Question

问题
目前我正在尝试将自定义图像添加到AnnotationPoint。我目前有它工作，但我想添加圆形边缘。当我尝试设置代码maskToBounds = true时，我会抛出一个错误（我相信因为它是在主线程中调用的）。当我尝试创建一个临时的AnnotationView时，在viewDidLoad中我将它的masksToBounds属性设置为true，它可以工作，但只适用于1人图像，当我放大地图时它会消失。我想要帮助的是弄清楚如何解决错误

我尝试过什么

    //sets the pictures on the map from a url
    func mapView(mapView: MKMapView!, viewForAnnotation annotation: MKAnnotation!) -> MKAnnotationView! {
        if !(annotation is CustomPointAnnotation) {
            return nil
        }

        let reuseId = "Profile Picture"

        var anView = mapView.dequeueReusableAnnotationViewWithIdentifier(reuseId)
        if anView == nil {
            anView = MKAnnotationView(annotation: annotation, reuseIdentifier: reuseId)
            anView.canShowCallout = true
        }
        else {
            anView.annotation = annotation
        }

        //Set annotation-specific properties **AFTER**
        //the view is dequeued or created...
        let cpa = annotation as! CustomPointAnnotation
        if let url = NSURL(string: cpa.urlName) {
            if let data = NSData(contentsOfURL: url){
                anView.image =  UIImage(data: data)
            }

    }

        //resize the users friends profile pictures
        var cropSquare = CGRectMake(0, 0, anView.image.size.width / 3, anView.image.size.height / 3)
        UIGraphicsBeginImageContextWithOptions(cropSquare.size, false, 1.0)
        anView.image.drawInRect(cropSquare)
        anView.image = UIGraphicsGetImageFromCurrentImageContext()
        anView.layer.masksToBounds = true
        anView.layer.cornerRadius = 10

        return anView
}

错误
线程1：信号SIGABRT

Answer 1

    //make the images circles
    var imageView: UIImageView = UIImageView(image: anView.image)
    var layer: CALayer = CALayer()
    layer = imageView.layer
    layer.masksToBounds = true
    layer.cornerRadius = CGFloat(anView.image.size.width / 2)
    UIGraphicsBeginImageContext(imageView.bounds.size)
    layer.renderInContext(UIGraphicsGetCurrentContext())
    var roundedImage = UIGraphicsGetImageFromCurrentImageContext()
    anView.image = roundedImage
    UIGraphicsEndImageContext()

Swift MKAnnotationView maskToBounds抛出错误

1 个答案: