OC 学习笔记 - NSArray Category

NSArray+ZJTool.h

#import <Foundation/Foundation.h>
@interface NSArray (ZJTool)
#pragma mark - 排序
//重组集合(打乱顺序)
- (NSArray *)shuffledArray;
//集合倒序
- (NSArray *)reversedArray;
//集合去重
- (NSArray *)uniqueArray;
//升降序排列 YES 升序 NO 降序
@end
- (NSArray *)arraySorting:(NSString *)parameters  ascending:(BOOL)ascending;

NSArray+ZJTool.m

#import "NSArray+ZJTool.h"
@implementation NSArray (ZJTool)
#pragma mark - 排序
- (NSArray *)shuffledArray {
    NSMutableArray *array = [NSMutableArray arrayWithCapacity:[self count]];
    NSMutableArray *copy = [self mutableCopy];
    while ([copy count] > 0)
    {
        int index = arc4random() % [copy count];
        id objectToMove = [copy objectAtIndex:index];
        [array addObject:objectToMove];
        [copy removeObjectAtIndex:index];
    }
    return array;
}
- (NSArray *)reversedArray {
    NSArray *reversedArray = [[self reverseObjectEnumerator] allObjects];
    return reversedArray;
}
- (NSArray *)uniqueArray {
    NSSet *set = [NSSet setWithArray:self];
    NSArray *array = [[NSArray alloc] initWithArray:[set allObjects]];
    return array;
}
- (NSArray *)arraySorting:(NSString *)parameters  ascending:(BOOL)ascending {
    NSSortDescriptor*sorter=[[NSSortDescriptor alloc]initWithKey:parameters ascending:ascending];
    NSMutableArray *sortDescriptors=[[NSMutableArray alloc]initWithObjects:&sorter count:1];
    NSArray *sortArray=[self sortedArrayUsingDescriptors:sortDescriptors];
    return sortArray;
}
@end