错误：

enumerate is unavailable call the enumerate method on the sequence

func layoutSpecialKeysRow(row: [Key],keyWidth: CGFloat,gapWidth: CGFloat,leftSideRatio: CGFloat,rightSideRatio: CGFloat,micButtonRatio: CGFloat,isLandscape: Bool,frame: CGRect) -> [CGRect] {
    var frames = [CGRect]()

    var keysBeforeSpace = 0
    var keysAfterSpace = 0
    var reachedSpace = false
    for _k,key) in enumerate(row) {
        if key.type == Key.KeyType.Space {
            reachedSpace = true
        }
        else {
            if !reachedSpace {
                keysBeforeSpace += 1
            }
            else {
                keysAfterSpace += 1
            }
        }
    }