【iOS开发-111】自定义大头针Annotation以及2种导航划线的方法介绍

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（1）自定义大头针Annotation的样式，也就是定义view，主要的方法是如下，传递一个大头针annotation模型，然后返回一个MKAnnotationView，这个MKAnnotationView有一个image属性，设置这个属性，就能设置它的样式了。

-(MKAnnotationView *)mapView:(MKMapView *)mapView viewForAnnotation:(id<MKAnnotation>)annotation{
}

关键提示，这个MKAnnotationView和tableViewCell类似，可以循环利用，先从mapView中取，取不到再创建。

主要代码：

#import "ViewController.h"
#import <MapKit/MapKit.h>
#import <CoreLocation/CoreLocation.h>
#import "WPAnnotation.h"

@interface ViewController ()<MKMapViewDelegate>
@property (weak, nonatomic) IBOutlet MKMapView *mapView;
@property(nonatomic,strong) CLLocationManager *locMgr;
@end

@implementation ViewController

-(CLLocationManager *)locMgr{
    if (_locMgr==nil) {
        _locMgr=[[CLLocationManager alloc]init];
    }
    return _locMgr;
}

- (void)viewDidLoad {
    [super viewDidLoad];
    if ([[UIDevice currentDevice].systemVersion doubleValue]>=8.0) {
        [self.locMgr requestWhenInUseAuthorization];
    }
    //设置代理
    self.mapView.delegate=self;
    //添加两个大头针
    WPAnnotation *anno0=[[WPAnnotation alloc]init];
    anno0.coordinate=CLLocationCoordinate2DMake(40, 116);
    anno0.title=@"全聚德";
    anno0.subtitle=@"全北京最好的烤鸭店";
    anno0.icon=@"category_1";
    [self.mapView addAnnotation:anno0];
    
    WPAnnotation *anno1=[[WPAnnotation alloc]init];
    anno1.coordinate=CLLocationCoordinate2DMake(39, 115);
    anno1.title=@"万达影院";
    anno1.subtitle=@"全中国最顶尖的观影圣地";
    anno1.icon=@"category_5";
    [self.mapView addAnnotation:anno1];
}

-(MKAnnotationView *)mapView:(MKMapView *)mapView viewForAnnotation:(id<MKAnnotation>)annotation{
    static NSString *ID=@"annoView";
    MKAnnotationView *annoView=[mapView dequeueReusableAnnotationViewWithIdentifier:ID];
    if (annoView==nil) {
        annoView=[[MKAnnotationView alloc]initWithAnnotation:annotation reuseIdentifier:ID];
        //点击大头针出现信息（自定义view的大头针默认点击不弹出）
        annoView.canShowCallout=YES;
    }
    //再传递一次annotation模型（赋值）
    annoView.annotation=annotation;
    
    WPAnnotation *anno=annotation;
    annoView.image=[UIImage imageNamed:anno.icon];
    
    return annoView;
}

@end

#import <Foundation/Foundation.h>
#import <MapKit/MapKit.h>

@interface WPAnnotation : NSObject<MKAnnotation>
@property (nonatomic, assign) CLLocationCoordinate2D coordinate;
@property (nonatomic, copy) NSString *title;
@property (nonatomic, copy) NSString *subtitle;
//自定义大头针图片
@property(nonatomic,copy) NSString *icon;
@end

//追踪用户位置
self.mapView.userTrackingMode=MKUserTrackingModeFollow;

主要原因是，追踪用户位置的MKUserLocation也是一个大头针（蓝色发光的那个圈圈），它也要经过viewForAnnotation这个代理方法返回自定义的大头针，但是它是没有icon属性的，所以报错。我们应该在viewForAnnotation中添加一个判断：

//如果是系统自带的大头针，则返回默认的，否则下面要设置icon时会报错，因为系统的大头针没有icon属性
if (![annotation isKindOfClass:[WPAnnotation class]]) return nil;

（3）还有一个MKPinAnnotationView是MKAnnotationView的子类，属性多2个，一个是设置颜色，就是可以设置大头针的颜色，还有一个是设置大头针从天而降。

- (void)viewDidLoad {
    [super viewDidLoad];
    ......
    [self.mapView addGestureRecognizer:[[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(tapMapView:)]];
}

-(void)tapMapView:(UITapGestureRecognizer *)tap{
    //获取点
    CGPoint point=[tap locationInView:tap.view];
    //点转坐标
    CLLocationCoordinate2D coordi=[self.mapView convertPoint:point toCoordinateFromView:self.mapView];
    WPAnnotation *anno=[[WPAnnotation alloc]init];
    anno.coordinate=coordi;
    anno.title=@"全聚德";
    anno.subtitle=@"来一只鸭子，老板！";
    [self.mapView addAnnotation:anno];
}

-(MKAnnotationView *)mapView:(MKMapView *)mapView viewForAnnotation:(id<MKAnnotation>)annotation{
    static NSString *ID=@"map";
    MKPinAnnotationView *annoView=(MKPinAnnotationView *)[mapView dequeueReusableAnnotationViewWithIdentifier:ID];
    if (annoView==nil) {
        annoView=[[MKPinAnnotationView alloc]initWithAnnotation:annotation reuseIdentifier:ID];
        //设置描述信息能点击出现
        annoView.canShowCallout=YES;
        //设置颜色
        annoView.pinColor=MKPinAnnotationColorGreen;
        //设置第一次出现从天而降
        annoView.animatesDrop=YES;
    }
    return annoView;
}

（4）自定义一个MKAnnotationView，并利用代理方法，监听大头针的点击，点击后，再弹出一个“大头针”（只不过这个大头针是自定义MkAnnotationView的）。

我们一般返回一个大头针视图，用下面这个类似于tableViewCell的方法。

-(MKAnnotationView *)mapView:(MKMapView *)mapView viewForAnnotation:(id<MKAnnotation>)annotation{
    if ([annotation isKindOfClass:[WPDescriptionAnnotation class]]) {
        WPAnnotationView *annoView=[WPAnnotationView annotationWithMapView:mapView];
        annoView.annotation=annotation;
        return annoView;
    }else if ([annotation isKindOfClass:[WPAnnotation class]]){
        WPTuanGouAnnotationView *annoView=[WPTuanGouAnnotationView annotationWithMapView:mapView];
        annoView.annotation=annotation;
        return annoView;
    }
    return nil;
}

//点击大头针，弹出一个自定义的大头针充当描述信息
-(void)mapView:(MKMapView *)mapView didSelectAnnotationView:(MKAnnotationView *)view{
    if (![view isKindOfClass:[WPTuanGouAnnotationView class]]) return;
    //删除所有再添加，保证只有1个，也防止重复
    for (id annotation in mapView.annotations) {
        if ([annotation isKindOfClass:[WPDescriptionAnnotation class]]) {
            [mapView removeAnnotation:annotation];
        }
    }
    WPAnnotation *anno=view.annotation;
    WPDescriptionAnnotation *descAnno=[[WPDescriptionAnnotation alloc]init];
    descAnno.tuangou=anno.tuangou;
    [mapView addAnnotation:descAnno];
}

for (WPTuanGou *tuan in self.tuangous) {
        WPAnnotation *anno=[[WPAnnotation alloc]init];
        anno.tuangou=tuan;
        [self.mapView addAnnotation:anno];
}

（5）导航划线

#import "ViewController.h"
#import <CoreLocation/CoreLocation.h>
#import <MapKit/MapKit.h>
#import "WPAnnotation.h"

@interface ViewController ()<MKMapViewDelegate>
@property (weak, nonatomic) IBOutlet MKMapView *mapView;
@property(nonatomic,strong) CLGeocoder *geocoder;

@end

@implementation ViewController

-(CLGeocoder *)geocoder{
    if (_geocoder==nil) {
        _geocoder=[[CLGeocoder alloc]init];
    }
    return _geocoder;
}

- (void)viewDidLoad {
    [super viewDidLoad];
    self.mapView.delegate=self;
    
    NSString *add1=@"广州";
    NSString *add2=@"北京";
    //这个方法只能生效1个，所以不能分开写
    [self.geocoder geocodeAddressString:add1 completionHandler:^(NSArray *placemarks, NSError *error) {
        if (error) return;
        CLPlacemark *fromPm=[placemarks firstObject];
        [self.geocoder geocodeAddressString:add2 completionHandler:^(NSArray *placemarks, NSError *error) {
            CLPlacemark *toPm=[placemarks firstObject];
            [self addLineFrom:fromPm to:toPm];
        }];
    }];
}

-(void)addLineFrom:(CLPlacemark *)fromPm to:(CLPlacemark *)toPm{
    //添加2个大头针
    WPAnnotation *anno0=[[WPAnnotation alloc]init];
    anno0.coordinate=fromPm.location.coordinate;
    [self.mapView addAnnotation:anno0];
    
    WPAnnotation *anno1=[[WPAnnotation alloc]init];
    anno1.coordinate=toPm.location.coordinate;
    [self.mapView addAnnotation:anno1];
    
    //设置方向请求
    MKDirectionsRequest *request=[[MKDirectionsRequest alloc]init];
    //设置起点终点
    MKPlacemark *sourcePm=[[MKPlacemark alloc]initWithPlacemark:fromPm];
    request.source=[[MKMapItem alloc]initWithPlacemark:sourcePm];
    MKPlacemark *destiPm=[[MKPlacemark alloc]initWithPlacemark:toPm];
    request.destination=[[MKMapItem alloc]initWithPlacemark:destiPm];
    //定义方向对象
    MKDirections *dirs=[[MKDirections alloc]initWithRequest:request];
    //计算路线
    [dirs calculateDirectionsWithCompletionHandler:^(MKDirectionsResponse *response, NSError *error) {
        NSLog(@"总共有%lu条线路",(unsigned long)response.routes.count);
        for (MKRoute *route in response.routes) {
            [self.mapView addOverlay:route.polyline];
        }
    }];
}

//划线就是添加路径，就是添加遮盖
-(MKOverlayRenderer *)mapView:(MKMapView *)mapView rendererForOverlay:(id<MKOverlay>)overlay{
    MKPolylineRenderer *renderer=[[MKPolylineRenderer alloc]initWithOverlay:overlay];
    renderer.strokeColor=[UIColor redColor];
    return renderer;
}

@end

    MKMapItem *from=[[MKMapItem alloc]initWithPlacemark:[[MKPlacemark alloc] initWithPlacemark:fromPm]];
    MKMapItem *to=[[MKMapItem alloc]initWithPlacemark:[[MKPlacemark alloc] initWithPlacemark:toPm]];
    NSMutableDictionary *options=[NSMutableDictionary dictionary];
    options[MKLaunchOptionsDirectionsModeKey]=MKLaunchOptionsDirectionsModeDriving;
    options[MKLaunchOptionsShowsTrafficKey]=@YES;
    [MKMapItem openMapsWithItems:@[from,to] launchOptions:options];

【iOS开发-111】自定义大头针Annotation以及2种导航划线的方法介绍

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原文地址：http://blog.csdn.net/weisubao/article/details/43205229