NSArray 使用NSSortDescriptor 对两个key排序

1. 使用一个key 排序

NSMutableArray *tempArr = [NSMutableArray array];
    numMode *num1 = [[numMode alloc] init];
    // num1.dict = @{@"key1" : @"123"} ;
    [tempArr addObject:num1];
    
    numMode *num2 = [[numMode alloc] init];
    num2.firstNum = 3;
    num2.dict = @{@"key1" : @"122"} ;

    [tempArr addObject:num2];
    
    numMode *num3 = [[numMode alloc] init];
    num3.firstNum = 17;
    num3.dict = @{@"key1" : @"128"} ;
    [tempArr addObject:num3];
    
    numMode *num4 = [[numMode alloc] init];
    num4.dict = @{@"key1" : @"0"} ;
    num4.firstNum = 9;
    [tempArr addObject:num4];
    
    // NSMutableArray *arr =[NSMutableArray arrayWithArray:@[@(1), @(8),@(2),@(19),@(3),@(4),@(5)]];
    NSMutableArray *arr = tempArr;
    
    NSSortDescriptor *firstSorter = [[NSSortDescriptor alloc] initWithKey:@"firstNum" ascending:YES];
    NSSortDescriptor *secondSorter = [[NSSortDescriptor alloc] initWithKey:@"dict" ascending:YES comparator:^NSComparisonResult(id  _Nonnull obj1, id  _Nonnull obj2) {
        
        NSDictionary *dict1 = obj1;
        NSDictionary *dict2 = obj2;
        if ([dict1[@"key1"] doubleValue] < [dict2[@"key1"] doubleValue]) {
            return NSOrderedDescending;
        }
        if ([dict1[@"key1"] doubleValue] > [dict2[@"key1"] doubleValue]) {
            return NSOrderedAscending;
        }
        return NSOrderedSame;
    }];
    
    [arr sortUsingDescriptors:[NSArray arrayWithObjects: secondSorter,nil]];
    for (int i=0; i

2. 使用两个及更多key排序

NSMutableArray *tempArr = [NSMutableArray array];
    numMode *num1 = [[numMode alloc] init];
    // num1.dict = @{@"key1" : @"123"} ;
    [tempArr addObject:num1];
    
    numMode *num2 = [[numMode alloc] init];
    num2.firstNum = 3;
    num2.dict = @{@"key1" : @"122"} ;

    [tempArr addObject:num2];
    
    numMode *num3 = [[numMode alloc] init];
    num3.firstNum = 17;
    num3.dict = @{@"key1" : @"128"} ;
    [tempArr addObject:num3];
    
    numMode *num4 = [[numMode alloc] init];
    num4.dict = @{@"key1" : @"0"} ;
    num4.firstNum = 9;
    [tempArr addObject:num4];
    
    // NSMutableArray *arr =[NSMutableArray arrayWithArray:@[@(1), @(8),@(2),@(19),@(3),@(4),@(5)]];
    NSMutableArray *arr = tempArr;
    
    NSSortDescriptor *firstSorter = [[NSSortDescriptor alloc] initWithKey:@"firstNum" ascending:YES];
    NSSortDescriptor *secondSorter = [[NSSortDescriptor alloc] initWithKey:@"dict" ascending:YES comparator:^NSComparisonResult(id  _Nonnull obj1, id  _Nonnull obj2) {
        
        NSDictionary *dict1 = obj1;
        NSDictionary *dict2 = obj2;
        if ([dict1[@"key1"] doubleValue] < [dict2[@"key1"] doubleValue]) {
            return NSOrderedDescending;
        }
        if ([dict1[@"key1"] doubleValue] > [dict2[@"key1"] doubleValue]) {
            return NSOrderedAscending;
        }
        return NSOrderedSame;
    }];
    
    [arr sortUsingDescriptors:[NSArray arrayWithObjects: secondSorter,nil]];
    for (int i=0; i