Swift 字符串替换/过滤/切割/拼接

原创blog，转载请注明出处
blog.csdn.net/hello_hwc

之前写过一篇Swift String的基础，想了解的同学可以看下。
http://blog.csdn.net/hello_hwc/article/details/39853023

替换

把?替换为/

var url = "http://blog.csdn.net/hello_hwc?viewmode=list"

var filtered = url.stringByReplacingOccurrencesOfString("?", withString: "/", options: NSStringCompareOptions.LiteralSearch, range: nil)

结果

"http://blog.csdn.net/hello_hwc/viewmode=list"

过滤

过滤掉单个字符/

var url = "http://blog.csdn.net/hello_hwc?viewmode=list"

var filtered = url.stringByReplacingOccurrencesOfString("/", withString: "", options: NSStringCompareOptions.LiteralSearch, range: nil)

结果

"http:blog.csdn.nethello_hwc?viewmode=list"

过滤掉开头和结尾的空白

var url = "   http://blog.csdn.net/hello_hwc?viewmode=list   "
var newString = url.stringByTrimmingCharactersInSet(NSCharacterSet.whitespaceCharacterSet())

结果

"http://blog.csdn.net/hello_hwc?viewmode=list"

切割

对字符串使用/作为分隔符来切割，不允许空字符串
使用split函数

var url = "http://blog.csdn.net/hello_hwc?viewmode=list"
let splitedarray = split(url){$0 == "/"}

结果是一个数组

"http:"
"blog.csdn.net"
"hello_hwc?viewmode=list"

对字符串使用/作为分隔符来切割，允许空字符串

var url = "http://blog.csdn.net/hello_hwc?viewmode=list"
let arrayresult = split(url, maxSplit:url.lengthOfBytesUsingEncoding(NSUTF8StringEncoding), allowEmptySlices: true) { (char:Character) -> Bool in
    return char == "/"
}

结果

"http:"
""
"blog.csdn.net"
"hello_hwc?viewmode=list"

拼接

let splitedarray = ["1","2","3"]
let result = join("/", splitedarray)

结果

"1/2/3"