当没有分配给联系人的电话时，获取联系人不会崩溃

Question

I am trying to read the contact phone no. The below code works fine if the number is available but if there are no phone no assigned to the contact , it is crashing. Can Anu let me know how to handle this.

((currentContact.phoneNumbers.first?.value)! as CNPhoneNumber).stringValue

Answer 1

You should learn about optional values in Swift...

if let contactPhoneNumber = currentContact.phoneNumbers.first?.value?.stringValue {
    // do something with the value
} 
else {
    // the value isn't there 
}