最近做视频类App，需要给视频添加字幕，做到同步播放，我这边针对这个需求用swift将SRT解析封装成了一个类库：JKCaptionsHelper，对OC和Swift都支持，注：对OC提供部分支持，但可以满足使用。
下载地址：https://github.com/xindizhiyin2014/JKCaptionsHelper
集成命令：
pod 'JKCaptionsHelper'
源码如下：
//
// JKSRTHelper.swift
// JKCaptionsHelper
//
// Created by JackLee on 2019/4/29.
//
import Foundation
public enum JKSubTitleType {
case oneLanguage // 单语言字幕模式
case twoLanguage // 双语言字幕模式
}
@objcMembers public class JKSRTHelper :NSObject {
private var beginTimes:[Float]? // 字幕开始时间
private var endTimes:[Float]? // 字幕结束时间
private var firstSubTitles:[String]? // 第一语言字幕
private var secondSubTitles:[String]? // 第二语言字幕
private var progressIndex = 0 // 字幕播放进度索引
public class func initWithFilePath(filePath:String!,subTitleType:JKSubTitleType!) -> JKSRTHelper{
let data = NSData.init(contentsOfFile: filePath as String)
return self.initWithData(data: data,subTitleType: subTitleType)
}
public class func initWithString(content:String!,subTitleType:JKSubTitleType!) ->JKSRTHelper{
let data = content.data(using: .utf8, allowLossyConversion: true)
return self.initWithData(data: data as NSData?,subTitleType: subTitleType)
}
public class func initWithData(data:NSData?,subTitleType:JKSubTitleType!) -> JKSRTHelper{
let content = String(data: data! as Data, encoding: .utf8)
let array = content?.components(separatedBy: "\n")
var beginTimes = [Float]()
var endTimes = [Float]()
var firstSubTitles = [String]()
var secondSubTitles:[String]?
var unitLineCount = 4 //单位行数
if subTitleType == .twoLanguage{
unitLineCount = 5
secondSubTitles = [String]()
}
for i in 0 ..< array!.count {
if i%unitLineCount == 0 { //不做处理
}
else if i%unitLineCount == 1 { //时间处理
let timeStr = array![i]
let range:Range = timeStr.range(of: " --> ")!
if range.isEmpty == false {
let beginStr = String(timeStr[..<range.lowerBound])
let endStr = String(timeStr[range.upperBound...])
let arr1 = beginStr.components(separatedBy:":")
let arr2 = arr1[2].components(separatedBy:",")
//将开始时间数组中的时间转换为秒为单位的
let beginHour:Float = Float(arr1[0])! * Float(60) * Float(60)
let beginMinute:Float = Float(arr1[1])! * Float(60)
let beginSecond:Float = Float(arr2[0])! + Float(arr2[1])!/Float(1000)
let beginTime = beginHour + beginMinute + beginSecond
beginTimes.append(beginTime)
let arr3 = endStr.components(separatedBy: ":")
let arr4 = arr3[2].components(separatedBy: ",")
//将结束时间数组中的时间转换为秒为单位的
let endHour:Float = Float(arr3[0])! * Float(60) * Float(60)
let endMinute:Float = Float(arr3[1])! * Float(60)
let endSecond:Float = Float(arr4[0])! + Float(arr4[1])!/Float(1000)
let endTime = endHour + endMinute + endSecond
endTimes.append(endTime)
}
}
else{
if i%unitLineCount == 2 { //第一语言字幕
firstSubTitles.append(array![i])
}
else if i%unitLineCount == 3{ //第二语言字幕
secondSubTitles!.append(array![i])
}
}
}
let srtHelper:JKSRTHelper = JKSRTHelper.init()
srtHelper.beginTimes = beginTimes
srtHelper.endTimes = endTimes
srtHelper.firstSubTitles = firstSubTitles
srtHelper.secondSubTitles = secondSubTitles
return srtHelper
}
public class func initWithArray(array:[NSDictionary]) -> JKSRTHelper{
var beginTimes = [Float]()
var endTimes = [Float]()
var firstSubTitles = [String]()
for dic:NSDictionary in array {
let timeStr:String = dic["duration"] as! String
let lines:String = dic["lines"] as! String
firstSubTitles.append(lines)
let range:Range = timeStr.range(of: " --> ")!
if range.isEmpty == false {
let beginStr = String(timeStr[..<range.lowerBound])
let endStr = String(timeStr[range.upperBound...])
let arr1 = beginStr.components(separatedBy:":")
let arr2 = arr1[2].components(separatedBy:",")
//将开始时间数组中的时间转换为秒为单位的
let beginHour:Float = Float(arr1[0])! * Float(60) * Float(60)
let beginMinute:Float = Float(arr1[1])! * Float(60)
let beginSecond:Float = Float(arr2[0])! + Float(arr2[1])!/Float(1000)
let beginTime = beginHour + beginMinute + beginSecond
beginTimes.append(beginTime)
let arr3 = endStr.components(separatedBy: ":")
let arr4 = arr3[2].components(separatedBy: ",")
//将结束时间数组中的时间转换为秒为单位的
let endHour:Float = Float(arr3[0])! * Float(60) * Float(60)
let endMinute:Float = Float(arr3[1])! * Float(60)
let endSecond:Float = Float(arr4[0])! + Float(arr4[1])!/Float(1000)
let endTime = endHour + endMinute + endSecond
endTimes.append(endTime)
}
}
let srtHelper:JKSRTHelper = JKSRTHelper.init()
srtHelper.beginTimes = beginTimes
srtHelper.endTimes = endTimes
srtHelper.firstSubTitles = firstSubTitles
return srtHelper
}
public func playSRTWithTime(currentTime:CGFloat,content:((_ firstSubTitle:String?,_ secondSubTitle:String?)->Void)!) -> Void {
let time:Float = Float(currentTime)
for i in self.progressIndex ..< self.beginTimes!.count {
let beiginTime = self.beginTimes![i]
let endTime = self.endTimes![i]
if time >= beiginTime && time <= endTime {
if let content = content {
let firstSubTitle = self.firstSubTitles![i]
if self.secondSubTitles != nil {
let secondSubTitle = self.secondSubTitles![i]
content(firstSubTitle,secondSubTitle)
}else{
content(firstSubTitle,nil)
}
}
self.progressIndex = i
break
}
}
}
public func resetProgressIndex() -> Void{
self.progressIndex = 0
}
}
如果有什么bug，或者不够好的，欢迎大家多多指教。
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