如何解决使用calloutAccessoryView作为新ViewController的segue发送方时,如何访问自定义批注属性?
override func prepare(for segue: UIStoryboardSegue,sender: Any?) {
// Make sure we are acting on the correct segue
if segue.identifier == "CreateJumpSpot",let jumpSpotCreatorControllerVC = segue.destination as? JumpSpotCreatorController {
// Set the delegate in the JumpSpotCreatorController we're navigating to
jumpSpotCreatorControllerVC.delegate = self
} else if segue.identifier == "JumpSpotInfo",let jumpSpotInfoVC = segue.destination as? JumpSpotInfoController {
if let senderAnnotationView = sender as? JumpSpotAnnotationView {
jumpSpotInfoVC.titleLabel.text = senderAnnotationView.annotation?.title as? String
jumpSpotInfoVC.imageView.image = senderAnnotationView.annotation.
}
}
}
我们在这里关注语句的“ else if”部分。我有一个自定义注释和注释视图。我使用用户单击以显示rightCalloutAccessoryView的.detaildisclosure版本的注释的属性,在要选择的视图控制器中填充标签和imageViews。但是,该发件人(rightCalloutAccessoryView的.detaildisclosure)仅允许我访问注释的标题和副标题。如您所见,当我进入image属性时,由于没有属性可访问,因此我停止了键入。如何访问自定义批注的属性?
解决方法
难道您不能像image
一样获得senderAnnotationView.annotation?.image
,就像您要获得title
一样吗?
PS:不要过多地依赖Xcode自动补全。有时效果并不理想。
,好吧,我知道了。我要做的就是调整代码,以便使注释本身具有常量,并将其转换为我的自定义类。这是代码:
override func prepare(for segue: UIStoryboardSegue,sender: Any?) {
// Make sure we are acting on the correct segue
if segue.identifier == "CreateJumpSpot",let jumpSpotCreatorControllerVC = segue.destination as? JumpSpotCreatorController {
// Set the delegate in the JumpSpotCreatorController we're navigating to
jumpSpotCreatorControllerVC.delegate = self
} else if segue.identifier == "JumpSpotInfo",let jumpSpotInfoVC = segue.destination as? JumpSpotInfoController {
if let senderAnnotationView = sender as? JumpSpotAnnotationView {
let senderAnnotation = senderAnnotationView.annotation as? JumpSpotAnnotation
jumpSpotInfoVC.titleLabel.text = senderAnnotation?.title
jumpSpotInfoVC.imageView.image = senderAnnotation?.image
jumpSpotInfoVC.descriptionLabel.text = senderAnnotation?.description
jumpSpotInfoVC.heightLabel.text = senderAnnotation?.estimatedHeight
jumpSpotInfoVC.warningsLabel.text = senderAnnotation?.warnings
}
}
}
关键行是:让senderAnnotation = senderAnnotationView.annotation为? JumpSpotAnnotation
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