Objective-C MapKit的使用-LBS简单的租车主界面demo

效果

分析

• 三个view：地图view、车辆信息view、车辆类型选择view

• 地图view：大头针的摆放，根据不同的种类显示大头针
• 车辆信息view：根据当前点击的大头针显示对应的车辆信息
• 车辆类型选择view：选择车辆类型

• 交互分析

• 选择车辆类型，地图上出现不同的大头针
• 车辆信息view可滑动，滑动完成后地图定位到当前车辆的大头针上

• view的搭建

• 车辆选择view：自定义slider 分段滑竿（上一篇文章提到过）
• 车辆信息View：使用uicollectionView的流水布局，做出分页效果
• mapView:自定义大头针，根据类型选择不同的大头针图片

• 参数的传递

• 模拟数据通过编写1.plist完成
• 读取plist数据,通过选择车辆类型,将筛选出来的数据使用模型数组存放,通过set方法传递给mapView和车辆信息view，并刷新界面
• 选择车辆信息view 通过代理将当前显示的车辆信息页传递给mapview并定位
• mapview有两个委托方法,点击空白处和点击大头针两个方法,用来设置车辆选择view和车辆信息view的显隐

代码

数据模型

• 数据模型及KVC使用

#import <Foundation/Foundation.h>

//车类型
typedef NS_ENUM(NSInteger, CarType) {
    CarTypeNone = -1,        //默认大头针
    CarTypeDaily,           //日租
    CarTypeHourly,          //时租
    CarTypeLong,            //长租
    CarTypeTestDrive,       //试驾
};
@interface CarModel : NSObject
@property(nonatomic,strong)NSDictionary *location;      //经纬度
@property(nonatomic,assign)NSString *carType;             //车类型
@property(nonatomic,copy)NSString *carName;             //车名称
@property(nonatomic,copy)NSString *price;               //价格
@property(nonatomic,copy)NSString *distance;            //与用户的距离
@property(nonatomic,copy)NSString *locationName;        //当前位置名
@property(nonatomic,copy)NSString *imageName;           //车图片
@property(nonatomic,copy)NSString *order;               //订单
@property(nonatomic,copy)NSString *banDay;              //限行
- (instancetype)initWithCarModelDict:(NSDictionary*)dict;
+ (instancetype)carModelWithDict:(NSDictionary*)ditc;
@end

自定义collectionview

使用xib的约束直接布局cell，cell外部公开carModel,用于赋值

• 给自定义的collectionview写一个委托，用来告诉controller当前选择cellitem

#import <UIKit/UIKit.h>
#import "CarModel.h"
@protocol CarInfoCollectionViewDelegate <NSObject>
- (void)selectItemArray:(NSArray*)array WithIndex:(NSInteger)index;
@end

@interface CarInfoCollectionView : UICollectionView
@property (nonatomic,strong)NSMutableArray<CarModel*> *carModelArray;
@property (nonatomic,strong)id<CarInfoCollectionViewDelegate> delegate2;
@end

• 界面呈现翻页效果 左右两边留上一页和下一页的边缘，需要计算停下的位置，使用UICollectionViewDelegate代理方法

//停下的位置
- (void)scrollViewWillEndDragging:(UIScrollView *)scrollView withVelocity:(CGPoint)velocity targetContentOffset:(inout CGPoint *)targetContentOffset
{
    UICollectionViewFlowLayout *layout = (UICollectionViewFlowLayout*)self.collectionViewLayout;
    //实际滑动的距离
    float pageWidth = layout.itemSize.width + layout.minimumLineSpacing;
    //当前位置
    float currentOffset = scrollView.contentOffset.x;
    //目标位置
    float targetOffset = targetContentOffset->x;
    float newTargetOffset = 0;
    int count = 0;
    if (targetOffset > currentOffset) {
        //向上取整
        count = ceilf(currentOffset / pageWidth);
        newTargetOffset = ceilf(currentOffset / pageWidth) * pageWidth;
    }else {
        //向下取整
        count = floorf(currentOffset / pageWidth);
        newTargetOffset = floorf(currentOffset / pageWidth) * pageWidth;

    }
    //处理边界
    if (newTargetOffset < 0)
        newTargetOffset = 0;
    else if (newTargetOffset > scrollView.contentSize.width)
        newTargetOffset = scrollView.contentSize.width;
    //设置目标位置指针
    targetContentOffset->x = currentOffset;
    //跳转新位置
    [scrollView setContentOffset:CGPointMake(newTargetOffset, 0) animated:YES];
}

• 当界面滚动完成时，通过代理通知controller当前的cellitem

- (void)scrollViewDidEndScrollingAnimation:(UIScrollView *)scrollView {
    UICollectionViewFlowLayout *layout = (UICollectionViewFlowLayout*)self.collectionViewLayout;
    //实际滑动的距离
    int pageWidth = layout.itemSize.width + layout.minimumLineSpacing;
    //当前位置
    int currentOffset = scrollView.contentOffset.x;
    int count = currentOffset / pageWidth;

    NSLog(@"滚完了 %d",count );
    if ([self.delegate2 respondsToSelector:@selector(selectItemArray:WithIndex:)]) {
        [self.delegate2 selectItemArray:self.carModelArray WithIndex:count];
    }
}

mapView

• 代理

#import <UIKit/UIKit.h>
#import <MapKit/MapKit.h>
#import "CarModel.h"
@protocol MapViewDelegate <NSObject>
//点击地图没有点到大头针
- (void)didSelectMapWithoutAnnotation;
//点到大头针
- (void)didSelectMapAnnotationViewWithCarArray:(NSMutableArray<CarModel *>*)carArray WithIndex:(NSInteger)index;
@end

@interface MapView : UIView
@property(nonatomic,strong)id<MapViewDelegate> delegate;
@property (nonatomic,strong)MKMapView *map;
//大头针数组
@property (nonatomic,strong)NSMutableArray *annotationArray;
//car数据模型数组
@property (nonatomic,strong)NSMutableArray<CarModel *> *carModelArray;
@end

• 使用到的全局变量

@interface MapView()<CLLocationManagerDelegate,MKMapViewDelegate>
@property (nonatomic,strong)CLLocationManager *locationManager;
@property (nonatomic,strong)UIButton *currentLocationBtn;
@property (nonatomic,strong)UIButton *zoomInBtn; //放大
@property (nonatomic,strong)UIButton *zoomOutBtn;//缩小
@property (nonatomic,strong)MyAnnotation *userLocationAnnotation;
@property (nonatomic,assign)int scale;
@end

• 初始化

//初始化
- (instancetype)initWithFrame:(CGRect)frame
{
    self = [super initWithFrame:frame];
    if (self) {

        self.carModelArray = [NSMutableArray array];
        [self loadingMapInfo];
        [self addSubview:self.map];
        [self addSubview:self.currentLocationBtn];
        [self addSubview:self.zoomInBtn];
        [self addSubview:self.zoomOutBtn];
    }
    return self;
}

• 全局变量使用懒加载
  
  需要提到的是当前位置的大头针的位置需要进行火星转码

//当前位置大头针
- (MyAnnotation *)userLocationAnnotation {
    if (!_userLocationAnnotation) {
        _userLocationAnnotation = [[MyAnnotation alloc] init];
        _userLocationAnnotation.type = CarTypeNone;
        //转火星坐标
        CLLocationCoordinate2D currentLocation = [WGS84TOGCJ02 transformFromWGSToGCJ:self.locationManager.location.coordinate];
        _userLocationAnnotation.coordinate = currentLocation;
        _userLocationAnnotation.title = @"我的位置";
    }
    return _userLocationAnnotation;
}

• 定位当前位置和放大缩小按钮的实现

//定位
- (UIButton *)currentLocationBtn {
    if (!_currentLocationBtn) {
        _currentLocationBtn = [[UIButton alloc] initWithFrame:CGRectMake(0, CGRectGetHeight(self.frame)*0.6, 50, 50)];
        [_currentLocationBtn setImage:[UIImage imageNamed:@"location_my.png"] forState:UIControlStateNormal];
        [_currentLocationBtn addTarget:self action:@selector(clickCurrentBtn) forControlEvents:UIControlEventTouchUpInside];
    }
    return _currentLocationBtn;
}
//点击定位
- (void)clickCurrentBtn {
    [self.map deselectAnnotation:self.userLocationAnnotation animated:NO];
    [self.map selectAnnotation:self.userLocationAnnotation animated:YES];
}
//放大
- (UIButton *)zoomInBtn {
    if (!_zoomInBtn) {
        _zoomInBtn = [[UIButton alloc] initWithFrame:CGRectMake(CGRectGetWidth(self.frame)-60, CGRectGetHeight(self.frame)*0.55, 50, 50)];
        [_zoomInBtn setImage:[UIImage imageNamed:@"zoomin.png"] forState:UIControlStateNormal];
        [_zoomInBtn addTarget:self action:@selector(mapZoomIn) forControlEvents:UIControlEventTouchUpInside];
    }
    return _zoomInBtn;
}
//放大方法
- (void)mapZoomIn {
    MKCoordinateRegion region = self.map.region;
    region.span.latitudeDelta = region.span.latitudeDelta * 0.5;
    region.span.longitudeDelta = region.span.longitudeDelta * 0.5;
    [self.map setRegion:region animated:YES];
}

//缩小
- (UIButton *)zoomOutBtn {
    if (!_zoomOutBtn) {
        _zoomOutBtn = [[UIButton alloc] initWithFrame:CGRectMake(CGRectGetWidth(self.frame)-60, CGRectGetMaxY(self.zoomInBtn.frame), 50, 50)];
        [_zoomOutBtn setImage:[UIImage imageNamed:@"zoomout.png"] forState:UIControlStateNormal];
        [_zoomOutBtn addTarget:self action:@selector(mapZoomOut) forControlEvents:UIControlEventTouchUpInside];
    }
    return _zoomOutBtn;
}

//缩小方法
- (void)mapZoomOut {
    MKCoordinateRegion region = self.map.region;
    region.span.latitudeDelta = region.span.latitudeDelta * 2;
    region.span.longitudeDelta = region.span.longitudeDelta * 2;
    [self.map setRegion:region animated:YES];
}

• 授权使用定位功能 info.plist上添加Privacy - Location Always Usage Description 值随便填

//获取授权
- (void)getAuthorization {
    //获取授权状态
    CLAuthorizationStatus status = [CLLocationManager authorizationStatus];
    if (status == kCLAuthorizationStatusNotDetermined) {
        [self.locationManager requestAlwaysAuthorization];
    } else if (status == kCLAuthorizationStatusAuthorizedAlways) {
        //不跟随用户
        self.map.userTrackingMode = MKUserTrackingModeNone;
    }
}

//授权后进入
- (void)locationManager:(CLLocationManager *)manager didChangeAuthorizationStatus:(CLAuthorizationStatus)status{
    //授权后开始定位
    [self.locationManager startUpdatingLocation];
    //加载地图信息
    [self loadData];
    [self loadingMapInfo];
}

• 公开变量设置set方法用于刷新地图大头针信息

//set方法
- (void)setCarModelArray:(NSMutableArray<CarModel *> *)carModelArray {

    for (MyAnnotation *an in self.map.annotations) {
        if (an.type != CarTypeNone) {
            [self.map removeAnnotation:an];
        }
    }
    [_carModelArray removeAllObjects];
    _carModelArray = carModelArray;

    //重新加载数据
    [self loadData];
}

//加载模拟数据
- (void)loadData {

    [self.annotationArray removeAllObjects];
    //完善model数据
    for (CarModel *model in self.carModelArray) {
        CLGeocoder *coder = [[CLGeocoder alloc] init];
        //model中的位置
        CLLocation *location = [[CLLocation alloc] initWithLatitude:[model.location[@"lat"] doubleValue] longitude:[model.location[@"long"] doubleValue]];
        //反地理编码 获得 经纬度 对应的 地名 并计算与当前位置的距离
        [coder reverseGeocodeLocation:location completionHandler:^(NSArray<CLPlacemark *> * _Nullable placemarks, NSError * _Nullable error) {
            CLPlacemark *mark = [placemarks firstObject];
            CLLocationCoordinate2D locatio = [WGS84TOGCJ02 transformFromWGSToGCJ:self.locationManager.location.coordinate];
            CLLocation *currentLocation =  [[CLLocation alloc] initWithLatitude:locatio.latitude longitude:locatio.longitude];
            CLLocationDistance dis = [location distanceFromLocation:currentLocation];

            model.locationName = mark.name;
            model.distance = [NSString stringWithFormat:@"%.2fkm",dis/1000];
        }];
    }

    int count = 0;
    //加载大头针
    for (CarModel *model in self.carModelArray) {

        MyAnnotation *annotation = [[MyAnnotation alloc] init];
        CLLocationCoordinate2D location = CLLocationCoordinate2DMake([model.location[@"lat"] doubleValue], [model.location[@"long"] doubleValue]);
        annotation.coordinate = location;
        annotation.index = count;
        annotation.type = [model.carType intValue];
        [self.map addAnnotation:annotation];
        [self.annotationArray addObject:annotation];
        count++;
    }
}

• mapview自身的代理方法，点击和取消大头针，实现回调跳转车辆信息view

#pragma mark - MKMapViewDelegate
//点击大头针
- (void)mapView:(MKMapView *)mapView didSelectAnnotationView:(MKAnnotationView *)view {
    //重置汽车原来的颜色
    NSArray *array = [mapView annotations];
    for (MyAnnotation *an in array) {
        MKAnnotationView *v = [mapView viewForAnnotation:an];
        if ([v.reuseIdentifier isEqualToString:@"carViewID"]) {
            v.image = [self getCarImageWithTypeInAnnotation:an];
        }
    }
    //点击小车换颜色
    if ([view.reuseIdentifier isEqualToString:@"carViewID"]) {
        view.image = [UIImage imageNamed:@"pickcar.png"];
        //代理回调 通知界面 将 carInfoView 出现 carPickView消失
        if ([self.delegate respondsToSelector:@selector(didSelectMapAnnotationViewWithCarArray:WithIndex:)]) {
            [self.delegate didSelectMapAnnotationViewWithCarArray:self.carModelArray WithIndex:((MyAnnotation*)view.annotation).index];
        }
        //设置中心点和范围
        [self.map setRegion:MKCoordinateRegionMakeWithDistance(((MyAnnotation*)view.annotation).coordinate, 2000, 2000) animated:NO];

    }
    else {
        [self.map setRegion:MKCoordinateRegionMakeWithDistance(self.userLocationAnnotation.coordinate, 2000, 2000) animated:YES];
    }
}

//没有选中大头针
- (void)mapView:(MKMapView *)mapView didDeselectAnnotationView:(MKAnnotationView *)view {
    //重置汽车原来的颜色
    NSArray *array = [mapView annotations];
    for (MyAnnotation *an in array) {
        MKAnnotationView *v = [mapView viewForAnnotation:an];
        if ([v.reuseIdentifier isEqualToString:@"carViewID"]) {
            v.image = [self getCarImageWithTypeInAnnotation:an];
        }
    }
    if ([view.reuseIdentifier isEqualToString:@"carViewID"]) {
        //代理回调 通知界面 将 carInfoView 消失 carPickView出现 小车变为未选中
        if ([self.delegate respondsToSelector:@selector(didSelectMapWithoutAnnotation)]) {
            [self.delegate didSelectMapWithoutAnnotation];
        }
    }
}

• 自定义大头针 当前位置使用标注 其他位置使用自定义的大头针视图

//当前位置大头针
- (MKPinAnnotationView*)customLocalAnnotationView:(id<MKAnnotation>)annotation {
    static NSString *locationID = @"locationViewID";
    //从缓存池中获取大头针
    MKPinAnnotationView *pinView = ( MKPinAnnotationView *)[self.map dequeueReusableAnnotationViewWithIdentifier:locationID];
    if (pinView == nil) {
        pinView  = [[MKPinAnnotationView alloc] initWithAnnotation:annotation reuseIdentifier:locationID];
    }
    pinView.annotation = annotation;
    // 取消气泡显示
    pinView.canShowCallout = YES;
    // 设置大头针是否有下落动画
    pinView.animatesDrop = YES;
    return pinView;

}

//自定义大头针
- (MKAnnotationView*)customMKAnnotationView:(id<MKAnnotation>)annotation {
    //自定义大头针
    static NSString *carViewID = @"carViewID";
    //从缓存池中获取自定义大头针
    MKAnnotationView *annoView = [self.map dequeueReusableAnnotationViewWithIdentifier:carViewID];
    if (annoView == nil) {
        //缓存池中没有则创建
        annoView = [[MKAnnotationView alloc] initWithAnnotation:annotation reuseIdentifier:carViewID];
    }
    annoView.annotation = annotation;
    annoView.canShowCallout = NO;
    annoView.draggable = YES;
    annoView.image = [self getCarImageWithTypeInAnnotation:annotation];
    return annoView;
}

//根据大头针的类型返回图片
- (UIImage *)getCarImageWithTypeInAnnotation:(MyAnnotation*)annotation {
    switch (annotation.type) {
        case CarTypeDaily:
            return  [UIImage imageNamed:@"dailycar.png"];
            break;
        case CarTypeHourly:
            return [UIImage imageNamed:@"hourlycar.png"];
            break;
        case CarTypeLong:
            return [UIImage imageNamed:@"longcar.png"];
            break;
        case CarTypeTestDrive:
            return [UIImage imageNamed:@"testcar.png"];
            break;
        default:
            break;
    }
    return nil;
}

viewController主界面

• 将三个视图定义为全局 并使用懒加载
  
  collectionView使用流水布局，为显示翻页效果需要配合增加头尾空白

- (CarInfoCollectionView *)collectionView {
    if (!_collectionView) {
        UICollectionViewFlowLayout *layout = [[UICollectionViewFlowLayout alloc] init];
        layout.itemSize = CGSizeMake(kScreenWidth * 0.85, kScreenHeight*0.2);
        layout.minimumLineSpacing = kScreenWidth * 0.05;

        CGFloat referenceWidth = (kScreenWidth - layout.itemSize.width - 2*layout.minimumLineSpacing)/2 + layout.minimumLineSpacing;

        layout.headerReferenceSize = CGSizeMake(referenceWidth, 0);
        layout.footerReferenceSize = CGSizeMake(referenceWidth, 0);
        layout.scrollDirection = UICollectionViewScrollDirectionHorizontal;
        _collectionView = [[CarInfoCollectionView alloc] initWithFrame:CGRectMake(0, kScreenHeight*0.8, self.view.frame.size.width, kScreenHeight*0.2) collectionViewLayout:layout];
        _collectionView.hidden = YES;
        _collectionView.delegate2 = self;

    }
    return _collectionView;
}

- (MapView *)mapView {
    if (!_mapView) {
        _mapView = [[MapView alloc] initWithFrame:self.view.bounds];
        _mapView.delegate = self;
    }
    return _mapView;
}

- (CustomSlider *)carPickView {
    if (!_carPickView) {
        _carPickView = [[CustomSlider alloc] initWithFrame:CGRectMake(0, kScreenHeight*0.8, kScreenWidth, kScreenHeight*0.2)];
        _carPickView.backgroundColor = [UIColor whiteColor];
        _carPickView.sliderBarHeight = 10;
        _carPickView.numberOfPart = 4;
        _carPickView.partColor = [UIColor grayColor];
        _carPickView.sliderColor = [UIColor grayColor];
        _carPickView.thumbImage = [UIImage imageNamed:@"yuanxing.png"];
        _carPickView.partNameOffset = CGPointMake(0, -30);
        _carPickView.thumbSize = CGSizeMake(50, 50);
        _carPickView.partSize = CGSizeMake(20, 20);
        _carPickView.partNameArray = @[@"日租",@"时租",@"长租",@"试驾"];
        [_carPickView addTarget:self action:@selector(valuechange:) forControlEvents:UIControlEventValueChanged];
    }
    return  _carPickView;
}

- (void)viewDidLoad {
    [super viewDidLoad];

    [self.view addSubview:self.mapView];
    [self.view addSubview:self.collectionView];
    [self.view addSubview:self.carPickView];
    [self valuechange:self.carPickView];
}

• 从plist中加载数据

- (NSMutableArray<CarModel*> *) selectCarWithType:(CarType)type {
    NSMutableArray *resultArray = [NSMutableArray array];
    //读取数据
    NSString *path = [[NSBundle mainBundle] pathForResource:@"1" ofType:@"plist"];
    NSArray *array = [NSArray arrayWithContentsOfFile:path];

    //存数据
    for (NSDictionary *dict in array) {
        CarModel *model = [CarModel carModelWithDict:dict];
        if ([model.carType intValue] == type) {
            [resultArray addObject:model];
        }
    }
    return resultArray;
}

• 实现各种委托方法

- (void)valuechange:(CustomSlider*)sender {
    NSLog(@"%ld",(long)sender.value);
    self.mapView.carModelArray = [self selectCarWithType:sender.value];
    NSLog(@"%@",self.mapView.carModelArray);
}

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

//collectionview 滚动结束后 调用
- (void)selectItemArray:(NSArray *)array WithIndex:(NSInteger)index {

    MyAnnotation *an = self.mapView.annotationArray[index];
    [self.mapView.map selectAnnotation:an animated:YES];

}

#pragma mark - mapViewDelegate
//点击地图没有点到大头针
- (void)didSelectMapWithoutAnnotation {
    self.carPickView.hidden = NO;
    self.collectionView.hidden = YES;
}

//点到大头针
- (void)didSelectMapAnnotationViewWithCarArray:(NSMutableArray<CarModel *> *)carArray WithIndex:(NSInteger)index {

    self.collectionView.carModelArray = carArray;
    NSLog(@"cararraycoutn =  %lu",(unsigned long)carArray.count);
    //跳转到选择的车辆信息
    [self.collectionView selectItemAtIndexPath:[NSIndexPath indexPathForItem:index inSection:0] animated:YES scrollPosition:UICollectionViewScrollPositionCenteredHorizontally];

    //出现车辆信息动画
    self.carPickView.hidden = YES;
    self.collectionView.hidden = NO;
}

demo地址

https://github.com/gongxiaokai/EasyCarDemo