检索表格视图单元格中的标签的所有孩子价值
我想检索Cake的所有孩子价值蛋糕价格标签。
我想检索,但我不能安排正确的代码,也是我入门级的ios。检索表格视图单元格中的标签的所有孩子价值
火力地堡结构
的ViewController
TestTableViewCell
import UIKit
class TestTableViewCell: UITableViewCell {
@IBOutlet weak var cakeImage: UIImageView!
@IBOutlet weak var cakeEngLabs: UILabel!
@IBOutlet weak var cakeUrLabs: UILabel!
@IBOutlet weak var cakeRateLabs: UILabel!
}
* TestTableViewController **
import UIKit
import Firebase
class TestTableViewController: UITableViewController {
@IBOutlet var cakeTableView: UITableView!
var ref = FIRDatabase.database().reference()
struct Cake {
let cakeEngNames: String
let cakeUrNames: String
let cakeImages: UIImage
var cakeRates: String
}
var cakes = [Cake(cakeEngNames: "almond Cake", cakeUrNames: "badam cake", cakeImages: UIImage(named:"Maru")!, cakeRates: ""),
Cake(cakeEngNames: "Jelly Cake", cakeUrNames: "jeli ka cake", cakeImages: UIImage(named:"spices")!, cakeRates: ""),
Cake(cakeEngNames: "Jelly Cake", cakeUrNames: "jeli ka cake", cakeImages: UIImage(named:"spices")!, cakeRates: ""),
Cake(cakeEngNames: "Jelly Cake", cakeUrNames: "jeli ka cake", cakeImages: UIImage(named:"spices")!, cakeRates: "")]
override func viewDidLoad() {
super.viewDidLoad()
let AlmondSnap = ref.child("Hyderabad").child("Bakery").child("Cake")
AlmondSnap.observe(.value, with: { (snapshot) in
let almondRate = snapshot.value as! String
self.cakes[].cakeRates = almondRate
print("\(almondRate)")
self.tableView.reloadData()
})
}
override func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return self.cakes.count
}
override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = self.tableView.dequeueReusableCell(withIdentifier: "TestTableViewCell", for: indexPath) as! TestTableViewCell
cell.cakeImage.image = self.cakes[indexPath.row].cakeImages
cell.cakeEngLabs.text = self.cakes[indexPath.row].cakeEngNames
cell.cakeUrLabs.text = self.cakes[indexPath.row].cakeUrNames
cell.cakeRateLabs.text = self.cakes[indexPath.row].cakeRates
return cell
}
}
因此,根据评论,如你所说,你只需要使用cakename和它的速率来填写表格。其他则是静态的(如果不是,请参阅@dstepan建议的结构和答案)。所以,这里是如何填充tableview中的数据。
var cakes = [Cake]()
override func viewDidLoad() {
super.viewDidLoad()
let almondSnap = ref.child("Hyderabad").child("Bakery").child("Cake")
almondSnap.observe(.value, with: { (snapshot) in
if snapshot.hasChildren(){
for snap in snapshot.children {
// snap.key produces name of cake
// snap.value produces rate of cake
if let node = snap as? FIRDataSnapshot, let rate = node.value as? Int {
self.cakes.append(Cake(cakeEngNames: node.key,
cakeUrNames: "badam cake",
cakeImages: UIImage(named:"Maru")!,
cakeRates: String(rate)))
}
}
self.cakeTableView.reloadData()
}
})
}
如果你存储在NSMutableArray中的所有值使用此
cell.cakeRateLbl.text = “Almon Cake Rate :\(self.cakesArray[0].objectForKey(“Hyderabad”).objectAtIndex(0).objectForKey(“Bakery”).ObjectAtIndex(0).objectForKey(“Cake”).objectAtIndex(0).valueForKey(“Almon_Cake”) as! Int)\nAzna Mental Cake Rate :\(self.cakesArray[0].objectForKey(“Hyderabad”).objectAtIndex(0).objectForKey(“Bakery”).ObjectAtIndex(0).objectForKey(“Cake”).objectAtIndex(0).valueForKey(“Azna_Mental_Cake”) as! Int)\nBlack Forest Cake Rate :\(self.cakesArray[0].objectForKey(“Hyderabad”).objectAtIndex(0).objectForKey(“Bakery”).ObjectAtIndex(0).objectForKey(“Cake”).objectAtIndex(0).valueForKey(“Black_Forest_Cake”) as! Int)”
或者你可以试试这个
cell.cakeRateLbl.text = “Almon Cake Rate :\(self.cakes[indexpath.row].Almond_Cake)\nAzna Mental Cake Rate :\(self.cakes[indexpath.row].Azna_Mental_Cake)\nBlack Forest Cake Rate :\(self.cakes[indexpath.row].Black_Forest_Cake)”
这是一个答案?如果是这样,你可以解释它,并格式化,所以它是可读的吗? – Jay
为了在单一标签中获得所有价格细节,我们首先需要将字符串中的所有值快速转换为AnyObject,例如我们需要简单地获得Almon Cake的价格let almonCakePirce =“\(self.cakesArray [0] .objectForKey(“海得拉巴”)。objectAtIndex(0).objectForKey(“Bakery”)。ObjectAtIndex(0).objectForKey(“Cake”)。objectAtIndex(0).valueForKey(“Azna_Mental_Cake”)as! Int)“'现在整数转换为字符串,如果我们需要添加另一个值到该字符串意味着添加字符串之间的”\ n“ –
@GaneshManickam有很多错误,请帮助我改进这些错误和警告分离声明 –
由于目前构建,你可以a CCESS您Cake
节点如下图所示:
var cakes: [Cake] = []
override func viewDidLoad() {
super.viewDidLoad()
let AlmondSnap = ref.child("Hyderabad").child("Bakery").child("Cake")
AlmondSnap.observe(.value, with: { (snapshot) in
for item in snapshot.children {
if let cakeFromDatabase = item as? FIRDataSnapshot {
let cake = Cake()
cake.cakeRates = cakeFromDatabase.value // for "Almond_Cake" this will be 800
cakes.append(cake)
}
}
self.tableView.reloadData()
})
}
但是,你很可能从制作一对夫妇的设计改变你目前的做法的基础上,我所看到的受益。
你的数据库结构,大概应该是
dgrproject-ac0e7
-- Hyderabad
-- Bakery
-- Cakes
-- id1
-- name: Almond Cake
-- rate: 800
等。
然后,在你的代码,你可以做以下
var cakes: [Cake] = [] {
didSet {
self.tableView.reloadData()
}
}
override func viewDidLoad() {
super.viewDidLoad()
let AlmondSnap = ref.child("Hyderabad").child("Bakery").child("Cake")
AlmondSnap.observe(.value, with: { (snapshot) in
let allCakes = []
for item in snapshot.children {
if let cakeFromDatabase = item as? FIRDataSnapshot {
let cake = Cake()
cake.cakeEngNames = cakeFromDatabase["name"] as? String
cake.cakeRates = cakeFromDatabase["rate"] as? Int
allCakes.append(cake)
}
}
cakes = allCakes
})
}
添加didSet
你的蛋糕阵列,只要你设置cakes
现在会自动刷新的tableView。这会清理代码在Firebase调用的完成处理程序中。我们还创建了一个allCakes
数组,以便我们不会将一个新的Cake
对象附加到cakes
,并导致在数据集增长时可能重新加载表视图数百次。
希望这会有所帮助!
我不太清楚你在问什么。当你运行现在的代码时会发生什么?你想要发生什么? –
我想在Testtabnleviewcontroller中检索'Cake'的所有孩子值到ckae数组,因此它可以出现在viewcopntroller的cakreratelabel中 –
现在,你的蛋糕是在'var cakes'数组中。你是说,不是用四个硬编码的蛋糕填充这个数组,而是想从数据库中检索它? –