更新答案
import UIKit
import CoreData
class ExerciseViewController: UIViewController, UITableViewDelegate, UITableViewDataSource, UIPickerViewDataSource, UIPickerViewDelegate {
override func viewDidLoad() {
super.viewDidLoad()
VDL()
//sets stepper configs
setsStepper.wraps = false
setsStepper.autorepeat = true
setsStepper.continuous = true
setsStepper.tintColor = UIColor.redColor()
setsStepper.minimumValue = 0
setsStepper.maximumValue = 500
setsStepper.value = 0
//reps stepper configs
repsStepper.wraps = false
repsStepper.autorepeat = true
repsStepper.continuous = true
repsStepper.tintColor = UIColor.orangeColor()
repsStepper.minimumValue = 0
repsStepper.maximumValue = 500
repsStepper.value = 0
exerciseTableView.reloadData()
}
var moc = (UIApplication.sharedApplication().delegate as! AppDelegate).managedObjectContext
var fetchedResultsController: NSFetchedResultsController?
@IBOutlet var exerciseTableView: UITableView!
@IBOutlet var daysPickerView: UIPickerView!
@IBOutlet var exerciseName: UITextField!
@IBOutlet var setsStepper: UIStepper!
@IBOutlet var repsStepper: UIStepper!
@IBOutlet var setsNumber: UILabel!
@IBOutlet var repsNumber: UILabel!
var namesArray = [String]()
var setsArray = [Int]()
var repsArray = [Int]()
var daysArray = [TrainingDay]()
var detailsArray = [TrainingDetails]()
func VDL () {
let fetchRequest = NSFetchRequest(entityName: "TrainingDay")
let sort = NSSortDescriptor(key: "dayIndex", ascending: true)
fetchRequest.sortDescriptors = [sort]
daysArray = (moc!.executeFetchRequest(fetchRequest, error: nil) as? [TrainingDay])!
if daysArray.count == 0 { // nothing there
let dayEntity = NSEntityDescription.entityForName("TrainingDay", inManagedObjectContext: moc!)
let days = ["Sunday", "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday"]
for (index, name) in enumerate(days) {
let newDay = TrainingDay(entity: dayEntity!, insertIntoManagedObjectContext: moc)
newDay.day = name
newDay.dayIndex = index
daysArray.append(newDay)
}
var error: NSError?
moc!.save(&error)
}
}
func appendTrainingDetailsToArray () {
let nameLabel = exerciseName.text
namesArray.append(nameLabel)
let numberOfSets = setsNumber.text?.toInt()
setsArray.append(numberOfSets!)
let numberOfReps = repsNumber.text?.toInt()
repsArray.append(numberOfReps!)
let row = daysPickerView.selectedRowInComponent(0)
let currentDay = daysArray[row]
let detailsEntity = NSEntityDescription.entityForName("TrainingDetails", inManagedObjectContext: moc!)
let trainingdetails = TrainingDetails(entity: detailsEntity!, insertIntoManagedObjectContext: moc)
trainingdetails.trainingDay = currentDay
var error: NSError?
moc?.save(&error)
if let err = error {
var status = err.localizedFailureReason
println("\(status)")
} else {
println("CURRENT SETTING: \(trainingdetails.trainingDay)")
}
}
@IBAction func doneButton(sender: AnyObject) {
appendTrainingDetailsToArray()
exerciseTableView.reloadData()
}
@IBAction func setsStepperAction(sender: UIStepper) {
println("\(Int(sender.value))")
setsNumber.text = Int(sender.value).description
}
@IBAction func repsStepper(sender: UIStepper) {
println("\(Int(sender.value))")
repsNumber.text = Int(sender.value).description
}
func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return namesArray.count
}
func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
let cellIdentifier = "exerciseCell"
var cell = tableView.dequeueReusableCellWithIdentifier(cellIdentifier) as? UITableViewCell
if cell == nil {
cell = UITableViewCell(style: UITableViewCellStyle.Value2, reuseIdentifier: cellIdentifier)
}
let row = indexPath.row
println("\(row)")
let details = detailsArray[indexPath.row]
cell!.textLabel!.text = details.exerciseName
cell?.detailTextLabel?.text = "Sets: #\(details.setsNumber) Reps: #\(details.repsNumber)"
return cell!
}
//PICKER VIEW DELEGATE AND DATASOURCE METHODS
func numberOfComponentsInPickerView(pickerView: UIPickerView) -> Int {
return 1
}
func pickerView(pickerView: UIPickerView, numberOfRowsInComponent component: Int) -> Int {
return daysArray.count
}
func pickerView(pickerView: UIPickerView, titleForRow row: Int, forComponent component: Int) -> String! {
let trainingDay = daysArray[row]
return trainingDay.day
}
func pickerView(pickerView: UIPickerView, didSelectRow row: Int, inComponent component: Int) {
let currentDay = daysArray[row]
let fetchRequest = NSFetchRequest(entityName: "TrainingDetails")
let predicate = NSPredicate(format: "trainingDay = %@", currentDay)
fetchRequest.predicate = predicate
let sort = NSSortDescriptor(key: "exerciseName", ascending: true)
fetchRequest.sortDescriptors = [sort]
detailsArray = (moc!.executeFetchRequest(fetchRequest, error: nil) as? [TrainingDetails])!
exerciseTableView.reloadData()
}
}
之前，我寻求帮助以便适应 UIPickerView。 正如@pbasdf 所说，代码需要进行一些调整以符合核心数据和选择器 View 。你可以在他的回答中看到他的解释!
最佳答案
有几个问题需要解决:
TrainingDay 实体
您在 awakeFromInsert 代码上走错了方向。它不会插入新对象；只要您插入新的 TrainingDay 对象，它就会运行。从我在你的代码中看到的情况来看，你实际上从未做过 insert new TrainingDays(这很幸运，因为 awakeFromInsert 会崩溃 - 你正在将一个字符串数组分配给一个字符串属性)。
您需要创建 7 个 TrainingDay 对象，一个对应一周中的每一天。由于这些不会改变，您可以在您的应用程序首次运行时作为一次性任务执行此操作，或者(正如我在下面所做的那样)在您尝试获取它们时“懒惰地”执行此操作。您不需要 awakeFromInsert 代码，但我建议向实体添加另一个属性，例如“dayIndex”，这将使您能够将 TrainingDay 对象排序为逻辑顺序。您的代码可能如下所示:
// load the TrainingDays data...
let fetchRequest = NSFetchRequest(entityName: "TrainingDay")
let sort = NSSortDescriptor(key: "dayIndex", ascending: true)
fetchRequest.sortDescriptors = [sort]
daysArray = (moc!.executeFetchRequest(fetchRequest, error: nil) as? [TrainingDay])!
if daysArray.count == 0 { // nothing there
let dayEntity = NSEntityDescription.entityForName("TrainingDay", inManagedObjectContext: moc!)
let days = ["Sunday", "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday"]
for (index, name) in enumerate(days) {
let newDay = TrainingDay(entity: dayEntity!, insertIntoManagedObjectContext: moc)
newDay.day = name
newDay.dayIndex = index
daysArray.append(newDay)
}
moc.save(&error)
}
您可以将其放入 viewDidLoad 或从 VDL 调用的函数中。然后您可以使用 daysArray 作为选择器 View 的数据源...
填充选择器 View
放弃 daysOfPickerView 并改用 daysArray...
//PICKER VIEW DELEGATE AND DATASOURCE METHODS
func numberOfComponentsInPickerView(pickerView: UIPickerView) -> Int {
return 1
}
func pickerView(pickerView: UIPickerView, numberOfRowsInComponent component: Int) -> Int {
return daysArray.count
}
func pickerView(pickerView: UIPickerView, titleForRow row: Int, forComponent component: Int) -> String! {
let trainingDay = daysArray[row]
return trainingDay.day
}
将 TrainingDetails 对象分配给正确的日期
在appendTrainingDetailsToArray 方法中，您需要确定当前在选择器 View 中选择了哪一天。为此，您需要为 pickerView 添加一个 @IBOutlet var 并将其连接到 Storyboard中。然后您可以访问它并设置 TrainingDetails 的关系...
let row = pickerView.selectedRowInComponent(0)
let currentDay = daysArray[row]
trainingDetails.trainingDay = currentDay
填充您的 TableView 目前您正在使用三个独立的数组。我只会使用一个:
var detailsArray = [TrainingDetails]()
然后使用 TrainingDetails 的属性填充表格 View 单元格，即。
func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
let cellIdentifier = "exerciseCell"
var cell = tableView.dequeueReusableCellWithIdentifier(cellIdentifier) as? UITableViewCell
if cell == nil {
cell = UITableViewCell(style: UITableViewCellStyle.Value2, reuseIdentifier: cellIdentifier)
}
let row = indexPath.row
let details = detailsArray[indexPath.row]
cell!.textLabel!.text = details.exerciseName
cell?.detailTextLabel?.text = "Sets: #\(details.setsNumber) Reps: #\(details.repsNumber)"
return cell!
}
同样修改其他 TableView 数据源方法以使用 detailsArray。
您的三个数组当前是使用 append... 方法构建的，但我认为您想要的是为所选日期使用正确的“TrainingDetails”填充 TableView ...
响应选择器 View 的变化
目前，每次选择器 View 更改时，您的代码似乎都会创建新的 TrainingDetails。相反，只需获取所选日期的 TrainingDetails，然后重新加载表:
func pickerView(pickerView: UIPickerView, didSelectRow row: Int, inComponent component: Int) {
let currentDay = daysArray[row]
let fetchRequest = NSFetchRequest(entityName: "TrainingDetails")
let predicate = NSPredicate(format: "trainingDay = %@", currentDay)
fetchRequest.predicate = predicate
let sort = NSSortDescriptor(key: "exerciseName", ascending: true)
fetchRequest.sortDescriptors = [sort]
detailsArray = (moc!.executeFetchRequest(fetchRequest, error: nil) as? [TrainingDetails])!
exerciseTableView.reloadData()
}
进一步的想法
你已经声明了一个 NSFetchedResultsController 但没有使用它。使用它而不是原始的 NSFetchRequest 是有意义的，因为它会自动响应您添加新的 TrainingDetails 并将它们添加到表中——而不是需要使用 reloadData()。但那是另一天......
另外，如果你能原谅我，你对可选值有点自由:!和 ？。我在复制你的代码的地方没有改变它们，但你可以整理它们。与上下文操作的 error 参数类似 - 它总是值得使用的。也就是说，我在没有在 Xcode 中测试它的情况下起草了上面的内容，所以如果我在某些地方犯了一些错误，请原谅我；希望你能看到这个想法。
关于ios - UIPickerView + 核心数据，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/32108846/