Swift-使用drawInRect:withAttributes绘制文本:

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:(

回答:

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:

if let actualFont = font {

let textFontAttributes = [

NSFontAttributeName: actualFont,

NSForegroundColorAttributeName: textColor,

NSParagraphStyleAttributeName: textStyle

]

text.drawInRect(NSOffsetRect(textRect, 0, 1), withAttributes: textFontAttributes)

}

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