对于数组中的某个对象进行排序

NSMutableArray *myMutableArr = [[[NSMutableArray alloc] init] autorelease];
NSDictionary *dicOne = [NSDictionary dictionaryWithObjectsAndKeys:@"1",@"price",@"2",@"number", nil];
NSDictionary *dicTWo = [NSDictionary dictionaryWithObjectsAndKeys:@"6",@"price",@"5",@"number", nil];
NSDictionary *dicThree = [NSDictionary dictionaryWithObjectsAndKeys:@"3",@"price",@"1",@"number", nil];
NSDictionary *dicFour = [NSDictionary dictionaryWithObjectsAndKeys:@"4",@"price",@"3",@"number", nil];
[myMutableArr addObject:dicOne];
[myMutableArr addObject:dicTWo];
[myMutableArr addObject:dicThree];
[myMutableArr addObject:dicFour];

NSArray *sortDescriptors = [NSArray arrayWithObject:[NSSortDescriptor sortDescriptorWithKey:@"price" ascending:YES]];
[myMutableArr sortUsingDescriptors:sortDescriptors];
NSLog(@"排序后的数组%@",myMutableArr);

- (NSArray *)compareWithArray:(NSArray *)array Key:(nullable NSString *)key{
    NSMutableArray *compareArray = [NSMutableArray arrayWithArray:array];
    NSSortDescriptor *sortDes = [NSSortDescriptor sortDescriptorWithKey:key ascending:false];//ascending:YES 代表升序 如果为NO 代表降序
    return [compareArray sortedArrayUsingDescriptors:@[sortDes]];
}