我对Xcode 6.1 GM有一个奇怪的问题。
let text: NSString = "A" let font = NSFont(name: "Helvetica Bold", size: 14.0) let textRect: NSRect = NSMakeRect(5, 3, 125, 18) let textStyle = NSMutableParagraphStyle.defaultParagraphStyle().mutableCopy() as NSMutableParagraphStyle textStyle.alignment = NSTextAlignment.LeftTextAlignment let textColor = NSColor(calibratedRed: 0.147, green: 0.222, blue: 0.162, alpha: 1.0) let textFontAttributes = [ NSFontAttributeName: font, NSForegroundColorAttributeName: textColor, NSParagraphStyleAttributeName: textStyle ] text.drawInRect(NSOffsetRect(textRect, 0, 1), withAttributes: textFontAttributes)
错误处在让texFontAttributes …
Cannot convert the expression's type 'Dictionary' to type 'DictionaryLiteralConvertible'
直到Xcode 6.1 GM,此代码才能正常工作。
当我尝试将textFontAttributes声明为NSDictionary时,错误消息更改为:
Cannot convert the expression's type 'NSDictionary' to type 'NSString!'
我不知道如何解决这个问题:(
问题在于这font是可选的,因为便利构造函数现在返回可选值,因此font需要将其解包为字典中的值:
font
if let actualFont = font { let textFontAttributes = [ NSFontAttributeName: actualFont, NSForegroundColorAttributeName: textColor, NSParagraphStyleAttributeName: textStyle ] text.drawInRect(NSOffsetRect(textRect, 0, 1), withAttributes: textFontAttributes) }