我在我的应用程序中设置了一个“评论”部分，用户可以选择他们想要在“1-5”等级上评分的星数，包括半星。当实际显示用户选择的星星数量时，一切正常，可以将选定的星数选入我的Firebase数据库，这是故障发生的地方。
例如，如果用户A选择了3颗星并提交它，当它出现在我的UITableViewCell中时，它会显示3颗星......那里的一切都很好。
如果另一个用户，让我们说用户B选择4星并提交它，我的UITableViewCell会更改用户A评论中显示的星星，所以现在它看起来（我的firebase数据库中的任何内容都没有更改它仍然将其读取为一个4星级和3星评级）好像有两个4星评级。
如果不清楚，那基本上就像Yelp
这是我尝试过的代码：
let half = UIImage(named: "zeroPointFive")
let full = UIImage(named: "selectedReviewStar")
if let x = review?.ratingNumber?.floatValue{
let number = String(x)
someReviewStars.text = number
//my attempt at using a switch to solve it
switch x {
case 0.50 : halfStar.image = half;print("we have a 0.5 here", x)
case 1.0 : halfStar.image = full;print("we have a 1.0 here", x)
default: return
}
//I created different views for each star and added a subview image to them
if someReviewStars.text == "0.0"{
someReviewStars.text = "No Stars"
}
if someReviewStars.text == "0.5"{
someReviewStars.text = ""
halfStar.image = half
}
if someReviewStars.text == "1.0"{
someReviewStars.text = ""
halfStar.isHidden = true
oneStar.image = full
}
if someReviewStars.text == "1.5"{
someReviewStars.text = ""
halfStar.isHidden = true
oneStar.image = full
onePointFiveStar.image = half
}
if someReviewStars.text == "2.0"{
someReviewStars.text = ""
halfStar.isHidden = true
oneStar.image = full
onePointFiveStar.isHidden = true
twoStar.image = full
}
if someReviewStars.text == "2.5"{
someReviewStars.text = ""
let oneStarFrame = CGRect(x: -226, y: 0, width: 19, height: 17)
let oneStarBackgroundImage = UIImageView(frame: oneStarFrame)
oneStarBackgroundImage.image = full
self.oneStar.insertSubview(oneStarBackgroundImage, at: 0)
let twoStarsFrame = CGRect(x: -206, y: 0, width: 17, height: 17)
let twoStarsBackgroundImage = UIImageView(frame: twoStarsFrame)
twoStarsBackgroundImage.image = full
self.twoStar.insertSubview(twoStarsBackgroundImage, at: 0)
let twoPointFiveFrame = CGRect(x: -186, y: 0, width: 10, height: 17)
let twoPointFiveBackgroundImage = UIImageView(frame: twoPointFiveFrame)
twoPointFiveBackgroundImage.image = half
self.twoPointFiveStar.insertSubview(twoPointFiveBackgroundImage, at: 0)
}
if someReviewStars.text == "3.0"{
someReviewStars.text = ""
let oneStarFrame = CGRect(x: -226, y: 0, width: 19, height: 17)
let oneStarBackgroundImage = UIImageView(frame: oneStarFrame)
oneStarBackgroundImage.image = full
self.oneStar.insertSubview(oneStarBackgroundImage, at: 0)
let twoStarsFrame = CGRect(x: -206, y: 0, width: 17, height: 17)
let twoStarsBackgroundImage = UIImageView(frame: twoStarsFrame)
twoStarsBackgroundImage.image = full
self.twoStar.insertSubview(twoStarsBackgroundImage, at: 0)
let theframe = CGRect(x: -186, y: 0, width: 19, height: 17)
self.threeStar.image?.draw(in: theframe)
self.threeStar.image = full
}
if someReviewStars.text == "3.5"{
someReviewStars.text = ""
let oneStarFrame = CGRect(x: -226, y: 0, width: 19, height: 17)
let oneStarBackgroundImage = UIImageView(frame: oneStarFrame)
oneStarBackgroundImage.image = full
self.oneStar.insertSubview(oneStarBackgroundImage, at: 0)
let twoStarsFrame = CGRect(x: -206, y: 0, width: 17, height: 17)
let twoStarsBackgroundImage = UIImageView(frame: twoStarsFrame)
twoStarsBackgroundImage.image = full
self.twoStar.insertSubview(twoStarsBackgroundImage, at: 0)
let threeFrame = CGRect(x: -186, y: 0, width: 19, height: 17)
let threeBackgroundImage = UIImageView(frame: threeFrame)
threeBackgroundImage.image = full
self.threeStar.insertSubview(threeBackgroundImage, at: 0)
let threePointFiveFrame = CGRect(x: -167, y: 0, width: 10, height: 17)
let threePointFiveBackgroundImage = UIImageView(frame: threePointFiveFrame)
threePointFiveBackgroundImage.image = half
self.threePointFiveStar.insertSubview(threePointFiveBackgroundImage, at: 0)
}
if someReviewStars.text == "4.0"{
someReviewStars.text = ""
let oneStarFrame = CGRect(x: -226, y: 0, width: 19, height: 17)
let oneStarBackgroundImage = UIImageView(frame: oneStarFrame)
oneStarBackgroundImage.image = full
self.oneStar.insertSubview(oneStarBackgroundImage, at: 0)
let twoStarsFrame = CGRect(x: -206, y: 0, width: 17, height: 17)
let twoStarsBackgroundImage = UIImageView(frame: twoStarsFrame)
twoStarsBackgroundImage.image = full
self.twoStar.insertSubview(twoStarsBackgroundImage, at: 0)
let threeFrame = CGRect(x: -186, y: 0, width: 19, height: 17)
let threeBackgroundImage = UIImageView(frame: threeFrame)
threeBackgroundImage.image = full
self.threeStar.insertSubview(threeBackgroundImage, at: 0)
let fourStarsFrame = CGRect(x: -167, y: 0, width: 19, height: 17)
let fourStarsBackgroundImage = UIImageView(frame: fourStarsFrame)
fourStarsBackgroundImage.image = full
self.fourStar.insertSubview(fourStarsBackgroundImage, at: 0)
}
if someReviewStars.text == "4.5"{
someReviewStars.text = ""
let oneStarFrame = CGRect(x: -226, y: 0, width: 19, height: 17)
let oneStarBackgroundImage = UIImageView(frame: oneStarFrame)
oneStarBackgroundImage.image = full
self.oneStar.insertSubview(oneStarBackgroundImage, at: 0)
let twoStarsFrame = CGRect(x: -206, y: 0, width: 17, height: 17)
let twoStarsBackgroundImage = UIImageView(frame: twoStarsFrame)
twoStarsBackgroundImage.image = full
self.twoStar.insertSubview(twoStarsBackgroundImage, at: 0)
let threeFrame = CGRect(x: -186, y: 0, width: 19, height: 17)
let threeBackgroundImage = UIImageView(frame: threeFrame)
threeBackgroundImage.image = full
self.threeStar.insertSubview(threeBackgroundImage, at: 0)
let fourStarsFrame = CGRect(x: -167, y: 0, width: 19, height: 17)
let fourStarsBackgroundImage = UIImageView(frame: fourStarsFrame)
fourStarsBackgroundImage.image = full
self.fourStar.insertSubview(fourStarsBackgroundImage, at: 0)
let fourPointFiveFrame = CGRect(x: -146, y: 0, width: 10, height: 17)
let fourPointFiveBackgroundImage = UIImageView(frame: fourPointFiveFrame)
fourPointFiveBackgroundImage.image = half
self.fourPointFiveStar.insertSubview(fourPointFiveBackgroundImage, at: 0)
}
if someReviewStars.text == "5.0"{
someReviewStars.text = ""
let oneStarFrame = CGRect(x: -226, y: 0, width: 19, height: 17)
let oneStarBackgroundImage = UIImageView(frame: oneStarFrame)
oneStarBackgroundImage.image = full
self.oneStar.insertSubview(oneStarBackgroundImage, at: 0)
let twoStarsFrame = CGRect(x: -206, y: 0, width: 17, height: 17)
let twoStarsBackgroundImage = UIImageView(frame: twoStarsFrame)
twoStarsBackgroundImage.image = full
self.twoStar.insertSubview(twoStarsBackgroundImage, at: 0)
let threeFrame = CGRect(x: -186, y: 0, width: 19, height: 17)
let threeBackgroundImage = UIImageView(frame: threeFrame)
threeBackgroundImage.image = full
self.threeStar.insertSubview(threeBackgroundImage, at: 0)
let fourStarsFrame = CGRect(x: -167, y: 0, width: 19, height: 17)
let fourStarsBackgroundImage = UIImageView(frame: fourStarsFrame)
fourStarsBackgroundImage.image = full
self.fourStar.insertSubview(fourStarsBackgroundImage, at: 0)
let fiveStarsFrame = CGRect(x: -146, y: 0, width: 19, height: 17)
let fiveStarsBackgroundImage = UIImageView(frame: fiveStarsFrame)
fiveStarsBackgroundImage.image = full
self.fiveStar.insertSubview(fiveStarsBackgroundImage, at: 0)
}
}
}
}
}
这是我的tableView
class loadingTableReview: UITableViewController {
let cellId = "cellId"
var selectedUsersProfile:User?
override func viewDidLoad() {
super.viewDidLoad()
tableView.register(UserCell.self, forCellReuseIdentifier: cellId)
observeUserReviews()
}
override func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return reviews.count
}
override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: cellId, for: indexPath) as! UserCell
let review = reviews[indexPath.row]
cell.review = review
return cell
}
var reviews = [Reviews]()
var reviewDictionary = [String: Reviews]()
func observeUserReviews(){
guard let uid = selectedUsersProfile?.id
else{
return
}
let ref = FIRDatabase.database().reference().child("user-reviews").child(uid)
ref.observe(.childAdded, with: {(snapshot) in
let reviewId = snapshot.key
let messageReference = FIRDatabase.database().reference().child("reviews").child(reviewId)
messageReference.observeSingleEvent(of: .value, with: {(snapshot) in
print(snapshot)
if let dictionary = snapshot.value as?[String: AnyObject]{
let review = Reviews()
review.setValuesForKeys(dictionary)
if let fromId = review.fromId{
self.reviewDictionary[fromId] = review
self.reviews.append(review)
self.reviews.sort(by: { (review1, review2) -> Bool in
return (review1.timeStamp?.intValue)! > (review2.timeStamp?.intValue)!
})
}
self.tableView.reloadData()
}
}, withCancel: nil)
}, withCancel: nil)
}
答案 0 :(得分：1)
我建议在单元格中有5个固定的图像视图，并根据评级值系统地设置其图像属性
例如：
starImage1.image = rating < 0.5 ? nil : rating < 1 ? half : full
starImage2.image = rating < 1.5 ? nil : rating < 2 ? half : full
starImage3.image = rating < 2.5 ? nil : rating < 3 ? half : full
starImage4.image = rating < 3.5 ? nil : rating < 4 ? half : full
starImage5.image = rating < 4.5 ? nil : rating < 5 ? half : full