快速错误的字符串init(格式…方法？[复制]

概述参见英文答案 > cannot find an initializer for type ‘String’ that accepts an argument list of type ‘(format: String, argument: UInt32                                    1个 let elem1 = "1"let elem2 = "2"let 参见英文答案 > cannot find an initializer for type ‘String’ that accepts an argument list of type ‘(format: String,argument: UInt321个

let elem1 = "1"let elem2 = "2"let array = [elem1,elem2]let format = "%@ != %@"//compiler error//can't find an initializer for type...let str = String(format: format,arguments: elem1,elem2)//no errors but wrong output//("%@ != %@","1","2")let str = String(format: format,_arguments: elem1,elem2)//runtime error//@R_404_2905@: can't unsafeBitCast between types of different sizes//this is what I needlet str = String(format: format,arguments: array)//only this works with the right output//1 != 2let str = String(format: format,arguments: [elem1,elem2])print(str)

在xcode7 beta和xcode6.3中测试过,我现在找不到解决方法

使用此语法(XCode 7)：

import Foundationlet elem1 = "1"let elem2 = "2"let format = "%@ != %@"let str = String(format: format,elem1,elem2) // "1 !=2"print(str) // "1 != 2\n"

诀窍是用格式指定重载的ctor：并跳过参数：all all.

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