如何将NSNumber转换为NSData？

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问题描述

我需要使用 sendDataToAllPeers传输通过的GameKit整数：withDataMode：错误：，但我不知道怎么我的NSNumber转换为NSData的才能发送。我目前有：

I need to transmit an integer through GameKit using sendDataToAllPeers:withDataMode:error: but I don't know how to convert my NSNumber to NSData in order to send. I currently have:

NSNumber *indexNum = [NSNumber numberWithInt:index];
[gkSession sendDataToAllPeers:indexNum withDataMode:GKSendDataReliable error:nil];

但很明显，在我发送之前，indexNum需要转换为NSData。有谁知道怎么做？

but obviously the indexNum needs to be converted to NSData before I can send it. Does anyone know how to do this please?

谢谢！

推荐答案

对于这样一个简单的任务，我不推荐 NSKeyedArchiver ，因为它会在它上面添加PLIST开销和类版本。

I would not recommend NSKeyedArchiver for such a simple task, because it adds PLIST overhead on top of it and class versioning.

包装：

NSUInteger index = <some number>;
NSData *payload = [NSData dataWithBytes:&index length:sizeof(index)];

发送：

[session sendDataToAllPeers:payload withDataMode:GKSendDataReliable error:nil];

解包（在GKSession接收处理程序中）：

Unpack (in the GKSession receive handler):

NSUInteger index;
[payload getBytes:&index length:sizeof(index)];

Swift

var i = 123
let data = NSData(bytes: &i, length: sizeof(i.dynamicType))

var i2 = 0
data.getBytes(&i2, length: sizeof(i2.dynamicType))

print(i2) // "123"

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