枚举不可呼吁序列

Question

刚刚下载的Xcode 7测试版的枚举法，并拿出上罗列

错误此错误：

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 
      } 
     } 
    } 

Answer 1

在斯威夫特2，enumerate不一个全球性的功能，它是SequenceType的延伸。

把它直接在顺序列举如下：

for (index, key) in row.enumerate() { 
    // ... 
}