objective-c - 如何将 CVPixelBufferGetBaseAddress 调用转换为 Swift？

Question

也许我是第一个在 Swift 中这样做的人，但网上似乎没有任何东西在 Swift 中使用 &/inout 和 uint8_t。有人可以翻译这个吗？这种关系是按位的吗？

Objective-C

uint8_t *buf=(uint8_t *) CVPixelBufferGetBaseAddress(cvimgRef);

快速尝试

let inout buf:uint8_t = SOMETHING HERE CVPixelBufferGetBaseAddress(cvimgRef)

Answer 1

CVPixelBufferGetBaseAddress()返回 UnsafeMutablePointer<Void> , 可以转换为 UInt8指针通过

let buf = UnsafeMutablePointer<UInt8>(CVPixelBufferGetBaseAddress(pixelBuffer))

更新 Swift 3 (Xcode 8)，检查 Swift 5 (Xcode 11):

if let baseAddress = CVPixelBufferGetBaseAddress(pixelBuffer) {
    let buf = baseAddress.assumingMemoryBound(to: UInt8.self)
    // `buf` is `UnsafeMutablePointer<UInt8>`
} else {
    // `baseAddress` is `nil`
}