代码来源 cocoachina推荐源码 26日
上面这些是一些基本的设置，然后提前补充几个知识点！
类后面的!作用是强制类型转换
NSCoder是一个抽象类，是字节流的抽象类，我们可以把数据写入一个coder也可以从coder中读出数据！
as也可以类型为类型转换
Swift中sort函数有两种用法，在编译器中输入sort查看帮助文档有相信解释！
建议观看Swift language 函数章节
import UIKitclassViewController: UITableViewController {
var familyNames : Array<String> =[]
var fonts : Dictionary<String, String[]> =[:]
init(coder aDecoder: NSCoder!)
{
super.init(coder: aDecoder)
let unsortedFamilyNames= UIFont.familyNames()asString[]
familyNames=sort(unsortedFamilyNames)forfamilyNameinfamilyNames
{
let unsortedFontNames= UIFont.fontNamesForFamilyName(familyName)asString[]
fonts[familyName]=sortFontNames(unsortedFontNames)
}
}overridefunc numberOfSectionsInTableView(tableView: UITableView!) ->Int
{returncountElements(familyNames)
}overridefunc tableView(tableView: UITableView!, numberOfRowsInSection section: Int) ->Int
{
let key=familyNames[section]
let array=fonts[key]returnarray!.count
}overridefunc tableView(tableView: UITableView!, cellForRowAtIndexPath indexPath: NSIndexPath!) -> UITableViewCell!{
let cell= tableView.dequeueReusableCellWithIdentifier("cell", forIndexPath: indexPath)asUITableViewCell
let key=familyNames[indexPath.section]
let array=fonts[key]
let fontName= array![indexPath.row]
cell.textLabel.text=fontName
cell.textLabel.font=UIFont(name:fontName, size: UIFont.systemFontSize())returncell
}overridefunc tableView(tableView: UITableView!, heightForRowAtIndexPath indexPath: NSIndexPath!) ->CGFloat
{
let key=familyNames[indexPath.section]
let array=fonts[key]
let fontName= array![indexPath.row]
let label= UILabel(frame: CGRectMake(0,0,280,200))
label.text=fontName
label.font=UIFont(name: fontName, size: UIFont.systemFontSize())
label.sizeToFit()returnmax(label.font.lineHeight + label.font.ascender + -label.font.descender,44)
}/*This function is necessary because fonts shouldn't always be sorted alphabetically.
For example, ArialMT should come before Arial-BoldItalicMT,
but if we sort alphabetically, it doesn't.*//*这个函数是必要的,因为字体不总是按字母顺序排序。
例如,ArialMT应该Arial-BoldItalicMT之前,
但是如果我们按字母顺序排序,ArialMT就不会在Arial-BoldItalicMT之前。*/func sortFontNames(array: String[])->String[]
{returnsort(array, { (s1: String, s2: String) -> Boolin//if s1 doesn't contain a hyphen, it should appear before s2let count1 = countElements(s1.componentsSeparatedByString("-"))ifcount1 ==1{returntrue}//if s2 doesn't contain a hyphen, it should appear before s1let count2 = countElements(s2.componentsSeparatedByString("-"))ifcount2 ==1{returnfalse}//otherwise, a normal string compare will be finereturns1 >s2
})
}
}