如何在UILongPressGestureRecognizer上更改圖像？

Question

我正在為Iphone開發SMS應用程序。.現在，我想在longpress上更改聊天氣泡的圖像（就像我復制contant一樣）。

我有這個代碼..

if (longPressRecognizer.state == UIGestureRecognizerStateBegan) 
    {


        [self becomeFirstResponder];

        //NSIndexPath *pressedIndexPath = [tblOutgoingMessagesRecords indexPathForRowAtPoint:[longPressRecognizer locationInView:tblOutgoingMessagesRecords]];

        NSIndexPath *pressedIndexPath = [tblOutgoingMessagesRecords indexPathForCell:(UITableViewCell *)longPressRecognizer.view];
        if (pressedIndexPath && (pressedIndexPath.row != NSNotFound) && (pressedIndexPath.section != NSNotFound)) 
        {
            [self becomeFirstResponder];
            NSLog(@" Presssed on Copy ");

我只想將聊天氣泡顏色更改為藍色，而我按住loncopy以進行復制..就像在iPhone中默認操作一樣，我也想做同樣的事情...有人可以幫我嗎...

Answer 1

似乎您必須檢查狀態是否為UIGestureRecognizerStateRecognized才能更改聊天氣泡的顏色，

if (longPressRecognizer.state == UIGestureRecognizerStateRecognized) {

    // Change Chat bubble's color to blue
}

Answer 2

長按手勢開始時將顏色檢查為紅色

if (longPressRecognizer.state == UIGestureRecognizerStateBegan) 
{


    [self becomeFirstResponder];
   // change image from  here
    //NSIndexPath *pressedIndexPath = [tblOutgoingMessagesRecords indexPathForRowAtPoint:[longPressRecognizer locationInView:tblOutgoingMessagesRecords]];

    NSIndexPath *pressedIndexPath = [tblOutgoingMessagesRecords indexPathForCell:(UITableViewCell *)longPressRecognizer.view];
    if (pressedIndexPath && (pressedIndexPath.row != NSNotFound) && (pressedIndexPath.section != NSNotFound)) 
    {
        [self becomeFirstResponder];
        NSLog(@" Presssed on Copy ");
  }
}
else  if (longPressRecognizer.state == UIGestureRecognizerStateChanged)
 {

    //load original  image here...

   }