[英]how to add custom callout view in mapview
我是objective-c中mapkit的新手。 我可以在 mapview 中添加自定義注釋。
我需要像下圖一樣放置自定義標注視圖
.
但我不知道如何設計這樣的標注視圖。
我知道我需要在視圖中為注釋方法添加標注。
- (MKAnnotationView *)mapView:(MKMapView *)map viewForAnnotation:(id <MKAnnotation>)annotation
{
static NSString *AnnotationViewID = @"annotationViewID";
MKAnnotationView *annotationView = (MKAnnotationView *)[mapview dequeueReusableAnnotationViewWithIdentifier:AnnotationViewID];
if (annotationView == nil)
{
annotationView = [[[MKAnnotationView alloc] initWithAnnotation:annotation reuseIdentifier:AnnotationViewID] autorelease];
}
annotationView.image = [UIImage imageNamed:@"blue_without_pin.png"];
annotationView.annotation = annotation;
return annotationView;
}
基本上你想要做的是通過在你的 MKMapViewDelegate 實例中實現以下方法來添加一個新的自定義視圖:
- (void)mapView:(MKMapView *)mapView didSelectAnnotationView:(MKAnnotationView *)view {
CGPoint annotationCenter = [mapView convertCoordinate:view.annotation.coordinate toPointToView:mapView];
[self displayCustomCalloutForAnnotation:view.annotation center:annotationCenter];
}
@interface CustomAnnotaionView : MKAnnotationView
@property (strong, nonatomic) UIView *calloutView;
-(void)setSelected:(BOOL)selected animated:(BOOL)animated;
@end
@implementation CustomAnnotaionView
@synthesize calloutView = _calloutView;
-(void)setSelected:(BOOL)selected animated:(BOOL)animated
{
[super setSelected:selected animated:animated];
if(selected)
{
[self.calloutView setFrame:CGRectMake(30, 130, 250, 135)];
[self.calloutView sizeToFit];
self.calloutView.backgroundColor = [UIColor colorWithPatternImage:[UIImage imageNamed:@"popup.png"]];
[self addSubview:self.calloutView];
}
else
{
[self.calloutView removeFromSuperview];
}
}
-(void)didAddSubview:(UIView *)subview
{
if([[[subview class]description]isEqualToString:@"UICalloutView"])
{
[subview removeFromSuperview];
}
}
Use this customAnnotationView class in MapView delegate method,
- (MKAnnotationView *)mapView:(MKMapView *)theMapView viewForAnnotation:(id
<MKAnnotation>)annotation
{
if([annotation isKindOfClass:[MapAnnotation class]])
{
CustomAnnotationView *annotationView = (CustomAnnotaionView*)[theMapView dequeueReusableAnnotationViewWithIdentifier:@"CustomAnnotationView"];
if(!annotationView)
{
MapAnnotation *annotation = (MapAnnotation *)annotation;
annotationView = [[CustomAnnotaionView alloc]initWithAnnotation:annotation reuseIdentifier:@"CustomAnnotationView"];
[annotationView setCanShowCallout:YES];
}
else
annotationView.annotation = annotation;
return annotationView;
}
return nil;
}
對此的一種解決方案是檢測所選注釋相對於父 UIView 的確切坐標,然后直接在 MKMapView 之上繪制 UIView。
這是一個可能有幫助的片段:
- (void)mapView:(MKMapView *)mapView didSelectAnnotationView:(MKAnnotationView *)view
{
CGPoint pointInMap = [self.mapView convertCoordinate:buildingAnnotation.coordinate
toPointToView:self.view];
// Hide the default callout generated by MKMapView
[mapView deselectAnnotation:view.annotation animated:NO];
// Create a custom callout view and center the arrow on the pointInMap CGPoint
}
您必須自己實現標注視圖,並使用
- (void)mapView:(MKMapView *)mapView didSelectAnnotationView:(MKAnnotationView *)view
這個委托使標注視圖顯示在正確的位置,
IOS 還沒有任何自定義標注視圖的方法
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