MKMapView自定义pin大小不同，位置对齐问题

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; }