我目前有一个tableViewCell,上面有一个按钮,按下时会出现一个复选标记。我正在尝试将UIButton的状态保存到NSUserDefaults。还有一个单独的viewController,其中一个单元格有一个X按钮,用于删除NSUserDefaults中保存的UIButton状态。我试过这个 但它似乎不适用于tableViewCell。这是我目前的代码:
自定义按钮:
class SaveButton: UIButton {
// Images
let buttonChecked = UIImage(named: "save_icon_greenCheck")
let buttonUnChecked = UIImage(named: "save_icon_white")
//Bool Property
override var selected: Bool{
didSet{
if selected {
self.setImage(buttonChecked, forState: UIControlState.Normal)
}else{
self.setImage(buttonUnChecked, forState: UIControlState.Normal)
}
NSUserDefaults.standardUserDefaults().setObject(selected, forKey: "isBtnChecked")
// NSUserDefaults.standardUserDefaults().synchronize()
}
}
override init(frame: CGRect){
super.init(frame:frame)
self.layer.masksToBounds = true
self.setImage(buttonUnChecked, forState: UIControlState.Normal)
self.addTarget(self, action: "buttonClicked:", forControlEvents: UIControlEvents.TouchUpInside)
}
required init(coder aDecoder: NSCoder) {
super.init(coder: aDecoder)!
}
func buttonClicked(sender: UIButton) {
self.selected = !self.selected
}
}
TableViewCell:
class TvShowCell: UITableViewCell {
@IBOutlet var MainPosterImage: UIImageView!
@IBOutlet var MainTitleLabel: UILabel!
@IBOutlet var imageWrapper: UIView!
@IBOutlet weak var saveButton: SaveButton!
override func awakeFromNib() {
saveButton.selected = NSUserDefaults.standardUserDefaults().boolForKey("isBtnChecked") // here we obtain the last state of the button
}
@IBAction func saveButtonPressed(sender: AnyObject) {
sender.setImage(UIImage(named: "save_icon_greenCheck"), forState: UIControlState.Normal)
}
}
IBAction删除UIButtonState:
@IBAction func removeSavedObject(sender: AnyObject) {
let searchTermsData = myDefaults.objectForKey(SAVED_SHOWS_KEY) as? NSData
let searchTermsArray = NSKeyedUnarchiver.unarchiveObjectWithData(searchTermsData!) as? [TvShowInfo]
favoriteShowsArray = searchTermsArray!
let location: CGPoint = sender.convertPoint(CGPointZero, toView: self.favoritesTableView)
let indexPath: NSIndexPath = self.favoritesTableView.indexPathForRowAtPoint(location)!
showToRemove = favoriteShowsArray[indexPath.row]
//save UIButtonState here
let save = SaveButton()
save.selected = false
myDefaults.setObject(save, forKey: "isBtnChecked")
let savedData = NSKeyedArchiver.archivedDataWithRootObject(favoriteShowsArray)
myDefaults.setObject(savedData, forKey: SAVED_SHOWS_KEY)
myDefaults.synchronize()
favoritesTableView.reloadData()
}
答案 0 :(得分:1)
为什么不保存按钮状态而不是尝试保存整个按钮?后者不起作用,因为当您尝试将整个对象保存到NSUSerDefaults时,您需要将其归档。相反,您可以将选定状态保存为bool,因为它是默认类型,因此不需要存档。 因此,当选择按钮时,只需将选定状态保存为bool而不是对象。
override var selected: Bool{
didSet{
if selected {
self.setImage(buttonChecked, forState: UIControlState.Normal)
}else{
self.setImage(buttonUnChecked, forState: UIControlState.Normal)
}
NSUserDefaults.standardUserDefaults().setBool(selected, forKey: "isBtnChecked")
}
}
然后在你的@IBAction
中删除按钮的状态,而不是创建一个按钮对象,将其设置为未选中,然后保存它,只需执行以下操作:
NSUserDefaults.standardUserDefaults.setBool(false, forKey: "isBtnChecked")
由于您在故事板中创建了单元格,因此您应该像这样进行初始化:
override init(style: UITableViewCellStyle, reuseIdentifier: String?) {
super.init(style: style, reuseIdentifier: reuseIdentifier)
saveButton.selected = NSUserDefaults.standardUserDefaults().boolForKey("isBtnChecked")
}
required init?(coder aDecoder: NSCoder) {
super.init(coder: aDecoder)
}
答案 1 :(得分:0)
我认为你从awakeFromNib()
做的事情会在cellforrowforinindexpath
中尝试。
希望这会奏效:)