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Swiftで任意の文字列が含まれるか判定

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var str : String = "hello Swift"

if str.containsString("Swift") { // -> true
    print("Swiftが含まれる")
}

if str.containsString("swift") { // -> false
    //ここには来ない
}

//大文字小文字を無視させて評価
if str.lowercaseString.containsString("swift") { // -> true
    print("swiftが含まれる")
}

//これも同様にcaseを無視
if str.localizedCaseInsensitiveContainsString("HELLO"){ // -> true
    print("HELLOが含まれる")
}

Swift3

var str : String = "hello Swift"

if str.contains("Swift") { // -> true
    print("Swiftが含まれる")
}

if str.contains("swift") { // -> false
    //ここには来ない
}

//大文字小文字を無視させて評価
if str.lowercased().contains("swift") { // -> true
    print("swiftが含まれる")
}

//これも同様にcaseを無視
if str.localizedCaseInsensitiveContains("HELLO"){ // -> true
    print("HELLOが含まれる")
}
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