xcode6 swift NSObject AnyObject错误

发布时间：2020-12-14 17:32:41 所属栏目：百科来源：网络整理

导读：我已经使用了 How to move content of UIViewController upwards as Keypad appears using Swift中的代码来阻止键盘覆盖我的视图. 不知怎的,我无法让它工作(主要是因为我的n00b编程“技能”) 这是我得到的错误：[NSObject：AnyObject]在这行代码中没有名为’

我已经使用了 How to move content of UIViewController upwards as Keypad appears using Swift中的代码来阻止键盘覆盖我的视图.

不知怎的,我无法让它工作(主要是因为我的n00b编程“技能”)
这是我得到的错误：[NSObject：AnyObject]在这行代码中没有名为’valueForKey’的成员：let s：NSValue = sender.userInfo.valueForKey(UIKeyboardFrameBeginUserInfoKey)as NSValue;

我想我必须创建某种类型的IBAction,但我尝试的任何工作都没有.我需要做些什么来使代码工作？为什么我必须这样做？ NSObject做什么？

这是代码：

override func viewDidLoad() {
    super.viewDidLoad()
    NSNotificationCenter.defaultCenter().addObserver(self,selector: Selector("keyboardWillShow:"),name:UIKeyboardWillShowNotification,object: nil);
    NSNotificationCenter.defaultCenter().addObserver(self,selector: Selector("keyboardWillHide:"),name:UIKeyboardWillHideNotification,object: nil);
}

deinit {
    NSNotificationCenter.defaultCenter().removeObserver(self);
}

func keyboardWillShow(sender: NSNotification) {
    let s:NSValue = sender.userInfo.valueForKey(UIKeyboardFrameEndUserInfoKey) as NSValue;
    let rect :CGRect = s.CGRectValue();
    var frame = self.textField.frame;
    frame.origin.y = frame.origin.y - rect.height;
    self.textField.frame = frame;
}

func keyboardWillHide(sender: NSNotification) {
    let s:NSValue = sender.userInfo.valueForKey(UIKeyboardFrameBeginUserInfoKey) as NSValue;
    let rect :CGRect = s.CGRectValue();
    var frame = self.textField.frame;
    frame.origin.y = frame.origin.y + rect.height;
    self.textField.frame = frame;
}

解决方法

您必须将userInfo强制转换为NSDictionary
将以上功能替换为以下功能

func keyboardWillShow(sender: NSNotification) {
    let dict:NSDictionary = sender.userInfo as NSDictionary
    let s:NSValue = dict.valueForKey(UIKeyboardFrameEndUserInfoKey) as NSValue;
    let rect :CGRect = s.CGRectValue();
    var frame = self.textField.frame;
    frame.origin.y = frame.origin.y - rect.height;
    self.textField.frame = frame;
}

func keyboardWillHide(sender: NSNotification) {
    let dict:NSDictionary = sender.userInfo as NSDictionary
    let s:NSValue = dict.valueForKey(UIKeyboardFrameBeginUserInfoKey) as NSValue;
    let rect :CGRect = s.CGRectValue();
    var frame = self.textField.frame;
    frame.origin.y = frame.origin.y + rect.height;
    self.textField.frame = frame;
}

编辑

//Add this above viewDidLoad
    var selecteTextFieldOriginalY:CGFloat = 0.0;

//write in viewDidLoad
    override func viewDidLoad() {
        super.viewDidLoad()
        NSNotificationCenter.defaultCenter().addObserver(self,name:UIKeyboardDidShowNotification,object: nil);
        NSNotificationCenter.defaultCenter().addObserver(self,name:UIKeyboardDidHideNotification,object: nil);
    }

//Replace these functions
    func keyboardWillShow(sender: NSNotification) {
        let dict:NSDictionary = sender.userInfo as NSDictionary
        let s:NSValue = dict.valueForKey(UIKeyboardFrameEndUserInfoKey) as NSValue;
        let rect :CGRect = s.CGRectValue();

        var frame = self.textField.frame;
        selecteTextFieldOriginalY = frame.origin.y;

//Adjust 80 according to your need actually if is for padding and quickTypeView
        var offset = (rect.height - ((self.view.frame.height - self.textField.frame.origin.y)+self.textField.frame.size.height))+80;
        print(offset)
        frame.origin.y = offset>0 ? frame.origin.y - offset : frame.origin.y ;
        UIView.animateWithDuration(0.3,animations:{
            self.textField.frame = frame;

            }
        )
    }

    func keyboardWillHide(sender: NSNotification) {
        let dict:NSDictionary = sender.userInfo as NSDictionary
        let s:NSValue = dict.valueForKey(UIKeyboardFrameBeginUserInfoKey) as NSValue;
        let rect :CGRect = s.CGRectValue();
        var frame = self.textField.frame;
        frame.origin.y = selecteTextFieldOriginalY ;

        UIView.animateWithDuration(0.3,animations:{
            self.textField.frame = frame;

            })
    }

（编辑：李大同）

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