我之前曾在Swift 4.2中使用此代码生成id:
public static func generateId() throws -> UInt32 {
let data: Data = try random(bytes: 4)
let value: UInt32 = data.withUnsafeBytes { $0.pointee } // deprecated warning!
return value // + some other stuff
}
Swift 5.0不推荐使用withUnsafeBytes.我该怎么解决这个问题？
在Swift 5中，Data的withUnsafeBytes()方法使用(非类型化)UnsafeRawBufferPointer调用闭包，您可以从原始内存中获取load()个值:
let value = data.withUnsafeBytes { $0.load(as: UInt32.self) }
(在Swift论坛中比较How to use Data.withUnsafeBytes in a well-defined manner?).请注意，这要求内存在4字节边界上为aligned.有关替代方案，请参见round trip Swift number types to/from Data.
另外请注意，从Swift 4.2开始，只需使用新的Random API即可创建一个随机的32位整数:
let randomId = UInt32.random(in: .min ... .max)