iOS地图导航功能实现

最简单快捷的方法使用高德地图uri，高德地图uri的具体使用可在高德地图官方网站看，使用非常简单

简单贴下部分代码

   NSString *urlStr = [NSString 
    self.webView = [[UIWebView alloc] initWithFrame:CGRectMake(0, 0, ScreenWidth, ScreenHeight-64)];
    NSURLRequest *request = [NSURLRequest requestWithURL:[NSURL URLWithString:[NSString encodeToPercentEscapeString: urlStr]]];
    [self.webView loadRequest:request];
    self.webView.delegate = self;
    [self.view addSubview:self.webView];

这种实现方式，点击导航的时候可以设置直接跳转到高德地图，但是如果用户没有安装高德地图的话，就直接跳转到App Store ，用户体验不是很好
所以后来需求改成，点击了立即导航让选择使用本地已经安装的地图

那么现在问题出现了，立即导航的按钮是高德web页面的方法，iOS 怎么监听事件呢，于是就搜索了各种方法，最后选择通过UIWebView 的代理方法监听

- (BOOL)webView:(UIWebView *)webView shouldStartLoadWithRequest:(NSURLRequest *)request navigationType:(UIWebViewNavigationType)navigationType 

webview 每次加载都会调用这个方法，可以通过request.url 来判断用户是否点击了立即导航按钮

代码如下

- (BOOL)webView:(UIWebView *)webView shouldStartLoadWithRequest:(NSURLRequest *)request navigationType:(UIWebViewNavigationType)navigationType {
    NSURL *url = [request URL];

    BOOL returnValue = YES;
    if ([url.absoluteString containsString:@"iosamap"] || [url.absoluteString containsString:@"amapuri://route/plan/"]) {
        NSLog(@"点击了导航======================%@",url.absoluteString);
        [self showSheetView];
       //注意不要直接  return NO;
        returnValue = NO;
    }
    if ([url.absoluteString  {
        returnValue = NO;
    }
    return returnValue;
}

立即导航的点击事件截取到之后，然后，在通过[UIApplication sharedApplication] canOpenURL: 方法来判断本地安装了哪些地图
高德地图：iosamap://
百度地图：baidumap://

高德，百度 ，苹果地图的跳转方法：本文中跳转到地图显示效果是这样的，需要传入终点的经纬度

//高德地图
- (void)openGaoDeMap{
    NSString *urlString = [[NSString stringWithFormat:@"iosamap://path?sourceApplication=applicationName&sid=BGVIS1&slat=%f&slon=%f&sname=我的位置&did=BGVIS2&dlat=%@&dlon=%@&dname=%@&dev=0&t=0",self.currentLocationLatitude,self.currentLocationLongitude,self.lat,self.lng,self.addressName] stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding];
    NSURL *myLocationScheme = [NSURL URLWithString:urlString];
    if ([[UIDevice currentDevice].systemVersion integerValue] >= 10) { //iOS10以后,使用新API
        [[UIApplication sharedApplication] openURL:myLocationScheme options:@{} completionHandler:^(BOOL success) { NSLog(@"scheme调用结束"); }];
    } else { //iOS10以前,使用旧API
        [[UIApplication sharedApplication] openURL:myLocationScheme];
    }
    
}
//百度地图
- (void)openBaiduMap {
    if ([[UIApplication sharedApplication] canOpenURL:[NSURL URLWithString:BAIDUMAP]]) {
        NSString *urlString = [[NSString stringWithFormat:@"baidumap://map/direction?origin={{我的位置}}&destination=latlng:%@,%@|name:%@&mode=driving&coord_type=bd09&origin_region=%@&destination_region=%@",self.lat, self.lng,self.addressName,@"",@""]stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding];
        if ([[UIApplication sharedApplication] canOpenURL:[NSURL URLWithString:urlString]]) {
            [[UIApplication sharedApplication] openURL:[NSURL URLWithString:urlString]];
        } else {
            [ToolKit showAlertMessage:@"" currentVc:self];
        }
    }
}

//苹果地图
- (void)openAppleMap {
//出发点的经纬度可以不传，默认是当前位置
//终点的位置
    CLLocationCoordinate2D tolocation = CLLocationCoordinate2DMake(纬度, 经度);
    MKMapItem *currentLocationItem = [MKMapItem mapItemForCurrentLocation];
    MKMapItem *toLocationItem = [[MKMapItem alloc] initWithPlacemark:[[MKPlacemark alloc] initWithCoordinate:tolocation addressDictionary:@{}]];
    toLocationItem.name = self.addressName;
    [MKMapItem openMapsWithItems:@[currentLocationItem, toLocationItem]
                   launchOptions:@{MKLaunchOptionsDirectionsModeKey:
                    MKLaunchOptionsDirectionsModeDriving,MKLaunchOptionsShowsTrafficKey: [NSNumber numberWithBool:YES]}];
    
}