数组过滤去掉相同元素

#import <Foundation/Foundation.h>

@interface NSMutableArray (FilterElement)

/**

 *   过滤掉相同的元素

 *

 *   @return 返回一个数组

 */

- (NSMutableArray*)filterTheSameElement;

@end

#import "NSMutableArray+FilterElement.h"

@implementation NSMutableArray (FilterElement)

/**

 *   过滤掉相同的元素

 *

 *   @return 返回一个数组

 */

- (NSMutableArray*)filterTheSameElement

{

    NSMutableSet *set = [NSMutableSet set];

    for (NSObject *obj in self) {

        [set addObject:obj];

    }

    [self removeAllObjects];

    for (NSObject *obj in set) {

        [self addObject:obj];

    }

    return self;

}

@end