Swift 如何将多个枚举值作为函数参数传递

发布于06月06日

如何执行以下操作？在swift中将两个NSStringDrawing选项作为函数参数传递:

CGRect boundingRect = [string boundingRectWithSize:CGSizeMake(280.0, NSIntegerMax)
                                                      options:NSStringDrawingUsesLineFragmentOrigin | NSStringDrawingUsesFontLeading
                                                   attributes:options context:nil];

推荐答案

编辑:在Swift 3.0:

let options: NSStringDrawingOptions = [.usesLineFragmentOrigin, .usesFontLeading]

编辑:This is how you would use the options enum in Swift 2.0:

let options: NSStringDrawingOptions = [.UsesLineFragmentOrigin, .UsesFontLeading]

编辑:The issue 100:

Modified 100 [struct]

起始:enum NSStringDrawingOptions : Int

收件人:struct NSStringDrawingOptions : RawOptionSetType

你现在可以写:

let options : NSStringDrawingOptions = .UsesLineFragmentOrigin | .UsesFontLeading

经过一些研究和@Anton Tcholakov的" comments ":

如果你的目标是OS X 10.10，这是一个简单的方法:

let size = CGSize(width: 280, height: Int.max)
let options : NSStringDrawingOptions = .UsesLineFragmentOrigin | .UsesFontLeading

let boundingRect = string.bridgeToObjectiveC().boundingRectWithSize(size, options: options, attributes: attributes, context: nil)