ios - String is not convertible to Range<I> swift anyone 错误

Question

 func setupAvatarColor(name: String, incoming: Bool) {
        let diameter = incoming ? UInt(collectionView.collectionViewLayout.incomingAvatarViewSize.width) : UInt(collectionView.collectionViewLayout.outgoingAvatarViewSize.width)

        let rgbValue = name.hash
        let r = CGFloat(Float((rgbValue & 0xFF0000) >> 16)/255.0)
        let g = CGFloat(Float((rgbValue & 0xFF00) >> 8)/255.0)
        let b = CGFloat(Float(rgbValue & 0xFF)/255.0)
        let color = UIColor(red: r, green: g, blue: b, alpha: 0.5)

        **let nameLength = count(name);**
        let initials : String? = name.substringToIndex(advance(sender.startIndex, min(3, nameLength)))
        let userImage = JSQMessagesAvatarFactory.avatarWithUserInitials(initials, backgroundColor: color, textColor: UIColor.blackColor(), font: UIFont.systemFontOfSize(CGFloat(13)), diameter: diameter)

        avatars[name] = userImage
    }


I receiving the error '`String is not convertible to Range<I>'in the highlighted code (10th line)`. AnyOne?

Answer 1

在 Swift 2 中，Apple 删除了很多全局函数。

在您的情况下，要获取字符串的长度，请执行以下操作:

str.characters.count