import "ViewController.h"

import <CoreLocation/CoreLocation.h>

import <MapKit/MapKit.h>

import "MKMapAnnotation.h"

@interface ViewController ()<MKMapViewDelegate, UITextFieldDelegate>

@property (weak, nonatomic) IBOutlet UIView *mapBackView;
@property (weak, nonatomic) IBOutlet UITextField *destinationTextField;
@property (weak, nonatomic) IBOutlet UIButton *showButton;
@property (weak, nonatomic) IBOutlet UIButton *jumpButton;
@property (weak, nonatomic) IBOutlet UILabel *errorMessageLabel;

@property (nonatomic, strong) CLGeocoder * geocoder;
@property (nonatomic, strong) MKMapView * mapView;
@property (nonatomic, strong) CLPlacemark * clDestinationPlacemark;
@property (nonatomic, strong) MKMapAnnotation * annotation;

@end

@implementation ViewController

• (void)viewDidLoad {
  [super viewDidLoad];
  // Do any additional setup after loading the view, typically from a nib.

  [self.showButton addTarget:self action:@selector(handleShow:) forControlEvents:UIControlEventTouchUpInside];
  [self.jumpButton addTarget:self action:@selector(handleJump:) forControlEvents:UIControlEventTouchUpInside];

  self.destinationTextField.delegate = self;

  self.geocoder = [[CLGeocoder alloc] init];

  self.mapView = [[MKMapView alloc] initWithFrame:self.mapBackView.bounds];
  self.mapView.showsUserLocation = NO;
  self.mapView.mapType = MKMapTypeStandard;
  /**

  • MKMapTypeStandard 标准地图
  • MKMapTypeSatellite 卫星地图
  • MKMapTypeHybrid 具有街道信息的卫星地图模式
    */
    self.mapView.delegate = self;
    [self.mapBackView addSubview:self.mapView];
    }

• (void)addMapViewRegion
  {
  MKCoordinateSpan theSpan;
  // 地图的范围越小越精确
  theSpan.latitudeDelta = 0.01;
  theSpan.longitudeDelta = 0.01;
  MKCoordinateRegion theRegion;
  theRegion.center = _clDestinationPlacemark.location.coordinate;
  theRegion.span = theSpan;
  [self.mapView setRegion:theRegion];

  _annotation = [[MKMapAnnotation alloc] init];
  _annotation.title = @"首都图书馆";
  _annotation.subtitle = @"你输入的地址没找到，可能在月球上";
  _annotation.coordinate = theRegion.center;
  [self.mapView addAnnotation:_annotation];
  }

pragma mark - 添加大头针 -

• (MKAnnotationView *)mapView:(MKMapView *)mapView viewForAnnotation:(id<MKAnnotation>)annotation
  {
  MKPinAnnotationView * pinView = nil;
  static NSString * defaultPinID = @"com.companylocation.pin";
  pinView = (MKPinAnnotationView *)[mapView dequeueReusableAnnotationViewWithIdentifier:defaultPinID];
  if (pinView == nil) {
  pinView = [[MKPinAnnotationView alloc] initWithAnnotation:annotation reuseIdentifier:defaultPinID];
  }
  pinView.pinColor = MKPinAnnotationColorRed;
  pinView.canShowCallout = YES;
  pinView.animatesDrop = YES;
  return pinView;
  }

• (void)handleShow:(UIButton *)sender
  {
  [self.destinationTextField resignFirstResponder];
  [self getDestinationCordinateWithName:self.destinationTextField.text withActionType:1];
  }

• (void)handleJump:(UIButton *)sender
  {
  if (!_clDestinationPlacemark) {
  [self getDestinationCordinateWithName:self.destinationTextField.text withActionType:2];
  } else {
  MKPlacemark * destinationPlaceMark = [[MKPlacemark alloc] initWithPlacemark:_clDestinationPlacemark];
  [self jumpToMapWithDestinationCordinate:destinationPlaceMark];
  }
  }

• (void)getDestinationCordinateWithName:(NSString *)destinationName withActionType:(NSInteger)actionType
  {
  // 1、get destination address
  NSString * address = destinationName;
  if (address.length != 0) {

    // 2、begin geocode
    // geocode with method below, the method in block will be called no matter success or fail
    [self.geocoder geocodeAddressString:address completionHandler:^(NSArray *placemarks, NSError *error) {
        
        // 如果有错误信息，或者是数组中获取的地名元素数量为0，说明没有找到
        if (error || placemarks.count == 0) {
            
            self.errorMessageLabel.text = @"你输入的地址没找到，可能在月球上";
            
        } else {
            // 编码成功，找到了具体的位置信息
            // 打印查看找到的所有的位置信息
            /**
             *  name: 名称
             *  locality: 城市
             *  country: 国家
             *  postalCode: 邮政编码
             */
            _clDestinationPlacemark = [placemarks firstObject];
            if (actionType == 2) {
                
                MKPlacemark * destinationPlaceMark = [[MKPlacemark alloc] initWithPlacemark:_clDestinationPlacemark];
                [self jumpToMapWithDestinationCordinate:destinationPlaceMark];
                
            } else if (actionType == 1) {
                
                [self addMapViewRegion];
            }
        }
    }];
  

  }
  }

• (void)jumpToMapWithDestinationCordinate:(MKPlacemark *)destinationPlacemark
  {
  MKMapItem * currentLocation = [MKMapItem mapItemForCurrentLocation];
  MKMapItem * toLocation = [[MKMapItem alloc] initWithPlacemark:destinationPlacemark];
  toLocation.name = self.destinationTextField.text;
  [MKMapItem openMapsWithItems:[NSArray arrayWithObjects:currentLocation, toLocation, nil] launchOptions:[NSDictionary dictionaryWithObjects:[NSArray arrayWithObjects:MKLaunchOptionsDirectionsModeDriving, [NSNumber numberWithBool:YES], nil] forKeys:[NSArray arrayWithObjects:MKLaunchOptionsDirectionsModeKey, MKLaunchOptionsShowsTrafficKey, nil]]];
  }

• (BOOL)textFieldShouldReturn:(UITextField *)textField
  {
  [self.destinationTextField resignFirstResponder];
  return YES;
  }

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

@end