self.europeMapView addAnnotations:locations];




}

//Customize the annotation callouts.

-(MKAnnotationView *) mapView:(MKMapView *)europeMapView viewForAnnotation:        (id<MKAnnotation>)annotation { MKPinAnnotationView *MyPin=[[MKPinAnnotationView alloc]     initWithAnnotation:annotation reuseIdentifier:@"current"];
MyPin.pinColor = MKPinAnnotationColorPurple;

UIButton *advertButton = [UIButton buttonWithType:UIButtonTypeDetailDisclosure];
if ([[annotation title] isEqualToString:@"London"]){
    [advertButton addTarget:self action:@selector(LondonClicked:)     forControlEvents:UIControlEventTouchUpInside];        
}

if ([[annotation title] isEqualToString:@"Paris"]){
    [advertButton addTarget:self action:@selector(ParisClicked:)     forControlEvents:UIControlEventTouchUpInside];
}

if ([[annotation title] isEqualToString:@"Brussels"]){
    [advertButton addTarget:self action:@selector(BrusselsClicked:) forControlEvents:UIControlEventTouchUpInside];
}

if ([[annotation title] isEqualToString:@"Berlin"]){
    [advertButton addTarget:self action:@selector(BerlinClicked:) forControlEvents:UIControlEventTouchUpInside];
}

if ([[annotation title] isEqualToString:@"Munich"]){
    [advertButton addTarget:self action:@selector(MunichClicked:) forControlEvents:UIControlEventTouchUpInside];
}

if ([[annotation title] isEqualToString:@"Zurich"]){
    [advertButton addTarget:self action:@selector(ZurichClicked:) forControlEvents:UIControlEventTouchUpInside];
}

if ([[annotation title] isEqualToString:@"Milan"]){
    [advertButton addTarget:self action:@selector(MilanClicked:) forControlEvents:UIControlEventTouchUpInside];
}

if ([[annotation title] isEqualToString:@"Madrid"]){
    [advertButton addTarget:self action:@selector(MadridClicked:) forControlEvents:UIControlEventTouchUpInside];
}

if ([[annotation title] isEqualToString:@"Rome"]){
    [advertButton addTarget:self action:@selector(RomeClicked:) forControlEvents:UIControlEventTouchUpInside];
}

if ([[annotation title] isEqualToString:@"Lisbon"]){
    [advertButton addTarget:self action:@selector(LisbonClicked:) forControlEvents:UIControlEventTouchUpInside];
}

if ([[annotation title] isEqualToString:@"Vienna"]){
    [advertButton addTarget:self action:@selector(ViennaClicked:) forControlEvents:UIControlEventTouchUpInside];
}


MyPin.rightCalloutAccessoryView = advertButton;
MyPin.draggable = NO;
MyPin.highlighted = YES;
MyPin.animatesDrop = TRUE;
MyPin.canShowCallout = YES;


return MyPin;

}

//Show that the detailDisclosure Button has been pressed.

-(void)LondonClicked:(id)sender {
NSLog(@"London Clicked"); 
}
-(void)ParisClicked:(id)sender {
NSLog(@"Paris Clicked");
}
-(void)BrusselsClicked:(id)sender {
NSLog(@"Brussels Clicked");
}
-(void)BerlinClicked:(id)sender {
NSLog(@"Berlin Clicked");
}
-(void)MunichClicked:(id)sender {
NSLog(@"Munich Clicked");
}
-(void)ZurichClicked:(id)sender {
NSLog(@"Zurich Clicked");
}
-(void)MilanClicked:(id)sender {
NSLog(@"Milan Clicked");
}
-(void)MadridClicked:(id)sender {
NSLog(@"Madrid Clicked");
}
-(void)RomeClicked:(id)sender {
NSLog(@"Rome Clicked");
}
-(void)LisbonClicked:(id)sender {
NSLog(@"Lisbon Clicked");
}
-(void)ViennaClicked:(id)sender {
NSLog(@"Vienna Clicked");
}


- (void)didReceiveMemoryWarning
{
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}


@end

编辑：JSON文件的示例。

{
"ID": "London",
"Link": "http://www.London.co.uk",
"ID": "Paris",
"Link": "http://www.Paris.fr"
}

非常感谢你的时间。

尼克。

Answer 1

首先，我建议将数据格式更改为：

{
   "london":{
      "link":"http://www.London.co.uk",
      "moredata":"..."
   },
   "paris":{
      "link":"http://www.Paris.fr",
      "moredata":"..."
   }
}

这将代表一个拥有相关属性的城市。在您的版本中，无法查找特定城市的正确链接。

然后您可以按如下方式解析和访问不同的部分：

NSString *json = @"{\"london\":{\"link\":\"http://www.London.co.uk\",\"moredata\":\"...\"},\"paris\":{\"link\":\"http://www.Paris.fr\",\"moredata\":\"...\"}}";

NSData *data = [json dataUsingEncoding:NSUTF8StringEncoding];

NSError *error;

NSDictionary *cities = [NSJSONSerialization JSONObjectWithData:data options:nil error:&error];

NSLog(@"link to london: %@", cities[@"london"][@"link"]);

>> link to london: http://www.London.co.uk

之后您必须使用提取的链接提供您的网页浏览。

自定义注释使用可能的JSON发送到webView？

1 个答案: