I want to append two NSData:
var actionIdData :NSData = NSData(bytes: &actionId, length: 2)
var payLoad : NSData = NSData(bytes: &message, length: 9)
var messageData : NSMutableData!
messageData.appendData(actionIdData)
messageData.appendData(actionIdData)
fatal error: unexpectedly found nil while unwrapping an Optional value
Compatible with both Swift 4 and Swift 5 you can only use append
function of Data
to append two different data.
Sample Usage
guard var data1 = "data1".data(using: .utf8), let data2 = "data2".data(using: .utf8) else {
return
}
data1.append(data2)
// data1 is now combination of data1 and data2
You need to initialize your messageData
before appending to it.
var messageData = NSMutableData() //or var messageData : NSMutableData = NSMutableData()
messageData.appendData(actionIdData)
messageData.appendData(payLoad)
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