将 UIGestureRecognizer 添加到 UILabel 的单个字母 [英] Add UIGestureRecognizer to individual letters of UILabel

问题描述

现在我正在制作一个 iOS 应用程序，我想通过简单地删除字母"来实现删除 UILabel 中字母的功能.我遇到问题的部分是向 UILabel 的单个字母添加手势识别器.我已经在网上搜索过这个，一无所获.澄清一下，我不是在整个标签中添加手势识别器，我只想将其添加到单个字母中.非常感谢任何帮助.

Right Now I am making an iOS app and I would like to implement the ability to remove letters in a UILabel by simply "Dropping the letter". The part That I am having an issue with is adding a gesture recognizer to individual letters of a UILabel. I have already searched the web for this and have nothing.Just to be clear, I am NOT adding a gesture recognizer to the whole label, I am only wanting to add it to individual letters. Any help is greatly appreciated.

谢谢

推荐答案

似乎最简单的方法是动态计算字母的位置.使用这个:

It seems that the easiest way to do it is by dynamically calculating the position of a letter. Use this:

CGSize textSize = [text sizeWithFont:[UIFont boldSystemFontOfSize:size]
                   constrainedToSize:constrainedSize
                       lineBreakMode:NSLineBreakByWordWrapping];

因此您可以获取每个标签使用的字体和大小中的字母大小，并使用 [stringInstance length] 属性和 [UILabel numberOfLines] 属性来获取标签中每个字母的近似中心，然后对每个标签使用一个简单的 tapGestureRecognizer 并在那里调用您的方法

so you can get the the size for a letter in the font and size you are using for each label and using the [stringInstance length] property and the [UILabel numberOfLines] property to get the approximate center for each letter in a label, then use a simple tapGestureRecognizer for each label and in there calling your method for

- (NSString*)letterForPoint:(CGPoint)tapCenter inLabel:(UILabel*)label;

在那里你使用一切来计算每个字母的近似中心，并为错误和正确的用户响应添加一个可选范围，如 x +- 20 像素和 y +- 20 像素.

there you use everything to calculate the approximate center for each letter and adding a selectableRange for error and correct user responding as x +- 20 pixels and y +- 20 pixels.

Apple 表示，对于 40 像素的可选边界小于 40 像素的任何内容都会让用户感到厌烦，因此对于用户交互而言，您的字体大小实际上应该相当大.

Apple says that anything with a selectable bound lesser than 40 pixels for 40 pixels will be completely annoying for the user, so your font size should actually be quite big for user interaction.

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