This question already has an answer here:
这个问题在这里已有答案:
- round trip Swift number types to/from Data 3 answers
往返数据3答案的往返Swift数字类型
There're a lot of sources explaining how to make it in Swift 2 which I took as a base:
有很多消息来源解释如何在Swift 2中制作它作为基础:
var value: Int = 0
let data: NSData = ...;
data.getBytes(&value, length: sizeof(Int))
Then I updated syntax/naming due to Swift 3:
然后我更新了Swift 3的语法/命名:
var value: Int = 0
let data: NSData = ...;
data.copyBytes(to: &value, count: MemoryLayout<Int>.size)
Nevertheless it doesn't work. The compiler doesn't like the type of value, it says it should be UInt8. But I want Int. Anybody knows how can I achieve this?
然而它不起作用。编译器不喜欢值的类型,它说它应该是UInt8。但是我想要Int。谁知道我怎么能做到这一点?
1 个解决方案
#1
6
Maybe try like this:
也许尝试这样:
var src: Int = 12345678
var num: Int = 0 // initialize
let data = NSData(bytes: &src, length: MemoryLayout<Int>.size)
data.getBytes(&num, length: MemoryLayout<Int>.size)
print(num) // 12345678
#1
6
Maybe try like this:
也许尝试这样:
var src: Int = 12345678
var num: Int = 0 // initialize
let data = NSData(bytes: &src, length: MemoryLayout<Int>.size)
data.getBytes(&num, length: MemoryLayout<Int>.size)
print(num) // 12345678