[英]How to use UnsafeMutablePointer in Swift 3?
I have the following code written in Swift 2.2: 我在Swift 2.2中编写了以下代码:
let keyData = NSMutableData(length: 64)!
SecRandomCopyBytes(kSecRandomDefault, 64, UnsafeMutablePointer<UInt8>(keyData.mutableBytes))
XCode 8 highlights that second line and claims that XCode 8强调了第二行并声称
Cannot invoke initializer for type 'UnsafeMutablePointer<_>' with an argument list of type '(UnsafeMutableRawPointer)' 无法使用类型为'(UnsafeMutableRawPointer)'的参数列表调用类型'UnsafeMutablePointer <_>'的初始值设定项
While I appreciate XCode telling me this, I don't quite understand how to change the UnsafeMutableRawPointer to be acceptable. 虽然我很欣赏XCode告诉我这一点,但我不太明白如何将UnsafeMutableRawPointer更改为可接受。
Does anyone know how to convert this code into Swift 3? 有谁知道如何将此代码转换为Swift 3?
I recommend you to work with Data
rather than NSData
in Swift 3. 我建议你在Swift 3中使用Data
而不是NSData
。
var keyData = Data(count: 64)
let result = keyData.withUnsafeMutableBytes {mutableBytes in
SecRandomCopyBytes(kSecRandomDefault, keyData.count, mutableBytes)
}
withUnsafeMutableBytes(_:)
is declared as a generic method, so, in simple cases such as this, you can use it without specifying element type. withUnsafeMutableBytes(_:)
被声明为泛型方法,因此,在这种简单的情况下,您可以在不指定元素类型的情况下使用它。
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