调用系统导航

#import "ViewController.h"#import <MapKit/MapKit.h>@interface ViewController ()// 目的地的输入框@property (weak, nonatomic) IBOutlet UITextField *destinationField;/** *  点击按钮之后开始导航 */- (IBAction)navigate;@end@implementation ViewController- (IBAction)navigate {    // 1.拿到用户输入的目的地    NSString *destination = self.destinationField.text;    if (destination.length == 0) {        return;    }        // 2.地理编码    CLGeocoder *geocoder = [[CLGeocoder alloc] init];    [geocoder geocodeAddressString:destination completionHandler:^(NSArray *placemarks, NSError *error) {        if (placemarks.count == 0 || error) return ;                // 2.1.取出地理编码出的地标        CLPlacemark *clpm = [placemarks firstObject];                // 2.2.利用CLPlacemark来创建MKPlacemark        MKPlacemark *mkpm = [[MKPlacemark alloc] initWithPlacemark:clpm];                // 2.3.利用MKPlacemark来创建目的地的MKMapItem        MKMapItem *destinationItem = [[MKMapItem alloc] initWithPlacemark:mkpm];                // 2.4.拿到起点的MKMapItem        MKMapItem *sourceItem = [MKMapItem mapItemForCurrentLocation];                // 2.5.开始导航        [self startNavigateWithSourceItem:sourceItem destinationItem:destinationItem];    }];}/** *  开始导航 * *  @param sourceItem      起点的Item *  @param destinationItem 终点的Item */- (void)startNavigateWithSourceItem:(MKMapItem *)sourceItem destinationItem:(MKMapItem *)destinationItem{    // 1.将起点和终点item放入数组中    NSArray *items = @[sourceItem, destinationItem];        // 2.设置Options参数(字典)    NSDictionary *options = @{            MKLaunchOptionsDirectionsModeKey : MKLaunchOptionsDirectionsModeDriving,            MKLaunchOptionsMapTypeKey : @(MKMapTypeHybrid),            MKLaunchOptionsShowsTrafficKey : @YES                    };        // 3.开始导航    [MKMapItem openMapsWithItems:items launchOptions:options];}@end