检测开始和停止编辑UITextView [英] Detect Start and Stop Editing UITextView

问题描述

如何在输入UITextView（用户点按以编辑它）并离开视图（用户点击以离开它）时调用某些代码？

How can I call some code upon entering a UITextView (user taps to edit it) and leaving the view (user taps to leave it)?

感谢任何帮助。

推荐答案

http://developer.apple.com/library/ios/#documentation/uikit/reference/UITextViewDelegate_Protocol/参考/ UITextViewDelegate.html＃// apple_ref / occ / intf / UITextViewDelegate

在这里你可以找到几个有用的方法来研究：

Here you can find several useful methods to investigate:

• textViewDidBeginEditing：


• textViewDidEndEditing：

• textViewDidBeginEditing:
• textViewDidEndEditing:

此外要住 UITextView 你经常应该这样做实现调用 [yourTextView resignFirstResponder]的行动;

Moreover to live UITextView you often should implement action that calls [yourTextView resignFirstResponder];

Objective-C示例le

//you may specify UITextViewDelegate protocol in .h file interface, but it's better not to expose it if not necessary
@interface ExampleViewController()<UITextViewDelegate> 

@end

@implementation ExampleViewController

- (void)viewDidLoad {
    [super viewDidLoad];

    //assuming _textView is already instantiated and added to its superview
    _textView.delegate = self;
}


//it's nice to separate delegate methods with pragmas but it's up to your local code style policy
#pragma mark UITextViewDelegate

- (void)textViewDidBeginEditing:(UITextView *)textView {
    //handle user taps text view to type text
}

- (void)textViewDidEndEditing:(UITextView *)textView {
    //handle text editing finished    
}

@end

Swift示例

class TextViewEventsViewController: UIViewController, UITextViewDelegate {

    @IBOutlet weak var exampleTextView: UITextView!

    override func viewDidLoad() {
        super.viewDidLoad()

        self.exampleTextView.delegate = self
    }

    func textViewDidBeginEditing(_ textView: UITextView) {
        print("exampleTextView: BEGIN EDIT")
    }

    func textViewDidEndEditing(_ textView: UITextView) {
        print("exampleTextView: END EDIT")
    }
}

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