我有一个基于 Firebase 数据填充的 UICollectionView。我创建了填充 UICollectionView 的自定义单元格:
import UIKit
import Material
class PollCell: CollectionViewCell {
var key: String? {
get {
return self.key
}
}
@IBOutlet weak var imageView: UIImageView!
@IBOutlet weak var pollQuestion: UILabel!
public required init?(coder aDecoder: NSCoder) {
super.init(coder: aDecoder)
}
}
我试图访问 UICollectionView 中单击的单元格的 pollQuestion 变量并将其传递给另一个 ViewController:
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
if segue.identifier == "toPoll" {
let pollViewController = segue.destination as! PollController
if let cell = sender as? PollCell {
pollViewController.passLabel.text = cell.pollQuestion.text
}
}
}
轮询控制器:
import UIKit
class PollController: UIViewController {
@IBOutlet weak var passLabel: UILabel!
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view.
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
}
更新:我已经修改了代码,现在收到错误
该应用程序在运行时崩溃,我正在尝试解决:
发生崩溃的原因是插座passLabel
尚未连接时prepare(for segue
叫做。
您必须在中声明一个(临时)变量PollController
并将标签设置为viewDidLoad
class PollController: UIViewController {
@IBOutlet weak var passLabel: UILabel!
var pass = ""
override func viewDidLoad() {
super.viewDidLoad()
passLabel.text = pass
}
...
In prepare(for segue
设置变量而不是text
标签的属性:
let pollViewController = segue.destination as! PollController
if let cell = sender as? PollCell {
pollViewController.pass = cell.pollQuestion.text
}
}
注意:不建议从view(细胞)。获取索引路径并从中读取信息model(数据源数组)。
本文内容由网友自发贡献,版权归原作者所有,本站不承担相应法律责任。如您发现有涉嫌抄袭侵权的内容,请联系:hwhale#tublm.com(使用前将#替换为@)