swift - 参数标签 '(stringInterpolationSegment:)' 不匹配任何可用的重载

Question

更新最新的 Xcode 版本 10.2 (10E125) 后，出现此错误:

参数标签“(stringInterpolationSegment:)”不匹配任何可用的重载

还没有找到任何解决方案，有什么想法吗？

let interpolation1 = String(stringInterpolationSegment:self.addSpotAnnotation!.coordinate.latitude)
let interpolation2 = String(stringInterpolationSegment:self.addSpotAnnotation!.coordinate.longitude)
let coordinate:String = interpolation1 + "," + interpolation2

Answer 1

错误是由于changes了解字符串插值在 Swift 5 中的工作原理。

解决方案是不将String(stringInterpolationSegment:)替换为String(stringInterpolation:):

We do not propose preserving existing init(stringInterpolation:) or init(stringInterpolationSegment:) initializers, since they have always been documented as calls that should not be used directly. [emphasis added]

你举的例子:

coordinate:String = 
      String(stringInterpolationSegment: self.addSpotAnnotation!.coordinate.latitude) 
    + "," 
    + String(stringInterpolationSegment: self.addSpotAnnotation!.coordinate.longitude)

可以更容易地写成:

let coordinate = "\(self.addSpotAnnotation!.coordinate.latitude),\(self.addSpotAnnotation!.coordinate.longitude)"