How to check dictionary value is empty or not - swift

Question

i am new to swift and facing little issue and i not understanding how to check dictionary value.
func doValidate(data:Dictionary<String,AnyObject>,isEmail : String) -> Bool {
if(isEmail=="signup"){
if( data["last_name"] == nil || data["email"] == nil || data["password"] == nil || data["first_name"] == nil){
return false;
}
else{
return true;
}
}
}
Dictionary key is always constant and every time dictionary key exists but how i can check
value of data["last_name"] is empty or not?
if i used loop then its working but why single value not work?
for( myKey,myValue ) in data {
if(myValue as! String == ""){ // Work Perfect
return false;
}
}

Answer 1

For checking the value use objectForKey()
Here is modified code
func doValidate(data:Dictionary<String,AnyObject>,isEmail : String) -> Bool {
if(isEmail=="signup"){
if( data.objectForKey("last_name") == nil || data.objectForKey("email") == nil || data.objectForKey("password") == nil || data.objectForKey("first_name") == nil){
return false;
}
else{
return true;
}
}
}

Answer 2

You could consider the syntax introduced with Swift 1.2 inverting your if logic, obtaining something like this:
func doValidate(data:Dictionary<String,AnyObject>,isEmail : String) -> Bool {
if(isEmail == "signup"){
if let lastName = data["last_name"] as? String,
let email = data["email"] as? String,
let password = data["password"] as? String,
let firstName = data["first_name"] as? String
where
!lastName.isEmpty &&
!email.isEmpty &&
!password.isEmpty &&
!firstName.isEmpty {
return true
}
}
return false
}

Answer 3

Check length if you wanna check your string value. for example
func doValidate(data:Dictionary<String,AnyObject>,isEmail : String) -> Bool {
if(isEmail=="signup"){
if( data["last_name"]?.length == 0 || data["email"]?.length == 0 || data["password"]?.length == 0 || data["first_name"]?.length == 0){
return false;
}
else{
return true;
}
}
}