unwrapping multiple optionals in if statement

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鱼传尺愫
鱼传尺愫 2020-11-28 07:38

I want to unwrap two optionals in one if statement, but the compiler complaints about an expected expression after operator at the password constant. What could be the reaso

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  •  无人及你
    2020-11-28 08:05

    Great news. Unwrapping multiple optionals in a single line is now supported in Swift 1.2 (XCode 6.3 beta, released 2/9/15).

    No more tuple/switch pattern matching needed. It's actually very close to your original suggested syntax (thanks for listening, Apple!)

    if let email = emailField?.text, password = passwordField?.text {
    
    }
    

    Another nice thing is you can also add where for a "guarding condition":

    var email: String? = "baz@bar.com"
    var name: String? = "foo"
    
    if let n = name, e = email where contains(e, "@") {
      println("name and email exist, email has @")
    }
    

    Reference: XCode 6.3 Beta Release Notes

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