MKPinAnnotationView自定义图像被带有动画下落的图钉替换 [英] MKPinAnnotationView custom Image is replaced by pin with animating drop

问题描述

我在MapView上显示用户头像图像。如果在没有动画的情况下渲染它们，它们似乎正在工作，但是我想为它们的动画制作动画。如果我将pinView.animatesDrop设置为true，那么我将丢失头像并将其替换为pin。如何在不使用pin的情况下为我的头像设置动画？

I'm displaying user avatar images on a MapView. The avatars appear to be working if they are rendered without animation, however I'd like to animate their drop. If I set pinView.animatesDrop to true, then I lose the avatar and it is replaced by the pin. How can I animate the drop of my avatar without using the pin?

这是我正在使用的viewForAnnotation方法：

Here is my viewForAnnotation method I'm using:

- (MKAnnotationView *)mapView:(MKMapView *)mapView viewForAnnotation:(id <MKAnnotation>)annotation {
    if ([annotation isKindOfClass:[MKUserLocation class]])
        return nil;

    MKPinAnnotationView* pinView = (MKPinAnnotationView*)[self.mapView dequeueReusableAnnotationViewWithIdentifier:@"MyAnnotation"];

    if (!pinView) {
        pinView = [[MKPinAnnotationView alloc] initWithAnnotation:annotation reuseIdentifier:@"CustomPinAnnotation"];
    }
    else
        pinView.annotation = annotation;

    //If I set this to true, my image is replaced by the pin
    //pinView.animatesDrop = true;

    //I'm using SDWebImage
    [pinView setImageWithURL:[NSURL URLWithString:@"/pathtosomeavatar.png"] placeholderImage:[UIImage imageNamed:@"placeholder.png"]];

    //Adding a nice drop shadow here
    pinView.layer.shadowColor = [UIColor blackColor].CGColor;
    pinView.layer.shadowOffset = CGSizeMake(0, 1);
    pinView.layer.shadowOpacity = 0.5;
    pinView.layer.shadowRadius = 3.0;

    return pinView;
}

推荐答案

当你想使用你的时候自己的注释视图图像，最好创建一个常规的 MKAnnotationView 而不是 MKPinAnnotationView 。

When you want to use your own image for an annotation view, it's best to create a regular MKAnnotationView instead of an MKPinAnnotationView.

由于 MKPinAnnotationView 是 MKAnnotationView 的子类，因此它具有图像属性，但它通常（通常在您不指望它时）忽略它并改为显示其内置图像。

Since MKPinAnnotationView is a subclass of MKAnnotationView, it has an image property but it generally (usually when you don't expect it) ignores it and displays its built-in pin image instead.

所以不要与它斗争，最好只使用普通的 MKAnnotationView 。

So rather than fighting with it, it's best to just use a plain MKAnnotationView.

你最重要的事情不使用输入MKPinAnnotationView 是你必须手动实现的内置掉落动画。

The big thing you lose by not using MKPinAnnotationView is the built-in drop animation which you'll have to implement manually.

参见以前的答案有关详细信息：

MKMapView：而不是注释引脚，自定义视图

See this previous answer for more details:
MKMapView: Instead of Annotation Pin, a custom view

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