在iPhone上的MKMapView中移动注释时避免闪烁

Question

据我所知,没有办法移动注释而不删除并重新添加到MapView(也许我错了).

有没有办法阻止在删除和重新添加注释之间重新绘制MapView？现在,删除注释后重新绘制会导致没有注释的帧,因此它似乎闪烁.

我需要一个适用于iOS 3.1更新的解决方案.

谢谢

Answer 1

在iOS4中

[theAnnotation setCoordinate:newCoordinate];

Answer 2

我想出了如何使用下面的代码实现无闪烁注释"更新".在坚果壳中,您将新的引脚FIRST添加,然后删除旧的引脚.我还没有简化我的代码,但你会明白这个想法.

-(void)replacePin:(NSString *)title SubTitle:(NSString *)subTitle Location:(CLLocationCoordinate2D)location PinType:(MapAnnotationType)pinType Loading:(BOOL)loading Progress:(float)progress
{
    //Find and "decommission" the old pin... (basically flags it for deletion later)
    for (MyMapAnnotation *annotation in map.annotations) 
    {
        if (![annotation isKindOfClass:[MKUserLocation class]])
        {
            if ([annotation.title isEqualToString:title])
                annotation.decommissioned = YES;
        }
    }

    //add the new pin...
    MyMapAnnotation *stationPin = nil;
    stationPin = [[MyMapAnnotation alloc] initWithCoordinate:Location
                                              annotationType:pinType
                                                       title:title
                                                    subtitle:subTitle
                                                     loading:loading
                                              decommissioned:NO
                                                    progress:progress];
    [map addAnnotation:stationPin];
    [stationPin release];
}

然后,我打电话来搜索并删除任何退役的引脚:

- (MKAnnotationView *)mapView:(MKMapView *)mapView viewForAnnotation:(id <MKAnnotation>)annotation
{
    MKAnnotationView* annotationView = nil;

    if (![annotation isKindOfClass:[MKUserLocation class]])
    {
        MyMapAnnotation* annotation = (MyMapAnnotation*)annotation;

        //your own details...

        //delete any decommissioned pins...
        [self performSelectorOnMainThread:@selector(deletePin:) withObject:annotation.title waitUntilDone:NO];
    }
    return annotationView;

}

最后,在后台摆脱旧针:

-(void)deletePin:(NSString *)stationCode
{
    for (MyMapAnnotation *annotation in map.annotations) 
    {
        if (![annotation isKindOfClass:[MKUserLocation class]])
        {
            if ([annotation.title isEqualToString:stationCode])
            {  
                if (annotation.decommissioned)
                    [map removeAnnotation:annotation];
            }
        }
    }
}