UITextView数据变化迅速 [英] UITextView data change swift

问题描述

如何使用 Swift 检测 UITextView 中的数据更改？以下代码不会进行任何检测。

How can you detect a change of data in a UITextView with Swift? The following code does not do any detection.

我声明 UITextView ：

@IBOutlet weak var bodyText: UITextView!

optional func textViewDidChange(_ textView: UITextView!) {
    println(bodyText.text)
}

谢谢
Scott

Thanks Scott

推荐答案

你需要设置UITextView < a href =https://developer.apple.com/library/ios/documentation/UIKit/Reference/UITextViewDelegate_Protocol/Reference/UITextViewDelegate.html#//apple_ref/occ/intf/UITextViewDelegate>委托并实施 textViewDidChange：方法。不幸的是，我不知道是否可以在线获得快速文档。所有链接都转到objective-c文档。

You need to set UITextView delegate and implement textViewDidChange: method in it. Unfortunately, I do not know if swift documentation is available online. All the links go to the objective-c documentation.

代码看起来像这样

class ViewController: UIViewController, UITextViewDelegate { //If your class is not conforms to the UITextViewDelegate protocol you will not be able to set it as delegate to UITextView

    @IBOutlet weak var bodyText: UITextView!

    override func viewDidLoad() {
        super.viewDidLoad()
        bodyText.delegate = self //Without setting the delegate you won't be able to track UITextView events
    }

    func textViewDidChange(textView: UITextView) { //Handle the text changes here
        print(textView.text); //the textView parameter is the textView where text was changed
    }
}

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