我正在将代码从以前版本的 Swift 更改为 Swift5。并且有一条警告信息表明此代码不可用。我想更改此代码，但我不知道如何更改。
警告代码
func pbkdf2(hash: CCPBKDFAlgorithm, password: String, salt: Data, keyByteCount: Int, round: Int) -> Data? {
let passwordData = password.data(using: .utf8)!
let derivedKeyData = Data(count: keyByteCount)
var localVariables = derivedKeyData
let derivationStatus = localVariables.withUnsafeMutableBytes { derivedKeyBytes in
salt.withUnsafeBytes { saltBytes in
CCKeyDerivationPBKDF(CCPBKDFAlgorithm(kCCPBKDF2),
password, passwordData.count, saltBytes, salt.count,
hash, UInt32(round),
derivedKeyBytes, derivedKeyData.count)
}
}
if (derivationStatus != 0) {
Log.Error("\(derivationStatus)")
return nil;
}
return localVariables
}
警告信息：
不推荐使用“withUnsafeMutableBytes”：
withUnsafeMutableBytes<R>(_: (UnsafeMutableRawBufferPointer) throws -> R) rethrows -> R改用不推荐使用“withUnsafeBytes”：
withUnsafeBytes<R>(_: (UnsafeRawBufferPointer) throws -> R) rethrows -> R改用
如何更改此代码以删除警告消息？
func pbkdf2(hash: CCPBKDFAlgorithm, password: String, salt: Data, keyByteCount: Int, round: Int) -> Data? {
let passwordData = password.data(using: .utf8)!
let derivedKeyData = Data(count: keyByteCount)
var localVariables = derivedKeyData
let derivationStatus = localVariables.withUnsafeMutableBytes { derivedKeyBytes in
let Mutable: UnsafeMutableRawPointer? = derivedKeyBytes.baseAddress
salt.withUnsafeBytes { saltBytes in
let raw: UnsafeRawPointer? = saltBytes.baseAddress
CCKeyDerivationPBKDF(CCPBKDFAlgorithm(kCCPBKDF2),
password, passwordData.count, raw?.assumingMemoryBound(to: UInt8.self), salt.count,
hash, UInt32(round),
Mutable?.assumingMemoryBound(to: UInt8.self) , derivedKeyData.count)
}
}
if (derivationStatus != 0) {
Log.Error("\(derivationStatus)")
return nil;
}
return localVariables
}
错误信息：
二元运算符 '!=' 不能应用于类型为 '()' 和 'Int' 的操作数
警告信息：
推断常量 'derivationStatus' 具有类型 '()'，这可能出乎意料
我改变它是否正确？我想我需要纠正比较，我应该如何纠正它？
我在@MartinR的帮助下解决了这个问题。这是链接是@MartinR建议作为一个答案。
替换saltBytes为saltBytes.bindMemory(to: UInt8.self).baseAddress，类似地替换为derivedKeyBytes。
缺少所有警告的成功代码
func pbkdf2(hash: CCPBKDFAlgorithm, password: String, salt: Data, keyByteCount: Int, round: Int) -> Data? {
let passwordData = password.data(using: .utf8)!
let derivedKeyData = Data(count: keyByteCount)
var localVariables = derivedKeyData
let derivationStatus = localVariables.withUnsafeMutableBytes { derivedKeyBytes in
salt.withUnsafeBytes { saltBytes in
CCKeyDerivationPBKDF(CCPBKDFAlgorithm(kCCPBKDF2),
password, passwordData.count, saltBytes.bindMemory(to: UInt8.self).baseAddress, salt.count,
hash, UInt32(round),
derivedKeyBytes.bindMemory(to: UInt8.self).baseAddress , derivedKeyData.count)
}
}
if (derivationStatus != 0) {
Log.Error("\(derivationStatus)")
return nil;
}
return localVariables
}
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我来说两句