ios 6 - MKAnnotationView 中的问题

Question

我正在创建 map 应用程序，我在 MKMap 上显示了 MKAnnotationView，我还没有为此创建任何子类，

我的 viewForAnnotation 委托(delegate)方法是:

- (MKAnnotationView *)mapView:(MKMapView *)mapView viewForAnnotation:(id <MKAnnotation>)annotation
{
    if ([annotation isKindOfClass:[MKUserLocation class]])
    {
        return nil;
    }
    else if ([annotation isKindOfClass:[MKPointAnnotation class]])
    {
        static NSString * const identifier = @"MyCustomAnnotation";

        MKAnnotationView* annotationView = [mapView dequeueReusableAnnotationViewWithIdentifier:identifier];

        if (annotationView)
        {
            annotationView.annotation = annotation;
        }
        else
        {
            annotationView = [[MKAnnotationView alloc] initWithAnnotation:annotation
                                                          reuseIdentifier:identifier];

        }
        annotationView.canShowCallout = YES;
        annotationView.image = [UIImage imageNamed:@"pin"];
        UIImageView *imgview=[[UIImageView alloc]initWithFrame:CGRectMake(0, 0, 50,50)];
        imgview.backgroundColor=[UIColor redColor];
        imgview.contentMode=UIViewContentModeScaleAspectFit;
        imgview.image=[UIImage imageNamed:@"bus"];
        imgview.backgroundColor=[UIColor clearColor];

        UIView *lftView=[[UIView alloc]initWithFrame:CGRectMake(0, 0, 50,50)];
        lftView.backgroundColor=[UIColor lightGrayColor];
        [lftView addSubview:imgview];

        UIButton* rightButton = [UIButton buttonWithType:UIButtonTypeInfoLight];
        [rightButton setTitle:annotation.title forState:UIControlStateNormal];
        annotationView.rightCalloutAccessoryView = rightButton;
        annotationView.leftCalloutAccessoryView=lftView;
        annotationView.draggable = YES;
        annotationView.tag=101;
        return annotationView;
    }
    return nil;
}

我的输出在 iOS 7 中是完美的:

但在 iOS 6 中，leftCalloutAccessoryView 是从 annotaionview 出来的，它显示如下:

那么我该如何在 iOS 6 中解决这个问题呢？

Answer 1

关于 leftCalloutAccessoryView 的文档说:

The view to display on the left side of the standard callout bubble. The default value of this property is nil. The left callout view is typically used to display information about the annotation or to link to custom information provided by your application. The height of your view should be 32 pixels or less.

似乎是 iOS7 的标注会自动调整附件 View 的大小，但 iOS6 的标注不会。

尝试将硬编码的 CGRects 更改为 32px 高度。