这里的APP缓存是指Cache文件夹里的内容，iOS系统从iOS 10开始就支持系统自动清理功能了。
建议重要的内容不要放到 Cache文件夹中。
一、获取缓存
/// 获取缓存大小
public static func getCacheSize() -> String {
let folderPath = NSSearchPathForDirectoriesInDomains(.cachesDirectory, .userDomainMask, true).first ?? ""
let manager = FileManager.default
guard let files = manager.subpaths(atPath: folderPath)
else {
return "0.0B"
}
var folderSize = 0.0
for path in files {
let temPath: String = folderPath + "/" + path
let folder = try? manager.attributesOfItem(atPath: temPath) as NSDictionary
if let c = folder?.fileSize() {
folderSize += Double(Float(c))
}
}
// 保留2位小数
if folderSize > 1024 * 1024 {
return String(format: "%.2f", Double(folderSize)/1024.0/1024.0) + "MB"
} else if folderSize > 1024 {
return String(format: "%.2f", Double(folderSize)/1024.0) + "KB"
} else {
return String(folderSize) + "B"
}
}二、清除缓存
/// 清理缓存
public static func cleanCache(_ block: (() -> Void)?) {
DispatchQueue.global().async {
// 文件路径
let folderPath = NSSearchPathForDirectoriesInDomains(.cachesDirectory, .userDomainMask, true).first ?? ""
if let files = FileManager.default.subpaths(atPath: folderPath) {
for path in files {
let temPath: String = folderPath + "/" + path
if FileManager.default.fileExists(atPath: temPath) == true {
try? FileManager.default.removeItem(atPath: temPath)
}
}
}
// 返回主线程
DispatchQueue.main.async {
if let block = block {
block()
}
}
}
}三、清除网页缓存
/// 清除网页缓存
public static func cleanWebCache() {
let types = [WKWebsiteDataTypeMemoryCache, WKWebsiteDataTypeDiskCache]
let websiteDataTypes = Set(types)
let dateFrom = Date(timeIntervalSince1970: 0)
WKWebsiteDataStore.default().removeData(ofTypes: websiteDataTypes, modifiedSince: dateFrom) {
}
}