如何在一個字符串中尋找到你想要的字符串(目標(biāo)字符串)的所有位置?

例如: 在下面字符串中找到所有"我是"的 range

string = "...我是....是,,,,,...我是,,.是,,..我是...不...是,,,,.我...,,我是.."

swift4.2

    func findAimstrAllRange(baseStr : NSString, aimStr: String, baseRange : NSRange, result : inout Array<NSRange>) -> Array<NSRange> {

        let range = baseStr.range(of: aimStr, options: NSString.CompareOptions.literal, range: baseRange)
        //找到
        if range.length > 0{
            result.append(range)
            let detectLength = range.location + range.length
            let rangeNew = NSRange(location: detectLength, length: baseStr.length - detectLength)
            _ = findAimstrAllRange(baseStr: baseStr, aimStr: aimStr, baseRange: rangeNew, result: &result)
        }
        return result
    }

//使用
    let baseStr = "...我是....是,,,,,...我是,,.是,,..我是...不...是,,,,.我...,,我是.." as NSString
    let aimStr = "我是"
    var rangeArr = Array<NSRange>()
    let result = findAimstrAllRange(baseStr: baseStr, aimStr: aimStr, baseRange: NSRange(location:0, length: baseStr.length), result: &rangeArr)
    print(result)
    

Objective-C

- (void)viewDidLoad {
    [super viewDidLoad];
    NSString *baseStr = @"...我是....是,,,,,...我是,,.是,,..我是...不...是,,,,.我...,,我是..";
    NSString *aimStr = @"我是";
    NSMutableArray *result = [NSMutableArray array];
    result =  [self findAimstrAllRangeWithBaseStr:baseStr andAimStr:aimStr andBaseRange:NSMakeRange(0, baseStr.length) resultArr:result];
    NSLog(@"%@",result);
}



-(NSMutableArray *)findAimstrAllRangeWithBaseStr:(NSString *)baseStr andAimStr:(NSString*)aimStr andBaseRange:(NSRange)baseRange resultArr:(NSMutableArray *)resultArr
{
   
    NSRange range = [baseStr rangeOfString:aimStr options:NSLiteralSearch range:baseRange];
    if (range.length > 0) {
        [resultArr addObject:NSStringFromRange(range)];
        NSUInteger nextLocation = range.location + range.length;
        NSRange rangeNew = NSMakeRange(nextLocation, baseStr.length - nextLocation);
        [self findAimstrAllRangeWithBaseStr:baseStr andAimStr:aimStr andBaseRange:rangeNew resultArr:resultArr];
    }
    return resultArr;
}

應(yīng)用案例

實現(xiàn)微信點贊列表, 點擊人名對應(yīng)跳轉(zhuǎn)相應(yīng)的個人界面
方式一: label 中實現(xiàn)點擊文字: 使用 YYLabel(需要傳遞 range 參數(shù))
方式二: UITextView 實現(xiàn)點擊文字,原生方法(同樣需要 range 參數(shù))

//稍微對上述方法進(jìn)行修改
 func findAimstrAllRange(baseStr : NSString, aimStr: String, baseRange : NSRange, result : inout Array<NSRange>) -> Array<NSRange> {

        let range = baseStr.range(of: aimStr, options: NSString.CompareOptions.literal, range: baseRange)

        if result.contains(range) == false {
            result.append(range)
            return result
        }else{
            //找到
            if range.length > 0{
                let detectLength = range.location + range.length
                let rangeNew = NSRange(location: detectLength, length: baseStr.length - detectLength)
                _ = findAimstrAllRange(baseStr: baseStr, aimStr: aimStr, baseRange: rangeNew, result: &result)
            }
        }
        return result
    }



 let testArr = ["小明","小紅","小綠","小紅","小花","小明"]

//把人名數(shù)組通過 split 變成 baseStr
 let baseStr = "小明,小紅,小綠,小紅,小花,小明" as NSString
 var rangeArr = Array<NSRange>()
 for str in testArr{
       let arr = findAimstrAllRange(baseStr: baseStr, aimStr: str, baseRange: NSRange(location:0, length: baseStr.length), result: &rangeArr)
       print("姓名 = \(str)" + ", 位置 = \(String(describing: arr.last))")
 }


//知道 range 后就可以在對應(yīng)的 range 上添加點擊方法,并且添加 attribute 
baseAttributeStr.addAttribute(NSAttributedString.Key.link, value:(用戶 id, 或者其他數(shù)據(jù)), range: range)