我正在关注本教程：http ://www.raywenderlich.com/13160/using-the-google-places-api-with-mapkit ，但由于某种原因我的应用程序正在返回：
谷歌数据：( )
这是我的 .h 文件：
#import <UIKit/UIKit.h>
#import <MapKit/MapKit.h>
#import <CoreLocation/CoreLocation.h>
#define kBgQueue dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0)
#define kGOOGLE_API_KEY @"API PLACED HERE, LEFT BLANK FOR STACKOVERFLOW"
@interface ViewController : UIViewController <MKMapViewDelegate, CLLocationManagerDelegate>
{
CLLocationManager *locationManager;
CLLocationCoordinate2D currentCentre;
int currenDist;
}
@property (strong, nonatomic) IBOutlet MKMapView *mapView;
@end
和我的实现文件：
#import "ViewController.h"
@interface ViewController ()
@end
@implementation ViewController
- (void)viewDidLoad
{
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
//Make this controller the delegate for the map view.
self.mapView.delegate = self;
// Ensure that you can view your own location in the map view.
[self.mapView setShowsUserLocation:YES];
//Instantiate a location object.
locationManager = [[CLLocationManager alloc] init];
//Make this controller the delegate for the location manager.
[locationManager setDelegate:self];
//Set some parameters for the location object.
[locationManager setDistanceFilter:kCLDistanceFilterNone];
[locationManager setDesiredAccuracy:kCLLocationAccuracyBest];
}
- (void)didReceiveMemoryWarning
{
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
- (IBAction)toolBarButtonPress:(UIBarButtonItem *)sender {
UIBarButtonItem *button = (UIBarButtonItem *)sender;
NSString *buttonTitle = [button.title lowercaseString];
[self queryGooglePlaces:buttonTitle];
}
-(void) queryGooglePlaces: (NSString *) googleType {
NSString *url = [NSString stringWithFormat:@"https://maps.googleapis.com/maps/api/place/search/json? location=%f,%f&radius=%@&types=%@&sensor=true&key=%@", currentCentre.latitude, currentCentre.longitude, [NSString stringWithFormat:@"%i", currenDist], googleType, kGOOGLE_API_KEY];
url = [url stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding];
NSLog(@"%@", url);
//Formulate the string as a URL object.
NSURL *googleRequestURL=[NSURL URLWithString:url];
// Retrieve the results of the URL.
dispatch_async(kBgQueue, ^{
NSData* data = [NSData dataWithContentsOfURL: googleRequestURL];
[self performSelectorOnMainThread:@selector(fetchedData:) withObject:data waitUntilDone:YES];
});
}
-(void)fetchedData:(NSData *)responseData {
//parse out the json data
NSError* error;
NSDictionary* json = [NSJSONSerialization
JSONObjectWithData:responseData
options:kNilOptions
error:&error];
//The results from Google will be an array obtained from the NSDictionary object with the key "results".
NSArray* places = [json objectForKey:@"results"];
//Write out the data to the console.
NSLog(@"Google Data: %@", places);
}
-(void)mapView:(MKMapView *)mapView regionDidChangeAnimated:(BOOL)animated {
//Get the east and west points on the map so you can calculate the distance (zoom level) of the current map view.
MKMapRect mRect = self.mapView.visibleMapRect;
MKMapPoint eastMapPoint = MKMapPointMake(MKMapRectGetMinX(mRect), MKMapRectGetMidY(mRect));
MKMapPoint westMapPoint = MKMapPointMake(MKMapRectGetMaxX(mRect), MKMapRectGetMidY(mRect));
//Set your current distance instance variable.
currenDist = MKMetersBetweenMapPoints(eastMapPoint, westMapPoint);
//Set your current center point on the map instance variable.
currentCentre = self.mapView.centerCoordinate;
}
#pragma mark - MKMapViewDelegate methods.
- (void)mapView:(MKMapView *)mv didAddAnnotationViews:(NSArray *)views {
MKCoordinateRegion region;
region = MKCoordinateRegionMakeWithDistance(locationManager.location.coordinate,1000,1000);
[mv setRegion:region animated:YES];
}
@end
我的最终格式化 URL 的控制台日志是：
https://maps.googleapis.com/maps/api/place/search/json? location=HIDDENLAT,HIDDENLONG&radius=995&types=bar&sensor=true&key=HIDDENAPI
我已经替换了上面生成的 lat、long 和 API 值，但它们被返回为正确的值？
我发现的另一个 SO 答案说要添加：
url = [url stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding];
我做了，但这对我不起作用？
任何想法为什么这不起作用！？我把头发拉出来试图把它弄出来！
谢谢！