我正在尝试想出一种从HTML页面提取图像的方法。(我还没有查找实际操作,我只是试图从零开始构思,所以不要评判)无论如何,到目前为止我编写的代码出现了错误:
“无法将类型为Range<Index>?的值分配给类型为Range<Int>?”
//variable "html" has type String
let variations = ["img","IMG","Img"]
var tagStart: Range<Int>?
var index = 0
repeat
{
tagStart = html.rangeOfString(variations[index]) //Cannot assign a value of type Range<Index>? to a value of type Range<Int>?
index += 1
}while( tagStart == nil );
好的,所以Range类型由Index组成,而不是Int。但是当我尝试更改声明时,我收到了一个"使用未声明的类型'Index'"
错误。现在它告诉我Index只存在于我的想象中?
//variable "html" has type String
let variations = ["img","IMG","Img"]
var tagStart: Range<Index>?
var index = 0
repeat
{
tagStart = html.rangeOfString(variations[index]) //"Use of undeclared type 'Index'"
index += 1
}while( tagStart == nil );