围绕UILabel的每个字边界

Question

有没有办法可以围绕每个单词绘制边框UILabel.假设UILabel包含字符串"This is the Line 1".

我想要5个不同的边框,大约5个字

1. 这个
2. 是
3. 该
4. 线
5. 1

Answer 1

我不知道UILabel的易用代码,但对于UITextView:

斯威夫特操场

建立:

import UIKit

let string = "Lorem ipsum dolor sit amet"

let textView = UITextView(frame: CGRect(x: 0, y: 0, width: 100, height: 100))
textView.text = string

使用正则表达式获得每个单词的匹配:

let pattern = "[a-zA-Z0-9]+"
let regex = try! NSRegularExpression(pattern: pattern, options: [])
let matches = regex.matchesInString(string, options: [], range: NSMakeRange(0, string.characters.count))

函数获取每个匹配的矩形(从此答案移植):

func frameOfTextInRange(range:NSRange, inTextView textView:UITextView) -> CGRect {
    let beginning = textView.beginningOfDocument
    let start = textView.positionFromPosition(beginning, offset: range.location)!
    let end = textView.positionFromPosition(start, offset: range.length)!
    let textRange = textView.textRangeFromPosition(start, toPosition: end)!
    let rect = textView.firstRectForRange(textRange)
    return textView.convertRect(rect, fromView: textView)
}

迭代每个匹配,获取其框架,使用它来创建背景视图,将其添加到文本视图:

for m in matches {
    let range = m.range
    let frame = frameOfTextInRange(range, inTextView: textView)
    let v = UIView(frame: frame)
    v.layer.borderWidth = 1
    v.layer.borderColor = UIColor.blueColor().CGColor
    textView.addSubview(v)

}

但这可能不会给你期待的结果.要获得更好的控件,可以使用属性字符串.

这里使用属性字符串的相同代码

import UIKit

let string = "Lorem ipsum dolor sit amet"

let textView = UITextView(frame: CGRect(x: 0, y: 0, width: 100, height: 100))

let attributedString = NSMutableAttributedString(string: string)
let paragraphStyle = NSMutableParagraphStyle()
paragraphStyle.lineHeightMultiple = 1.25
attributedString.addAttribute(NSParagraphStyleAttributeName, value: paragraphStyle, range: NSMakeRange(0, string.characters.count))

textView.attributedText = attributedString

let pattern = "[a-zA-Z0-9]+"
let regex = try! NSRegularExpression(pattern: pattern, options: [])
let matches = regex.matchesInString(string, options: [], range: NSMakeRange(0, string.characters.count))

func frameOfTextInRange(range:NSRange, inTextView textView:UITextView) -> CGRect {
    let beginning = textView.beginningOfDocument
    let start = textView.positionFromPosition(beginning, offset: range.location)!
    let end = textView.positionFromPosition(start, offset: range.length)!
    let textRange = textView.textRangeFromPosition(start, toPosition: end)!
    let rect = textView.firstRectForRange(textRange)
    return textView.convertRect(rect, fromView: textView)
}

for m in matches {
    let range = m.range
    var frame = frameOfTextInRange(range, inTextView: textView)
    frame = CGRectInset(frame, CGFloat(-1.2), CGFloat(2))
    frame = CGRectOffset(frame, CGFloat(0), CGFloat(2))
    let v = UIView(frame: frame)
    v.layer.borderWidth = 1
    v.layer.borderColor = UIColor.blueColor().CGColor
    textView.addSubview(v)

}

创建漂亮样式也很有帮助,可以将视图添加到背景视图中,并将该textview添加到顶部

import UIKit

let string = "Lorem ipsum dolor sit amet"

let textView = UITextView(frame: CGRect(x: 0, y: 0, width: 100, height: 100))
let textViewBG = UIView(frame: textView.bounds)
textViewBG.backgroundColor = UIColor.whiteColor()
let attributedString = NSMutableAttributedString(string: string)
let paragraphStyle = NSMutableParagraphStyle()
paragraphStyle.lineHeightMultiple = 1.25
attributedString.addAttribute(NSParagraphStyleAttributeName, value: paragraphStyle, range: NSMakeRange(0, string.characters.count))
attributedString.addAttribute(NSForegroundColorAttributeName, value: UIColor.whiteColor(), range: NSMakeRange(0, string.characters.count))
textView.attributedText = attributedString
textView.backgroundColor = UIColor.clearColor()

let pattern = "[a-zA-Z0-9]+"
let regex = try! NSRegularExpression(pattern: pattern, options: [])
let matches = regex.matchesInString(string, options: [], range: NSMakeRange(0, string.characters.count))

func frameOfTextInRange(range:NSRange, inTextView textView:UITextView) -> CGRect {
    let beginning = textView.beginningOfDocument
    let start = textView.positionFromPosition(beginning, offset: range.location)!
    let end = textView.positionFromPosition(start, offset: range.length)!
    let textRange = textView.textRangeFromPosition(start, toPosition: end)!
    let rect = textView.firstRectForRange(textRange)
    return textView.convertRect(rect, fromView: textView)
}

for m in matches {
    let range = m.range
    var frame = frameOfTextInRange(range, inTextView: textView)
    frame = CGRectInset(frame, CGFloat(-1.2), CGFloat(2))
    frame = CGRectOffset(frame, CGFloat(0), CGFloat(2))
    let v = UIView(frame: frame)
    v.layer.cornerRadius = 2
    v.backgroundColor = UIColor(hue: 0.66, saturation: 0.6, brightness: 1, alpha: 1)
    textViewBG.addSubview(v)

}
textViewBG.addSubview(textView)

为了增加单词之间的空间,我们可以改变空格的字距

import UIKit

func frameOfTextInRange(range:NSRange, inTextView textView:UITextView) -> CGRect {
    let beginning = textView.beginningOfDocument
    let start = textView.positionFromPosition(beginning, offset: range.location)!
    let end = textView.positionFromPosition(start, offset: range.length)!
    let textRange = textView.textRangeFromPosition(start, toPosition: end)!
    let rect = textView.firstRectForRange(textRange)
    return textView.convertRect(rect, fromView: textView)
}

let string = "Lorem ipsum dolor sit amet"

let textView = UITextView(frame: CGRect(x: 0, y: 0, width: 100, height: 100))
textView.backgroundColor = UIColor.clearColor()

textView.attributedText = {
    let attributedString = NSMutableAttributedString(string: string)
    let paragraphStyle = NSMutableParagraphStyle()
    paragraphStyle.lineHeightMultiple = 1.25
    attributedString.addAttribute(NSParagraphStyleAttributeName, value: paragraphStyle, range: NSMakeRange(0, string.characters.count))
    attributedString.addAttribute(NSForegroundColorAttributeName, value: UIColor.whiteColor(), range: NSMakeRange(0, string.characters.count))

    let regex = try! NSRegularExpression(pattern: "\\s", options: [])
    let matches = regex.matchesInString(string, options: [], range: NSMakeRange(0, string.characters.count))
    for m in matches {
        attributedString.addAttribute(NSKernAttributeName, value: 6, range: m.range)
    }
    return NSAttributedString(attributedString: attributedString)
}()

let textViewBG = UIView(frame: textView.bounds)
textViewBG.backgroundColor = UIColor.whiteColor()


let pattern = "[^ ]+"
let regex = try! NSRegularExpression(pattern: pattern, options: [])
let matches = regex.matchesInString(string, options: [], range: NSMakeRange(0, string.characters.count))

for m in matches {
    textViewBG.addSubview({
        let range = m.range
        var frame = frameOfTextInRange(range, inTextView: textView)
        frame = CGRectInset(frame, CGFloat(-3), CGFloat(2))
        frame = CGRectOffset(frame, CGFloat(0), CGFloat(3))
        let v = UIView(frame: frame)
        v.layer.cornerRadius = 2
        v.backgroundColor = UIColor(hue: 211.0/360.0, saturation: 0.35, brightness: 0.78    , alpha: 1)
        return v
    }())
}

textViewBG.addSubview(textView)