iOS去除数组中重复数据的几种方法

2019独角兽企业重金招聘Python工程师标准>>>

利用NSDictionary的AllKeys（AllValues）方法

    NSArray *dataArray = @[@"2014-04-01",@"2014-04-02",@"2014-04-03",  
                           @"2014-04-01",@"2014-04-02",@"2014-04-03",  
                           @"2014-04-01",@"2014-04-03",@"2014-04-03",  
                           @"2014-04-01",@"2014-04-02",@"2014-04-03",  
                           @"2014-04-01",@"2014-04-02",@"2014-04-03",  
                           @"2014-04-01",@"2014-04-02",@"2014-04-03",  
                           @"2014-04-04",@"2014-04-06",@"2014-04-08",  
                           @"2014-04-05",@"2014-04-07",@"2014-04-09",];  
    NSMutableDictionary *dic = [[NSMutableDictionary alloc]initWithCapacity:0];  
    for(NSString *str in dataArray)  
    {  
        [dic setValue:str forKey:str];  
    }  
    NSLog(@"%@",[dic allKeys]); 

利用NSSet的AllObjects方法

   NSArray *dataArray = @[@"2014-04-01",@"2014-04-02",@"2014-04-03",  
                          @"2014-04-01",@"2014-04-02",@"2014-04-03",  
                          @"2014-04-01",@"2014-04-03",@"2014-04-03",  
                          @"2014-04-01",@"2014-04-02",@"2014-04-03",  
                          @"2014-04-01",@"2014-04-02",@"2014-04-03",  
                          @"2014-04-01",@"2014-04-02",@"2014-04-03",  
                          @"2014-04-04",@"2014-04-06",@"2014-04-08",  
                          @"2014-04-05",@"2014-04-07",@"2014-04-09",];  
   NSSet *set = [NSSet setWithArray:dataArray];  
   NSLog(@"%@",[set allObjects]);  

 利用数组的containsObject来去除

    NSArray *dataArray = @[@"2014-04-01",@"2014-04-02",@"2014-04-03",  
                           @"2014-04-01",@"2014-04-02",@"2014-04-03",  
                           @"2014-04-01",@"2014-04-03",@"2014-04-03",  
                           @"2014-04-01",@"2014-04-02",@"2014-04-03",  
                           @"2014-04-01",@"2014-04-02",@"2014-04-03",  
                           @"2014-04-01",@"2014-04-02",@"2014-04-03",  
                           @"2014-04-04",@"2014-04-06",@"2014-04-08",  
                           @"2014-04-05",@"2014-04-07",@"2014-04-09",];  
    NSMutableArray *listAry = [[NSMutableArray alloc]init];  
    for (NSString *str in dataArray) {  
        if (![listAry containsObject:str]) {  
            [listAry addObject:str];  
        }  
    }  
    NSLog(@"%@",listAry);  

利用keyValue的方式

NSArray *dataArray = @[@"2014-04-01",@"2014-04-02",@"2014-04-03",  
                       @"2014-04-01",@"2014-04-02",@"2014-04-03",  
                       @"2014-04-01",@"2014-04-03",@"2014-04-03",  
                       @"2014-04-01",@"2014-04-02",@"2014-04-03",  
                       @"2014-04-01",@"2014-04-02",@"2014-04-03",  
                       @"2014-04-01",@"2014-04-02",@"2014-04-03",  
                       @"2014-04-04",@"2014-04-06",@"2014-04-08",  
                       @"2014-04-05",@"2014-04-07",@"2014-04-09",];  
dataArray = [dataArray valueForKeyPath:@"@distinctUnionOfObjects.self"];  
NSLog(@"%@",dataArray); 

 

转载于:https://my.oschina.net/gwlCode/blog/1358868