系统提供的pin只有红绿蓝三种,爱美的朋友都想自定义pin,可是自定义的pin有时候图片大小或图片指针的方向问题,往往在放大模式图片指针指向的终点不一样。MKAnnotationView系统有个参数可以调节, 打开头文件你会看到这样一段代码:
// By default, the center of annotation view is placed over the coordinate of the annotation. // centerOffset is the offset in pixels from the center of the annotion view. @property (nonatomic) CGPoint centerOffset;
现在你很清楚如何做了吧。
示例代码:
- (MKAnnotationView *)mapView:(MKMapView *)aMapView viewForAnnotation:(id <MKAnnotation>)annotation { if(![annotation isKindOfClass:[MyAnnotation class]]) // Don't mess user location return nil; MKAnnotationView *annotationView = [aMapView dequeueReusableAnnotationViewWithIdentifier:@"spot"]; if(!annotationView) { annotationView = [[MKAnnotationView alloc] initWithAnnotation:annotation reuseIdentifier:@"spot"]; annotationView.rightCalloutAccessoryView = [UIButton buttonWithType:UIButtonTypeDetailDisclosure]; [(UIButton *)annotationView.rightCalloutAccessoryView addTarget:self action:@selector(openSpot:) forControlEvents:UIControlEventTouchUpInside]; annotationView.enabled = YES; annotationView.canShowCallout = YES; annotationView.centerOffset = CGPointMake(7,-15); annotationView.calloutOffset = CGPointMake(-8,0); } // Setup annotation view annotationView.image = [UIImage imageNamed:@"pinYellow.png"]; // Or whatever return annotationView; }
本文介绍了如何通过调整MKAnnotationView的centerOffset属性来自定义地图上的标记。文章提供了示例代码,展示了如何设置图片和调整指针指向的位置。
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