如何从通过MKAnnotationView添加的按钮获取单击事件

Question

任何人都知道是否有办法从button添加的点击事件中获取MKAnnotationView,这button被用作标签只是为了显示每个图钉的名称map,现在我成功地显示了一个自定义view(包含图像,文本.... )pin单击时,我需要在单击按钮(标签)时执行相同的操作.

感谢您提供的任何建议.

为代码button在MKAnnotationView:

UIButton * pinButton = [[UIButton alloc] initWithFrame:CGRectMake(0, 0, 140, 28)];
[pinButton.titleLabel setTextColor:[UIColor colorWithRed:255/255.0 green:255/255.0 blue:255/255.0 alpha:1]]; 
[pinButton setCenter:CGPointMake(pinAnnotationView.center.x + 70, pinAnnotationView.center.y + 10)]; 
[pinButton addTarget:self action:@selector(pinLabelClicked) forControlEvents:UIControlEventTouchUpInside]; 
[pinAnnotationView addSubView:pinButton]; 
[pinButton setUserInteractionEnabled:YES];

Answer 1

标准UI方法是使用callout视图并添加附件按钮作为progrmr显示.

但是,如果你必须直接添加一个按钮MKAnnotationView,你的方法的问题是它MKPinAnnotationView的默认框架(不能轻易改变)小于你添加的按钮,所以大部分按钮都不会响应触摸即使你切换到使用MKAnnotationView和增加帧大小,MKMapView将阻止按钮进行任何触摸.

你需要做的是UITapGestureRecognizer在按钮上添加一个(使用手势处理程序的动作方法而不是按钮上的addTarget)并将按钮添加到MKAnnotationView具有适当帧大小的平面而不是MKPinAnnotationView.

例:

- (MKAnnotationView *)mapView:(MKMapView *)mapView 
        viewForAnnotation:(id<MKAnnotation>)annotation
{
    MKAnnotationView *annView = (MKAnnotationView *)[mapView 
            dequeueReusableAnnotationViewWithIdentifier: @"pin"];
    if (annView == nil)
    {
        annView = [[[MKAnnotationView alloc] initWithAnnotation:annotation 
                      reuseIdentifier:@"pin"] autorelease];

        annView.frame = CGRectMake(0, 0, 200, 50);

        UIButton *pinButton = [UIButton buttonWithType:UIButtonTypeRoundedRect];
        pinButton.frame = CGRectMake(0, 0, 140, 28);
        pinButton.tag = 10;

        UITapGestureRecognizer *tap = [[UITapGestureRecognizer alloc] 
            initWithTarget:self action:@selector(handlePinButtonTap:)];
        tap.numberOfTapsRequired = 1;
        [pinButton addGestureRecognizer:tap];
        [tap release];

        [annView addSubview:pinButton]; 
    }

    annView.annotation = annotation;

    UIButton *pb = (UIButton *)[annView viewWithTag:10];
    [pb setTitle:annotation.title forState:UIControlStateNormal];

    return annView;
}

- (void) handlePinButtonTap:(UITapGestureRecognizer *)gestureRecognizer 
{
    UIButton *btn = (UIButton *) gestureRecognizer.view;
    MKAnnotationView *av = (MKAnnotationView *)[btn superview];
    id<MKAnnotation> ann = av.annotation;
    NSLog(@"handlePinButtonTap: ann.title=%@", ann.title);
}

请注意,这将阻止映射视图的didSelectAnnotationView委托方法触发.如果您需要触发该方法(除了按钮的手势处理程序方法),请添加以下内容:

//in the view controller's interface:
@interface YourVC : UIViewController <UIGestureRecognizerDelegate>

//where the UITapGestureRecognizer is created:
tap.delegate = self;

- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer 
        shouldRecognizeSimultaneouslyWithGestureRecognizer
            :(UIGestureRecognizer *)otherGestureRecognizer
{
    return YES;
}