Add callouts to custom infoMarkerWindow implementa

问题:

I am using Google IOS SDK and have implemented

- (UIView *)mapView:(GMSMapView *)mapView markerInfoWindow:(GMSMarker *)marker

to implement a custom view. When I show this view, it does not add a callout as Google map view normally does for its own markers. Can anyone please let me know how it would be possible to add this callout like pointer pointing towards the marker for this custom makerInfoWindow ?

回答1:

Here is how to do it.

- (UIView *)mapView:(GMSMapView *)mapView markerInfoWindow:(GMSMarker *)marker{
    int popupWidth = 300;
    int contentWidth = 280;
    int contentHeight = 140;
    int contentPad = 10;
    int popupHeight = 200;
    int popupBottomPadding = 16;
    int popupContentHeight = contentHeight - popupBottomPadding;
    int buttonHeight = 30;
    int anchorSize = 20;
    CLLocationCoordinate2D anchor = marker.position;
    CGPoint point = [mapView.projection pointForCoordinate:anchor];


    UIView *outerView = [[UIView alloc] initWithFrame:CGRectMake(0, 0, popupWidth, popupHeight)];
    float offSet = anchorSize * M_SQRT2;
    CGAffineTransform rotateBy45Degrees = CGAffineTransformMakeRotation(M_PI_4); //rotate by 45 degrees
    UIView *callOut = [[UIView alloc] initWithFrame:CGRectMake((popupWidth - offSet)/2.0, popupHeight - offSet, anchorSize, anchorSize)];
    callOut.transform = rotateBy45Degrees;
    callOut.backgroundColor = [UIColor blackColor];
    [outerView addSubview:callOut];

    UIView *view = [[UIView alloc] initWithFrame:CGRectMake(0, 0, popupWidth, 190)];
    [view setBackgroundColor:[UIColor whiteColor]];

    view.layer.cornerRadius = 5;
    view.layer.masksToBounds = YES;

    view.layer.borderColor = [UIColor blackColor].CGColor;
    view.layer.borderWidth = 2.0f;



    UILabel *titleLabel = [[UILabel alloc] initWithFrame:CGRectMake(contentPad, 0, contentWidth, 22)];
    [titleLabel setFont:[UIFont systemFontOfSize:17.0]];
    titleLabel.text = [marker title];

    UILabel *descriptionLabel = [[UILabel alloc] initWithFrame:CGRectMake(contentPad, 24, contentWidth, 80)];
    [descriptionLabel setFont:[UIFont systemFontOfSize:12.0]];
    descriptionLabel.numberOfLines = 5;
    descriptionLabel.text = [marker snippet];

    [view addSubview:titleLabel];
    [view addSubview:descriptionLabel];


    [outerView addSubview:view];

    return outerView;

}

回答2:

This method is a GMSMapViewDelegate method, did you set the delegate to the view controller?

mapView.delegate = self;