MKUserLocation自定义视图不动!

Question

我为用户位置创建了一个自定义MKAnnotationView:

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

{

if ([annotation isKindOfClass:[MKUserLocation class]]) {

    if (navStatus == NavStatusHeadingEnabled) {

        if ([annotation isKindOfClass:[MKUserLocation class]]) {

            locationView = [[CustomLocationView alloc] initWithAnnotation:annotation reuseIdentifier:@"locationIdentifier"];
            return locationView;

        }

    }

    return nil;

}

CustomLocationView.h

       - (id)initWithAnnotation:(id <MKAnnotation>)annotation reuseIdentifier:(NSString *)reuseIdentifier
    {
        self = [super initWithAnnotation:annotation reuseIdentifier:reuseIdentifier];
        if (self != nil)
        {


            self.backgroundColor = [UIColor clearColor];
            blueDot = [UIImage imageNamed:@"userLocationDot.png"].CGImage;
            CGImageRetain(blueDot);

            CGPoint blueDotCenter = CGPointMake((self.frame.size.width - (CGImageGetWidth(blueDot) / 2)) / 2, (self.frame.size.height - (CGImageGetHeight(blueDot) / 2)) / 2);

            blueDotLayer = [CALayer layer];
            blueDotLayer.frame = CGRectMake(blueDotCenter.x, blueDotCenter.y , CGImageGetWidth(blueDot) / 2, CGImageGetHeight(blueDot) / 2);
            blueDotLayer.contents = (id)blueDot;
            blueDotLayer.shadowOpacity = 0.4;
            blueDotLayer.shadowColor = [UIColor blackColor].CGColor;
            blueDotLayer.shadowOffset = CGSizeMake(0.4, 0.3);
            blueDotLayer.shadowRadius = 1.0f;

            [self.layer insertSublayer:blueDotLayer above:self.layer];

        }

        return self;
    }

- (void)setAnnotation:(id <MKAnnotation>)annotation
{
    [super setAnnotation:annotation];

    [self setNeedsDisplay];
}





- (void)dealloc {

    [blueDotLayer release];


    [super dealloc];
}

问题是它只是停留在同一个地方而不像蓝点那样移动.我做错了什么？

谢谢比尔.

Answer 1

我刚刚遇到了这个问题.我不确定这是否是预期的行为,但无论出于何种原因,我们都应该移动我们的自定义MKUserLocation注释视图.

一个天真的解决方案是

- (void) locationController: (LocationController *) locationController
        didUpdateToLocation: (CLLocation *) location
{
    [[self mapView] setShowsUserLocation:NO];

    [[self mapView] setShowsUserLocation:YES];
}

但是这使得当前位置注释在屏幕周围跳跃,我发现这是不合需要的.

更好的是在视图控制器中将自定义注释视图的引用保持为ivar然后执行:

- (void) locationController: (LocationController *) locationController
        didUpdateToLocation: (CLLocation *) location
{
    CGPoint newCenterPoint = [[self mapView] convertCoordinate:[location coordinate] toPointToView:[[self customAnnotationView] superview]];
    newCenterPoint.x += [[self customAnnotationView] centerOffset].x;
    newCenterPoint.y += [[self customAnnotationView] centerOffset].y;

    [UIView animateWithDuration:0.3f animations:^{
        [[self customAnnotationView] setCenter:newCenterPoint];
    }];

}

这很好,除非您更改缩放级别时注释保持在相对于地图视图的rect的位置,然后仅在缩放或平移完成后才动画到正确的位置.最好遵循Apple的主导并使当前位置注释消失并在区域更改期间重新出现:

- (void)mapView:(MKMapView *)mapView regionWillChangeAnimated:(BOOL)animated
{
    [[self mapView] setShowsUserLocation:NO];
}

- (void)mapView:(MKMapView *)mapView regionDidChangeAnimated:(BOOL)animated
{
    [[self mapView] setShowsUserLocation:YES];
}

Answer 2

账单，

您需要一个已使用适用的desiredAccuracy 和distanceFilter 进行初始化的CLLocationManager，然后实现适用的委托方法，并将您自己的代码设置为locationManager 实例上的委托。

至少，您应该具有以下方法，位置管理器在确定所需精度中的当前位置后将调用该方法，然后每当满足 distanceFilter 时再次调用该方法。

- (void)locationManager:(CLLocationManager *)manager didUpdateToLocation:(CLLocation *)newLocation fromLocation:(CLLocation *)oldLocation ;

干杯，麦克