分享一个搜索历史工具类

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.h文件

#import <Foundation/Foundation.h>

@interface YPSearchTool : NSObject

@property (nonatomic, strong) NSMutableArray *SearchDataArray;
/**
 *    添加搜索历史
 *    @param searchStr 新加的输入条目
 */
+ (void)addSearchRecord:(NSString *)searchStr;

/**
 *    获取所有的搜索历史
 *    @return 搜索历史 字符数组
 */
+ (NSArray *)getAllSearchHistory;

/**
 *    清空搜索历史
 */
+ (void)clearAllSearchHistory;

@end

.m文件

#import "YPSearchTool.h"
#define RecordCount 3      //存储数量
#define SEARCH_HISTORY [[NSUserDefaults standardUserDefaults] arrayForKey:@"SearchHistory"]
@implementation YPSearchTool
+ (void)addSearchRecord:(NSString *)searchStr
{
    NSMutableArray *searchArray = [[NSMutableArray alloc]initWithArray:SEARCH_HISTORY];
    if (searchArray == nil) {
        searchArray = [[NSMutableArray alloc]init];
    } else if ([searchArray containsObject:searchStr]) {
        [searchArray removeObject:searchStr];
    } else if ([searchArray count] >= RecordCount) {
        [searchArray removeObjectsInRange:NSMakeRange(RecordCount - 1, [searchArray count] - RecordCount + 1)];
    }
    [searchArray insertObject:searchStr atIndex:0];
    [[NSUserDefaults standardUserDefaults] setObject:searchArray forKey:@"SearchHistory"];
}

+ (NSArray *)getAllSearchHistory
{
    return SEARCH_HISTORY;
}

+ (void)clearAllSearchHistory
{
    [[NSUserDefaults standardUserDefaults] setObject:[[NSMutableArray alloc]init] forKey:@"SearchHistory"];
}
@end