Question

我想知道当我们长按UITextfield或UITextview来移动光标时会触发哪个委托方法？请帮帮我。

Answer 1

没有合适的UITextField委托来检测光标移动。

使用UITextView时，您可以使用textViewDidChangeSelection:，请参阅here。

Answer 2

您应该为此目的使用手势识别器

1）首先将识别器添加到TextFiled

**-(void)viewDidLoad{**

    UILongPressGestureRecognizer *recognizerTextFiled = [[UILongPressGestureRecognizer alloc] initWithTarget:self action:@selector(longPressHandlerGurmukhiFirstSearch:)];

    recognizerTextFiled.minimumPressDuration = 0.5;

    //after this time Recognizer will invoke   

    // here i have added the Recognizer to that textField

    // myTextFiled is a textField at which we want to detect the cursor movement

     [myTextFiled addGestureRecognizer:recognizerTextFiled];

     [recognizerTextFiled release];      
    }

2）您可以在检测到光标移动如下

后编写逻辑

**-(void)longPressHandlerGurmukhiFirstSearch:(UILongPressGestureRecognizer *)gestureRecognizer**
 {           
       if(UIGestureRecognizerStateBegan ==gestureRecognizer.state)
         {
  // you can write the code here as you want for moving the Cursor
        }

if(UIGestureRecognizerStateChanged == gestureRecognizer.state) {
            // Do repeated work here (repeats continuously) while finger is down
      }

  if(UIGestureRecognizerStateEnded == gestureRecognizer.state) {
            // Do end work here when finger is lifted
        }
    }
}

我希望这可以帮助您检测 UITextField

上的光标移动

在UITextfield或UITextview中会触发哪种委托方法？

2 个答案: