iOSはUserDefaultsを利用して、共通の検索ページ記録ツールを迅速に実現

1.需要分析

2.実現

//  RPCustomTool.h
//  RollingPin
//
//  Created by RollingPin on 2020/12/31.
//  Copyright © 2020 RollingPin. All rights reserved.
//
#import 
#import 
@interface RPCustomTool : NSObject
///  
+ (void)saveHistoryString:(NSString *)saveStr;
///  
+ (NSArray *)readHistoryList;
///  
+ (void)deleteHistoryList;
@end

//  RPCustomTool.h
//  RollingPin
//
//  Created by RollingPin on 2020/12/31.
//  Copyright © 2020 RollingPin. All rights reserved.
//
#import "RPCustomTool.h"
@implementation RPCustomTool

#pragma mark -  
+ (void)saveHistoryString:(NSString *)saveStr
{
     
    NSUserDefaults *userDefaults = [NSUserDefaults standardUserDefaults];
    NSArray *savedArray = [userDefaults arrayForKey:@"RPSearchHistoryMark"];
    NSMutableArray *savedMuArray = [[NSMutableArray alloc]initWithArray:savedArray];
    // 
    NSString *repetitiveStr = @"";
    for (NSString * oneStr in savedArray) {
     
        if ([oneStr isEqualToString:saveStr]) {
     
            repetitiveStr = oneStr;
            break;
        }
    }
    if (repetitiveStr.length >0) {
     
        [savedMuArray removeObject:repetitiveStr];
    }
    [savedMuArray addObject:saveStr];
    // 
    if(savedMuArray.count > 10)
    {
     
        [savedMuArray removeObjectAtIndex:0];
    }
    // NSUserDefaults 
    [userDefaults setObject:savedMuArray forKey:@"RPSearchHistoryMark"];
    [userDefaults synchronize];
}
#pragma mark -  
+ (NSArray *)readHistoryList
{
     
    NSUserDefaults *userDefaults = [NSUserDefaults standardUserDefaults];
    // NSArray 
    NSArray *savedArray = [userDefaults arrayForKey:@"RPSearchHistoryMark"];
    NSLog(@"savedArray======%@",savedArray);
    return [savedArray copy];
}
#pragma mark -  
+ (void)deleteHistoryList
{
     
    NSUserDefaults *userDefaults = [NSUserDefaults standardUserDefaults];
    [userDefaults setObject:[NSArray array] forKey:@"RPSearchHistoryMark"];
    [userDefaults synchronize];
}
@end