上面這些是一些基本的設置,然後提前補充幾個知識點!
類後面的!作用是強制類型轉換
NSCoder是一個抽象類,是字節流的抽象類,我們可以把數據寫入一個coder也可以從coder中讀出數據!
as也可以類型為類型轉換
Swift中sort函數有兩種用法,在編譯器中輸入sort查看幫助文檔有相信解釋!
建議觀看Swift language 函數章節
import UIKit class 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. */ /* 這個函數是必要的,因為字體不總是按字母順序排序。 例如,ArialMT應該Arial-BoldItalicMT之前, 但是如果我們按字母順序排序,ArialMT就不會在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 }) } }