Question

我试图添加一个简单的键盘通知，但收到一个＆＃34; EXC_BAD_INSTRUCTION＆＃34;每当我运行代码时出错。任何帮助表示赞赏。

NSNotificationCenter.defaultCenter().addObserver(self, selector: "keyBoardWillShow:", name: UIKeyboardWillShowNotification, object: nil)
    NSNotificationCenter.defaultCenter().addObserver(self, selector: "keyBoardWillHide:", name: UIKeyboardWillHideNotification, object: nil)


    func keyBoardWillShow(notification: NSNotification) {
        var info:NSDictionary = notification.userInfo!
        var keyboardSize = (info[UIKeyboardFrameBeginUserInfoKey] as NSValue).CGRectValue()

        var keyboardHeight:CGFloat =  keyboardSize.height - 40

        var animationDuration:CGFloat = info[UIKeyboardAnimationDurationUserInfoKey] as CGFloat

        var contentInsets: UIEdgeInsets = UIEdgeInsetsMake(0.0, 0.0, keyboardHeight, 0.0);
        self.tableView.contentInset = contentInsets
        self.tableView.scrollIndicatorInsets = contentInsets

    }



    func keyBoardWillHide(notification: NSNotification) {

        self.tableView.contentInset = UIEdgeInsetsZero
        self.tableView.scrollIndicatorInsets = UIEdgeInsetsZero
    }

Answer 1

更改前两行：

NSNotificationCenter.defaultCenter().addObserver(self, selector: "keyBoardWillShow:", name: UIKeyboardWillShowNotification, object: nil)
NSNotificationCenter.defaultCenter().addObserver(self, selector: "keyBoardWillHide:", name: UIKeyboardWillHideNotification, object: nil)

到：

NSNotificationCenter.defaultCenter().addObserver(self, selector: Selector("keyboardWillShow:"), name:UIKeyboardWillShowNotification, object: nil);
NSNotificationCenter.defaultCenter().addObserver(self, selector: Selector("keyboardWillHide:"), name:UIKeyboardWillHideNotification, object: nil);

注意swift中的选择器（＆＃34; nameofheFunction：＆＃34;）语法

Answer 2

导入UIKit

导入CoreData

类ViewController：UIViewController {

override func viewDidLoad() {
    super.viewDidLoad()
   NSNotificationCenter.defaultCenter().removeObserver(self, name: UIKeyboardWillShowNotification, object: nil)
    NSNotificationCenter.defaultCenter().removeObserver(self, name: UIKeyboardWillHideNotification, object: nil)

    NSNotificationCenter.defaultCenter().addObserver(self, selector: "keyBoardWillShow:", name: UIKeyboardWillShowNotification, object: nil)
    NSNotificationCenter.defaultCenter().addObserver(self, selector: "keyBoardWillHide:", name: UIKeyboardWillHideNotification, object: nil)
    // Do any additional setup after loading the view, typically from a nib.
}

override func didReceiveMemoryWarning() {
    super.didReceiveMemoryWarning()
    // Dispose of any resources that can be recreated.
}



func keyBoardWillShow(notification: NSNotification) {
   var info:NSDictionary = notification.userInfo!
    var keyboardSize = (info[UIKeyboardFrameBeginUserInfoKey] as NSValue).CGRectValue()

    var keyboardHeight:CGFloat =  keyboardSize.height - 40

    var animationDuration:CGFloat = info[UIKeyboardAnimationDurationUserInfoKey] as CGFloat

    var contentInsets: UIEdgeInsets = UIEdgeInsetsMake(0.0, 0.0, keyboardHeight, 0.0);
    self.tableView.contentInset = contentInsets
    self.tableView.scrollIndicatorInsets = contentInsets
}



func keyBoardWillHide(notification: NSNotification) {
     self.tableView.contentInset = UIEdgeInsetsZero
    self.tableView.scrollIndicatorInsets = UIEdgeInsetsZero
}

}

NSNotificationCenter＆＃34;糟糕的指令＆＃34; xcode6

2 个答案: