从字符串数组中筛选最长字符串
func getLongestStringFromArray(strArray:NSArray)->String
{
var string = ""
for(var j=0;j<strArray.count;j += 1)
{
if(strArray[j].length > string.length)
{
string = strArray[j] as! String
}
}
return string
}
字符串部分加粗显示
func changePartOfStringToBold(allString:String,boldString:String,fontSize:CGFloat)->NSMutableAttributedString
{
let attriStr:NSMutableAttributedString = NSMutableAttributedString(string:allString)
let boldRange = NSMakeRange(NSString(string: allString).rangeOfString(boldString).location,NSString(string: allString).rangeOfString(boldString).length)
attriStr.addAttribute(NSFontAttributeName,value: UIFont(name: "Helvetica-Bold",size: fontSize)!,range: boldRange)
return attriStr
}
字符串部分字符显示不同颜色
func changePartOfStringStyle(allString:String,rangeString:String,isBold:Bool,fontSize:CGFloat)->NSMutableAttributedString
{
let attriStr:NSMutableAttributedString = NSMutableAttributedString(string:allString)
let range = NSMakeRange(NSString(string: allString).rangeOfString(rangeString).location,NSString(string: allString).rangeOfString(rangeString).length)
attriStr.addAttribute(NSForegroundColorAttributeName,value: UIColor.redColor(),range: (range ))
if(isBold == true)
{
attriStr.addAttribute(NSFontAttributeName,range: range)
}
return attriStr
}
取字符串某一个字符后的部分（如：小数点后的字符）
let str = "13.123"
let strArray = str.componentsSeparatedByString(".")
let str2 = Array[1]
查找指定字符位置，及获得指定范围的子字符串
let source = "abcdefg"
let str = "c"
let range = NSMakeRange(2,1)
let subRange = (source as NSString).rangeOfString(str) //子范围
let subString = (source as NSString).substringWithRange(range) //子字符串
