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Swift TableView

2024-07-09 23:03:14   223人阅读

 

 

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 UIKitclass ViewController: UITableViewController {        var familyNames : Array<String> = []    var fonts : Dictionary<String, String[]> = [:]        init(coder aDecoder: NSCoder!)    {        super.init(coder: aDecoder)                let unsortedFamilyNames = UIFont.familyNames() as String[]        familyNames = sort(unsortedFamilyNames)                for familyName in familyNames        {            let unsortedFontNames = UIFont.fontNamesForFamilyName(familyName) as String[]            fonts[familyName] = sortFontNames(unsortedFontNames)        }    }        override func numberOfSectionsInTableView(tableView: UITableView!) -> Int    {        return countElements(familyNames)    }        override func tableView(tableView: UITableView!, numberOfRowsInSection section: Int) -> Int    {        let key = familyNames[section]        let array = fonts[key]        return array!.count    }        override func tableView(tableView: UITableView!, cellForRowAtIndexPath indexPath: NSIndexPath!) -> UITableViewCell!    {        let cell = tableView.dequeueReusableCellWithIdentifier("cell", forIndexPath: indexPath) as UITableViewCell                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())                return cell    }        override func 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()                return max(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[]    {        return sort(array, { (s1: String, s2: String) -> Bool in            // if s1 doesn‘t contain a hyphen, it should appear before s2            let count1 = countElements(s1.componentsSeparatedByString("-"))            if count1 == 1            {                return true            }                        // if s2 doesn‘t contain a hyphen, it should appear before s1            let count2 = countElements(s2.componentsSeparatedByString("-"))            if count2 == 1            {                return false            }                        // otherwise, a normal string compare will be fine            return s1 > s2            })    }}

 


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