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我想从MapKit注释(i)按钮切换到UITableViewCell。要做到这一点,我用下面的代码:从MapKit注解中接触到UITableViewCell,并轻轻一点Firebase
func mapView(_ mapView: MKMapView, annotationView view: MKAnnotationView, calloutAccessoryControlTapped control: UIControl) {
let annotation = view.annotation as! MKPointAnnotation
let uid = annotation.title
self.userkey = uid!
self.performSegue(withIdentifier: "showDetailFromMap", sender: self)
}
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
if segue.identifier == "showDetailFromMap" {
let detailTVC = segue.destination as! MediaDetailTableViewController
let value = self.userkey
print(value)
let ref2 = DatabaseReference.media.reference()
let query2 = ref2.queryOrdered(byChild: "uid").queryEqual(toValue: (value))
query2.observe(.childAdded, with: { snapshot in
let media = Media(dictionary: snapshot.value as! [String : Any])
print(snapshot.value)
self.media1 = media
})
detailTVC.media = media1
detailTVC.currentUser = currentUser
}
}
我在为印刷(user.uid)制成的tableViewController的cellForRow print语句,这是抛出一个“意外发现无”的火力点后,打印语句引用没有返回任何内容,所以我认为这是从一个firebase错误开始的。 Firebase查询未运行,因此媒体永远无法获得价值。我之前多次使用这种格式完成了成功的查询,但现在无法正常工作。任何想法为什么?