TouchesMoved 只获取一次标签文本答案

【问题标题】：TouchesMoved get label text only onceTouchesMoved 只获取一次标签文本
【发布时间】：2013-11-03 11:33:20
【问题描述】：

我正在开发一款经典游戏“找词” 像这个寻找“狮子”的例子

G H K J L D F G F Y E

J L M N L I O N A D T

G F O I A F E A D G H ...

我有这个代码来获取所有的字母值

- (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event{

[self touchesBegan:touches withEvent:event];
UITouch *touch = [[event allTouches] anyObject];

CGPoint touchPoint = [[touches anyObject] locationInView:allLetters];
for (UILabel *letter in self.lettersArray) {


    if (touchPoint.x > letter.frame.origin.x &&
        touchPoint.x < letter.frame.origin.x + letter.frame.size.width &&
        touchPoint.y > letter.frame.origin.y &&
        touchPoint.y < letter.frame.origin.y + letter.frame.size.height )
    {

       [letter setBackgroundColor:[UIColor redColor]];
        NSLog(@"%@",letter.text);



    }


}}

它运行良好，因为当我用手指触摸标签文本时，它会正确获取它们。我的问题是我只需要获得一次价值......

现在它会多次获取该值，直到您传递给另一个字母

你有什么建议吗？

非常感谢！！

【问题讨论】：

标签： ios uilabel touch-event

【解决方案1】：

为此，您必须保存最后一个字母边界，并检查您是否在同一个矩形中或已移开。

首先，声明一个矩形来存储当前字母。

CGRect lastLetter;

然后按照以下方式修改您的方法：

- (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event{

[self touchesBegan:touches withEvent:event];
UITouch *touch = [[event allTouches] anyObject];

CGPoint touchPoint = [[touches anyObject] locationInView:allLetters];
for (UILabel *letter in self.lettersArray) {


    if (touchPoint.x > letter.frame.origin.x &&
        touchPoint.x < letter.frame.origin.x + letter.frame.size.width &&
        touchPoint.y > letter.frame.origin.y &&
        touchPoint.y < letter.frame.origin.y + letter.frame.size.height )
    {

       [letter setBackgroundColor:[UIColor redColor]];
        if(letter.frame.origin.x != lastLetter.origin.x)
        {
             lastLetter = letter.frame;
             NSLog(@"%@",letter.text);
        }



    }


}}

【讨论】：

哇！谢谢老兄！太完美了……我也为 Y 添加了 if 语句

【解决方案2】：

您可以创建一个数组来存储所有触摸的标签，如下所示：

- (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event{

   if(!_touchedLetters) // create the array if it doesn't exists
      _touchedLetters = [[NSMutableArray alloc] init];

   [self touchesBegan:touches withEvent:event];
   UITouch *touch = [[event allTouches] anyObject];

   CGPoint touchPoint = [[touches anyObject] locationInView:allLetters];
   for (UILabel *letter in self.lettersArray) {

    if([_touchedLetters containsObject:letter]) //continue if it already been added
        continue;

    if (touchPoint.x > letter.frame.origin.x &&
        touchPoint.x < letter.frame.origin.x + letter.frame.size.width &&
        touchPoint.y > letter.frame.origin.y &&
        touchPoint.y < letter.frame.origin.y + letter.frame.size.height )
    {

       [letter setBackgroundColor:[UIColor redColor]];
        NSLog(@"%@",letter.text);

       [_touchedLetters addObject:letter]
    }
}}

然后你可以清空数组 - (void)touchesEnded:withEvent:

【讨论】：