iphone - 检测开始和停止编辑UITextView

进入UITextView(用户点击以对其进行编辑)并离开 View (用户点击以使其离开)时，如何调用某些代码？

感谢任何帮助。

最佳答案

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

在这里您可以找到几种有用的调查方法:

textViewDidBeginEditing:

textViewDidEndEditing:

此外，要直播UITextView，您通常应该执行调用[yourTextView resignFirstResponder];的操作

Objective-C示例

//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")
    }
}