快速错误的字符串init(格式…方法？[复制]

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
//Fatal error: can't unsafeBitCast between types of different sizes
//this is what I need
let str = String(format: format,arguments: array)

//only this works with the right output
//1 != 2
let 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 Foundation

let 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.