import UIKit
class DetailTableViewController: UITableViewController {
var restaurant: Restaurant!
@IBOutlet weak var imageView: UIImageView!
override func viewDidLoad() {
super.viewDidLoad()
imageView.image = UIImage(named: restaurant.image)
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
}
// MARK: - Table view data source
override func numberOfSectionsInTableView(tableView: UITableView) -> Int {
return 1
}
override func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return 4
}
override func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCellWithIdentifier("DetailCell", forIndexPath: indexPath) as! DetailTableViewCell
switch indexPath.row{
case 0:
cell.fieldLabel.text = "Restaurant Name"
cell.valueLabel.text = restaurant.name
case 1:
cell.fieldLabel.text = "Restaurant Type"
cell.valueLabel.text = restaurant.type
case 2:
cell.fieldLabel.text = "Restaurant Location"
cell.fieldLabel.text = restaurant.location
case 3:
cell.fieldLabel.text = "Visted?"
cell.fieldLabel.text = restaurant.isVisted ? "Yes":"No"
default:
cell.fieldLabel.text = ""
cell.valueLabel.text = ""
}
return cell
}
}
错误信息: fatal error: unexpectedly found nil while unwrapping an Optional value
(lldb)
物件
restaurant
没有初始化,而且后来tableView:cellForRowAtIndexPath
使用restaurant
对象时它也没有值,一个null
`物件在 unwrap 的時候會報錯。swift我沒有學過,不過根據 oc 的經驗和錯誤訊息大膽猜測,你只寫了從重用池裡取cell,如果重用池裡沒有,而你沒有創建,不知道對不?
錯誤翻譯:optional值拆包的時候發現是空值,在某種程度相當於是空指標的問題
可以找一下哪些值沒有初始化