iOS常用技术-微博字符串的截取

//
//  NSString+Range.h
//  字符串作业
//
//  Created by andezhou on 15/12/17.
//  Copyright © 2015年 周安德. All rights reserved.
//

#import <Foundation/Foundation.h>

@interface NSString (Range)

// 截取话题##
- (NSArray *)queryTopicFromString:(NSString *)topic;

// 截取表情符号[]
- (NSArray *)querySmiliesFromString:(NSString *)fromStr
                         toStr:(NSString *)toStr;

// 截取@name
- (NSArray *)queryName;

@end

/*************************************************/

//
//  NSString+Range.m
//  字符串作业
//
//  Created by andezhou on 15/12/17.
//  Copyright © 2015年 周安德. All rights reserved.
//

#import "NSString+Range.h"

@implementation NSString (Range)

// 截取话题##
- (NSArray *)queryTopicFromString:(NSString *)topic
{
    // 初始化一个存放range的数组
    NSMutableArray *array = [NSMutableArray array];
    return [self queryStringFrom:topic to:topic array:array];
}

// 截取表情符号[]
- (NSArray *)querySmiliesFromString:(NSString *)fromStr
                         toStr:(NSString *)toStr
{
    NSMutableArray *array = [NSMutableArray array];
    return [self queryStringFrom:fromStr to:toStr array:array];
}

// 截取@name
- (NSArray *)queryName
{
    NSMutableArray *array = [NSMutableArray array];
    return [self queryStringFrom:@"@" to:@" " array:array];
}

- (NSArray *)queryStringFrom:(NSString *)from to:(NSString *)to array:(NSMutableArray *)array
{
    // 获取开始#所在的位置
    NSRange fromRange = [self rangeOfString:from];
    
    if (fromRange.location != NSNotFound) {
        // 获取开始索引
        NSUInteger fromIndex = fromRange.location + fromRange.length;
        // 从索引开始截取字符串
        NSString *fromStr = [self substringFromIndex:fromIndex];
        
    
        // 获取与#所对应的#的位置
        NSRange toRange = [fromStr rangeOfString:to];
        
        // 判断所对应的#是否存在
        if (toRange.location != NSNotFound) {
            // 得到##之间的标题
            NSString *str = [fromStr substringToIndex:toRange.location];
            // 得到完整的标题字符串，如#大学是所整容院#
            NSString *string = [NSString stringWithFormat:@"%@%@%@", from, str, to];
            NSLog(@"string:%@", string);

            // 得到完成的标题字符串在字符串中的位置
            NSRange range = [self rangeOfString:string];
            
            // 先判断上一个是否存在
            NSValue *value = [array lastObject];
            if (value.rangeValue.length) {
                // 当前话题的range中的位置添加上上一个话题的range的位置和长度
                NSUInteger location = value.rangeValue.length + value.rangeValue.location;
                range = NSMakeRange(range.location + location, range.length);
            }
            
            // 把range转化为NSValue存放在数组中
            [array addObject:[NSValue valueWithRange:range]];

            // 获取标题##后面的内容
            NSString *nextStr = [fromStr substringFromIndex:toRange.location + toRange.length];
            
            // 递归继续查询
            [nextStr queryStringFrom:from to:to array:array];
        }
    }
    
    return array;
}

@end

/*******************************************************************/

//
//  ViewController.m
//  作业
//
//  Created by andezhou on 16/1/4.
//  Copyright (c) 2016年 周安德. All rights reserved.
//

#import "ViewController.h"
#import "NSString+Range.h"

@interface ViewController ()

@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    NSString *str = @"哈哈#大学是所整容院# 岁月是把杀猪刀还是整容刀[/尴尬],最近网友纷纷/晒出自己大学前后的对比照，简直集体整容的节奏[/开心]。@球球 你说对不对呢？[/阴险] #开心一刻# @小明 #你会不会# 啊 我不会啊。";
    
    
    NSArray *topicArray = [str queryTopicFromString:@"#"];
    NSArray *nameArray = [topicArray arrayByAddingObjectsFromArray:[str queryName]];
    NSArray *smilieArray = [nameArray arrayByAddingObjectsFromArray:[str querySmiliesFromString:@"[/" toStr:@"]"]];
    
    NSMutableAttributedString *mutString = [[NSMutableAttributedString alloc] initWithString:str];
    // 给添加颜色
    for (NSValue *value in smilieArray) {
        NSRange range = value.rangeValue;
        [mutString addAttributes:@{
                                   NSForegroundColorAttributeName : [UIColor blueColor]
                                   }
                           range:range];
    }
    
    UILabel *lab = [[UILabel alloc] initWithFrame:CGRectMake(10, 100, 0, 0)];
    lab.numberOfLines = 0;
    lab.attributedText = mutString;
    CGSize size = [lab sizeThatFits:CGSizeMake(self.view.frame.size.width - 20, MAXFLOAT)];
    lab.frame = CGRectMake(10, 100, size.width, size.height);
    [self.view addSubview:lab];
    
    // Do any additional setup after loading the view, typically from a nib.
}

- (void)didReceiveMemoryWarning {
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

@end

/**********************************************************************/