删除重复的nsarray [英] removing duplicates in nsarray

问题描述

如何删除nsarray中的重复项。例如我的数组包含以下数据。我想与相邻的日期进行比较，以避免重复，但是通过错误。

任何人都可以指导我我将遇到什么错误

日历首先 -

 （
 2010-09-25 17:00:00 GMT，
AAA，
 2010-09-25 17:00:00 GMT，
AAA，
 2010-09-26 17:00:00 GMT，
 BBB，
 2010-09-26 17:00:00 GMT，
BBB，
 2010-09-27 17:00:00 GMT，
CCCC ，
 2010-09-27 17:00:00 GMT，
CCC，
 2010-09-28 17:00:00 GMT，
AAA 
 2010-09-28 17:00:00 GMT，
AAA，
 2010-09-29 17:00:00 GMT，
DDDD，
 2010-09-29 17:00:00 GMT，
DDDD，
 2010-09-30 17:00:00 GMT，
BBBB
） 
  

我的代码

 code> NSArray日期; // date包含上述值
 NSMutableArray * temp_date = [[NSMutableArray alloc] init]; （int i = 0; i< [dates count]; i + = 2）
 
 {
 BOOL day; 
 
 if（[dates count] -2&i）{
 day = [[dates objectAtIndex：i] compare：[dates objectAtIndex：i + 2]]; 
} 
 
 if（day）{
 [temp_date addObject：[dates objectAtIndex：i]]; 
 [temp_date addObject：[dates objectAtIndex：i + 1]]; 
} 
} 
  

问候，
sathish

解决方案

你可以使用集合。复制将在创建时自动删除。

  NSArray * cleaningArray = [[NSSet setWithArray：dates] allObjects]; 
  

请记住一套无序。

 根据布伦特的评论，最新的问题解决方案可以让您保持元素的顺序。 [[NSOrderedSet orderedSetWithArray：dates]数组] 
  

how can i remove duplicates in nsarray. for instance my array contains following data. I want to compare with adjacent dates to avoid duplicates but it throughs error.

Can anyone guide me what i am going wrong

calendar first-

( 
2010-09-25 17:00:00 GMT,
"AAA",
2010-09-25 17:00:00 GMT,
"AAA",
2010-09-26 17:00:00 GMT,
"BBB",
2010-09-26 17:00:00 GMT,
"BBB",
2010-09-27 17:00:00 GMT,
"CCCC",
2010-09-27 17:00:00 GMT,
"CCC",
2010-09-28 17:00:00 GMT,
"AAA",
2010-09-28 17:00:00 GMT,
"AAA",
2010-09-29 17:00:00 GMT,
"DDDD",
2010-09-29 17:00:00 GMT,
"DDDD",
2010-09-30 17:00:00 GMT,
"BBBB"
)

my code

NSArray dates; //dates contain above values
NSMutableArray *temp_date = [[NSMutableArray alloc] init];

for (int i=0; i<[dates count]; i+=2){
    BOOL day;

    if ([dates count]-2 >i) {
        day = [[dates objectAtIndex:i] compare:[dates objectAtIndex:i+2]];
    }   

    if (day) {
        [temp_date addObject:[dates objectAtIndex:i]];
        [temp_date addObject:[dates objectAtIndex:i+1] ];
    }
}

Regards, sathish

解决方案

You could use sets. Duplicates will be removed automatically upon creation.

NSArray *cleanedArray = [[NSSet setWithArray:dates] allObjects];

Bear in mind that a set is unordered.

As per Brent's comment, a more recent solution to the problem that will allow you to keep the elements in order.

[[NSOrderedSet orderedSetWithArray:dates] array]

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