在Swift iOS中更改HTML文本中图像的宽度和高度,可以通过以下步骤实现:
NSAttributedString
类来处理富文本。URLSession
)下载图像数据。UIImage
对象。以下是一个示例代码,演示如何在Swift iOS中更改HTML文本中图像的宽度和高度:
import UIKit
func resizeImagesInHTML(html: String, newWidth: Int, newHeight: Int) -> String {
var modifiedHTML = html
// 步骤 2:提取图像标签
let imageRegex = try! NSRegularExpression(pattern: "<img[^>]+src\\s*=\\s*['\"]([^'\"]+)['\"][^>]*>", options: .caseInsensitive)
let matches = imageRegex.matches(in: html, options: [], range: NSRange(location: 0, length: html.utf16.count))
// 步骤 3-8:遍历图像标签,修改图像的宽度和高度
for match in matches {
let imageTag = (html as NSString).substring(with: match.range)
// 提取图像的URL和宽度、高度属性
let urlRegex = try! NSRegularExpression(pattern: "src\\s*=\\s*['\"]([^'\"]+)['\"]", options: .caseInsensitive)
let urlMatch = urlRegex.firstMatch(in: imageTag, options: [], range: NSRange(location: 0, length: imageTag.utf16.count))
let imageUrl = (imageTag as NSString).substring(with: urlMatch!.range(at: 1))
let widthRegex = try! NSRegularExpression(pattern: "width\\s*=\\s*['\"]([^'\"]+)['\"]", options: .caseInsensitive)
let widthMatch = widthRegex.firstMatch(in: imageTag, options: [], range: NSRange(location: 0, length: imageTag.utf16.count))
let width = (imageTag as NSString).substring(with: widthMatch!.range(at: 1))
let heightRegex = try! NSRegularExpression(pattern: "height\\s*=\\s*['\"]([^'\"]+)['\"]", options: .caseInsensitive)
let heightMatch = heightRegex.firstMatch(in: imageTag, options: [], range: NSRange(location: 0, length: imageTag.utf16.count))
let height = (imageTag as NSString).substring(with: heightMatch!.range(at: 1))
// 下载图像数据
if let imageUrl = URL(string: imageUrl), let imageData = try? Data(contentsOf: imageUrl) {
if let image = UIImage(data: imageData) {
// 修改图像的宽度和高度
let resizedImage = resizeImage(image: image, newWidth: newWidth, newHeight: newHeight)
// 将修改后的图像数据转换为Base64编码的字符串
let base64Image = resizedImage.jpegData(compressionQuality: 1)?.base64EncodedString() ?? ""
// 替换原始HTML文本中的图像标签
modifiedHTML = modifiedHTML.replacingOccurrences(of: imageTag, with: "<img src=\"data:image/jpeg;base64,\(base64Image)\" width=\"\(newWidth)\" height=\"\(newHeight)\">")
}
}
}
return modifiedHTML
}
func resizeImage(image: UIImage, newWidth: Int, newHeight: Int) -> UIImage {
let size = CGSize(width: newWidth, height: newHeight)
UIGraphicsBeginImageContext(size)
image.draw(in: CGRect(origin: .zero, size: size))
let resizedImage = UIGraphicsGetImageFromCurrentImageContext()
UIGraphicsEndImageContext()
return resizedImage ?? image
}
// 示例用法
let html = "<html><body><img src=\"https://example.com/image.jpg\" width=\"100\" height=\"100\"></body></html>"
let modifiedHTML = resizeImagesInHTML(html: html, newWidth: 200, newHeight: 200)
print(modifiedHTML)
这段代码将会遍历HTML文本中的图像标签,下载图像数据并修改宽度和高度,然后将修改后的图像标签替换原始HTML文本中的图像标签。你可以根据需要自定义图像的新宽度和高度。请注意,这只是一个示例,实际应用中可能需要添加错误处理和优化。
领取专属 10元无门槛券
手把手带您无忧上云