获取重复字符串的range,设置attributedText

之前项目的需求是未读人员显示绿色,已读人员显示黑色,测试今天提bug说存在未读人员显示的黑色...这就尴尬了,我完全不知道为啥,经过打断点调试程序,终于找到问题:就是他只会获取到第一个想等字符的range,知道问题所在就简单了,下面是我的demo:

//
//  ViewController.m
//  demo
//
//  Created by 思 彭 on 17/2/15.
//  Copyright © 2017年 思 彭. All rights reserved.
//

#import "ViewController.h"

@interface ViewController ()

@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.
    
    NSMutableArray *arr = [self getRangeStr:@"dndjnjajnjnjfnandjefnrjandrfnra" findText:@"a"];
    UILabel *label = [[UILabel alloc]initWithFrame:CGRectMake(100, 100, 100, 60)];
    [self.view addSubview:label];
    
    // 将label上的text中的a字符标志绿色,其余黑色
    label.attributedText =  [self redStringWithText:@"njfenfjenfeffee" WithArray:@[@"e",@"e", @"a", @"r"]];
}

- (NSMutableAttributedString *)redStringWithText:(NSString *)text WithArray:(NSArray *)array {
    NSDictionary *attribs = @{
                              NSForegroundColorAttributeName:[UIColor blackColor],
                              NSFontAttributeName:[UIFont systemFontOfSize:13]
                              };
    NSMutableAttributedString *attributedText =
    [[NSMutableAttributedString alloc] initWithString:text
                                           attributes:attribs];
    for (int i = 0; i < array.count; i++) {
        //        NSRange redTextRange =[text rangeOfString:array[i]];
        NSMutableArray *rangeArray =  [self getRangeStr:text findText: array[i]];
        for (NSInteger i = 0; i < rangeArray.count; i++) {
            NSValue *value = rangeArray[i];
            [attributedText setAttributes:@{NSForegroundColorAttributeName:[UIColor greenColor],NSFontAttributeName:[UIFont systemFontOfSize:13]} range:[value rangeValue]];
        }
    }
    return attributedText;
}

// 获取重复字符的range

- (NSMutableArray *)getRangeStr:(NSString *)text findText:(NSString *)findText
{
    NSMutableArray *arrayRanges = [NSMutableArray arrayWithCapacity:20];
    if (findText == nil && [findText isEqualToString:@""]) {
        return nil;
    }
    NSRange rang = [text rangeOfString:findText];
    if (rang.location != NSNotFound && rang.length != 0) {
        [arrayRanges addObject:[NSValue valueWithRange:rang]];
        NSRange rang1 = {0,0};
        NSInteger location = 0;
        NSInteger length = 0;
        for (int i = 0;; i++)
        {
            if (0 == i) {
                location = rang.location + rang.length;
                length = text.length - rang.location - rang.length;
                rang1 = NSMakeRange(location, length);
            }else
            {
                location = rang1.location + rang1.length;
                length = text.length - rang1.location - rang1.length;
                rang1 = NSMakeRange(location, length);
            }
            rang1 = [text rangeOfString:findText options:NSCaseInsensitiveSearch range:rang1];
            if (rang1.location == NSNotFound && rang1.length == 0) {
                break;
            }else
                [arrayRanges addObject:[NSValue valueWithRange:rang1]];
        }
        return arrayRanges;
    }
    return nil;
}


@end

很详细,记录一下!!