無法爲類型'UnsafeMutablePointer'<uint8>'使用類型爲'（UnsafeMuatableRawpointer？）'的參數列表調用初始值設定項'

Question

我試圖將我的項目更新爲swift 3.0，並且在UnsafeMutablePointer中遇到了問題。

這裏是我的錯誤

Cannot invoke initializer for type 'UnsafeMutablePointer<uint8>' with an argument list of type '(UnsafeMuatableRawpointer?)' 

代碼：

let imageBuffer = CMSampleBufferGetImageBuffer(sampleBuffer) 
let src_buff = CVPixelBufferGetBaseAddress(imageBuffer!) 
let dataBuffer = UnsafeMutablePointer<UInt8>(src_buff) //error here 

爲什麼呢？如何解決它？

Answer 1

從空指針（又名UnsafeMutableRawPointer）將在斯威夫特3.改變你有2種選擇：

如果你知道你的緩衝區長度（更安全）：

let dataBuffer = src_buff?.bindMemory(to: UInt8.self, capacity: len) 

如果你不知道它：

let dataBuffer = src_buff?.assumingMemoryBound(to: UInt8.self)