【发布时间】：2017-01-20 18:15:08
【问题描述】：
斯威夫特 3，
我在我的 iOS 应用程序中使用 NSUserDefaults 来保存和加载 indexPath 以及发生操作的行的哪个部分。因为我的表格视图中的每一行都有一个按钮。在 ViewDidLoad 中重新加载表格时再次加载。
在 ViewDidLoad 中，我正在调用应该保存和加载任何内容的 fetch 函数。
func fetchData() {
// request from remote or local
data = [testArray]
// Update the items to first section has 0 elements,
// and place all data in section 1
items = [[], data ?? []]
// apply ordering
applySorting() { "\($0)" }
// save ordering
saveSorting() { "\($0)" }
// refresh the table view
myTableView.reloadData()
}
在我的 buttonAction 中，我使用了 saveSorting() 函数。
func saveSorting(_ dataIdBlock: (Any) -> String) {
guard let items = self.items else { return }
for (section, rows) in items.enumerated() {
for (row, item) in rows.enumerated() {
let indexPath = IndexPath(row: row, section: section)
let dataId = dataIdBlock(item)
let ordering = DataHandling(dataId: dataId, indexPath: indexPath)
ordering.save(defaults: indexPath.defaultsKey)
}
}
}
这是我的断点图片，显示了日志以及它在代码中中断的位置。
感谢您在修复此崩溃方面提供的帮助。该应用程序甚至不加载它在应用程序完全加载之前停留在白屏。谢谢。
这里是代码
class DataHandling: NSObject, NSCoding {
var indexPath: IndexPath?
var dataId: String?
init(dataId: String, indexPath: IndexPath) {
super.init()
self.dataId = dataId
self.indexPath = indexPath
}
required init(coder aDecoder: NSCoder) {
if let dataId = aDecoder.decodeObject(forKey: "dataId") as? String {
self.dataId = dataId
}
if let indexPath = aDecoder.decodeObject(forKey: "indexPath") as? IndexPath {
self.indexPath = indexPath
}
}
func encode(with aCoder: NSCoder) {
aCoder.encode(dataId, forKey: "dataId")
aCoder.encode(indexPath, forKey: "indexPath")
}
func save(defaults box: String) -> Bool {
let defaults = UserDefaults.standard
let savedData = NSKeyedArchiver.archivedData(withRootObject: self)
defaults.set(savedData, forKey: box)
return defaults.synchronize()
}
convenience init?(defaults box: String) {
let defaults = UserDefaults.standard
if let data = defaults.object(forKey: box) as? Data,
let obj = NSKeyedUnarchiver.unarchiveObject(with: data) as? DataHandling,
let dataId = obj.dataId,
let indexPath = obj.indexPath {
self.init(dataId: dataId, indexPath: indexPath)
} else {
return nil
}
}
class func allSavedOrdering(_ maxRows: Int) -> [Int: [DataHandling]] {
var result: [Int: [DataHandling]] = [:]
for section in 0...1 {
var rows: [DataHandling] = []
for row in 0..<maxRows {
let indexPath = IndexPath(row: row, section: section)
if let ordering = DataHandling(defaults: indexPath.defaultsKey) {
rows.append(ordering)
}
rows.sort(by: { $0.indexPath! < $1.indexPath! })
}
result[section] = rows
}
return result
}
}
错误代码：
*** Terminating app due to uncaught exception 'NSInvalidUnarchiveOperationException', reason: '*** -[NSKeyedUnarchiver decodeObjectForKey:]: cannot decode object of class (CustomCellSwift.DataOrdering) for key (root); the class may be defined in source code or a library that is not linked'
JSON 代码
func retrieveData() {
let getDataURL = "http://ip/test.org/Get.php"
let url: NSURL = NSURL(string: getDataURL)!
do {
let data: Data = try Data(contentsOf: url as URL)
jsonArray = try JSONSerialization.jsonObject(with: data, options: .mutableContainers) as! NSMutableArray
// Looping through jsonArray
for i in 0..<jsonArray.count {
// Create Test Object
let gID: String = (jsonArray[i] as AnyObject).object(forKey: "id") as! String
let gName: String = (jsonArray[i] as AnyObject).object(forKey: "gameName") as! String
// Add Test Objects to Test Array
testArray.append(Test(gameTest: tName, andTestID: tID))
}
}
catch {
print("Error: (Getting Data)")
}
myTableView.reloadData()
}
应用排序代码
func applySorting(_ dataIdBlock: (Any) -> String) {
// get all saved ordering
guard let data = self.data else { return }
let ordering = DataHandling.allSavedOrdering(data.count)
var result: [[Any]] = [[], []]
for (section, ordering) in ordering {
guard section <= 1 else { continue } // make sure the section is 0 or 1
let rows = data.filter({ obj -> Bool in
return ordering.index(where: { $0.dataId == .some(dataIdBlock(obj)) }) != nil
})
result[section] = rows
}
self.items = result
}
【问题讨论】：
-
可以添加崩溃日志和
DataHandling类吗？ -
实际的错误信息是什么？
-
@Ryan 如何获取崩溃日志？它只是说（lldb），我上传了代码。
-
@l'L'l 它的一个断点崩溃，显示没有错误
-
也许您的默认值中有旧数据？您是否从
UserDefaults重新开始并清理了所有内容？ （因为它试图解码一个完全不同的类CustomCellSwift.DataOrdering，您尝试将其转换为DataHandling）
标签： ios swift uitableview crash nskeyedarchiver