iOS MKMapView 苹果原生地图实现用户当前位置方向跟随角（指向三角）

因为我们项目中是多地图模式的 之前产品看到别的地图上有用户位置指向角 我们苹果地图咋就没有捏
之后查看MKMapView API 确实没有把MKModernUserLocationView暴露出来给开发者使用 所以只好自己写一个贴在上面啦

先看效果

用户当前位置

实现

.h文件

#import 

@interface LHUserLocationHeadingView : UIView

- (void)startUpdatingHeading;

- (void)stopUpdatingHeading;

@end

.m文件

#import "LHUserLocationHeadingView.h"
#import 

@interface LHUserLocationHeadingView()

@property (nonatomic, strong) UIImageView *arrowImageView;

@property (nonatomic, strong) CLLocationManager *locationManager;

@end

@implementation AAUserLocationHeadingView

- (instancetype)initWithFrame:(CGRect)frame{
    
    if (self = [super initWithFrame:frame]) {
        
        [self commonInit];
        
    }
    return self;
    
}

- (UIImageView *)arrowImageView
{
    if (_arrowImageView == nil) {
        _arrowImageView = [[UIImageView alloc]initWithImage:[UIImage imageNamed:@"xz_loction_heading_arrow"]];
    }
    return _arrowImageView;
}

- (CLLocationManager *)locationManager
{
    if (_locationManager == nil) {
        _locationManager = [[CLLocationManager alloc]init];
        _locationManager.delegate = self;
    }
    return _locationManager;
}

- (void)commonInit{
    self.backgroundColor = [UIColor clearColor];
    self.arrowImageView.frame = self.frame;
    [self addSubview:self.arrowImageView];
    [self startUpdatingHeading];
}

- (void)startUpdatingHeading{
    [self.locationManager startUpdatingHeading];
}

- (void)stopUpdatingHeading{
    [self.locationManager stopUpdatingHeading];
}

#pragma mark -- CLLocationManagerDelegate
- (void)locationManager:(CLLocationManager *)manager didUpdateHeading:(CLHeading *)newHeading
{
    if (newHeading.headingAccuracy < 0)  return;
    
    CLLocationDirection heading = newHeading.trueHeading > 0 ? newHeading.trueHeading : newHeading.magneticHeading;
    CGFloat rotation =  heading/180 * M_PI;
    self.arrowImageView.transform = CGAffineTransformMakeRotation(rotation);
}

使用

在Map初始化时会掉用这个代理方法 可以判断是否时Map的私有对象UserLocationView 添加自定义的View在其上 切图找设计要 或者你随便加一个看一下效果

- (void)mapView:(MKMapView *)mapView didAddAnnotationViews:(NSArray *)views{
    
    if ([views.lastObject isKindOfClass:NSClassFromString(@"MKModernUserLocationView")]) {
        
        AAUserLocationHeadingView *headingView = [[AAUserLocationHeadingView alloc]initWithFrame:CGRectMake(0, 0, 36, 36)];
        headingView.center = CGPointMake(views.lastObject.width/2, views.lastObject.height / 2);
        headingView.tag = 312;
        if (![views.lastObject viewWithTag:312]) {
            [views.lastObject addSubview:headingView];
            _userHeadingView = headingView;
        }
        
    }  
}

//在Map不在屏幕显示时记得停止获取方向 进入时再开始
   [_userHeadingView startUpdatingHeading];
   [_userHeadingView stopUpdatingHeading];

//在跟随模式下记得隐藏 其他模式下显示
    _userHeadingView.hidden = YES;