Save NSMutableArray with Class to Plist File in Swift - ios

Question

Hey I just want to save my NSMutableArray with Class. But When i try to read the file my app getting crush. I found this and i tried to convert for NSMutableArray. Now I cant figure out what can i do.
My Class:
class Customer {
var name = String()
var email = String()
var phoneNumber = Int()
var bAdd = String()
var bAdd2 = String()
var sAdd = String()
var sAdd2 = String()
init(name: String, email: String, phoneNumber: Int, bAdd: String, bAdd2: String, sAdd: String, sAdd2: String) {
self.name = name
self.email = email
self.phoneNumber = phoneNumber
self.bAdd = bAdd
self.bAdd2 = bAdd2
self.sAdd = sAdd
self.sAdd2 = sAdd2
}
class func exists (path: String) -> Bool {
return NSFileManager().fileExistsAtPath(path)
}
class func read (path: String) -> NSMutableArray? {
if Customer.exists(path) {
return NSMutableArray(contentsOfFile: path)!
}
return nil
}
class func write (path: String, content: NSMutableArray) -> Bool {
return content.writeToFile(path, atomically: true)
}
}
My Array:
var ItemData:NSMutableArray = NSMutableArray()
and My Read Code:
let documents = NSSearchPathForDirectoriesInDomains(.DocumentDirectory, .UserDomainMask, true)[0] as! String
let customerPath = documents.stringByAppendingPathComponent("Test.plist")
ItemData = Customer.read(customerPath)!
When i tried to read im gettin this crash:
fatal error: unexpectedly found nil while unwrapping an Optional value
(lldb)
Any Advice?

Answer 1

Your code works perfectly fine except that you do not actually have anything to read from in the beginning, therefore Customer.read(customerPath) returns nil, which you try to unwrap - therefore the error.
If you just write something beforehand and then try to read it again like this, everything works fine.
ItemData.addObject("aisnd")
Customer.write(customerPath, content: ItemData)
ItemData = Customer.read(customerPath)!
Of course that is not the way to actually do it, because it is normal that you don't have anything present in the beginning. Therefore you have to check wether or not the read function actually returns something useful:
var ItemData:NSMutableArray = NSMutableArray()
if let item = Customer.read(customerPath) {
ItemData = item
} else {
print("no value found")
}
Final note 1 because playground suggested it: remove the ! from the as! String. Final note 2: don't start variable names uppercase, the variable should be called itemData.
Edit
To write Customer objects you have to do something like this.