iphone - 在 objective-c 中对负数和正数进行排序

Question

我通过网络服务列出了一个项目的数量百分比。我得到的响应是一个类似于下面代码的字典数组。我需要它的排序格式

NSArray *numberArray = [NSArray arrayWithObjects:
    [NSDictionary dictionaryWithObjectsAndKeys:[NSNumber numberWithFloat:-12.0], @"price", nil],
    [NSDictionary dictionaryWithObjectsAndKeys:[NSNumber numberWithFloat:-86.0],@"price", nil],
    [NSDictionary dictionaryWithObjectsAndKeys:[NSNumber numberWithFloat:-8.0],@"price", nil],
    [NSDictionary dictionaryWithObjectsAndKeys:[NSNumber numberWithFloat:12.0],@"price", nil],
    [NSDictionary dictionaryWithObjectsAndKeys:[NSNumber numberWithFloat:2.0],@"price", nil],
    [NSDictionary dictionaryWithObjectsAndKeys:[NSNumber numberWithFloat:112.0],@"price", nil], nil];

这是 JSON 响应的日志

[
    {
        price = "-12";
    },
        {
        price = "-86";
    },
        {
        price = "-8";
    },
        {
        price = 12;
    },
        {
        price = 2;
    },
        {
        price = 112;
    }
]

Answer 1

NSArray *sortedResult = [numberArray sortedArrayUsingComparator:^NSComparisonResult(id obj1, id obj2) {
    NSNumber *num1 = [obj1 objectForKey:@"price"];
    NSNumber *num2 = [obj2 objectForKey:@"price"];
    return [num1 compare:num2];
}];
NSLog(@"---%@",sortedResult);

如果您希望 sortedResult 以降序排列，则交换 num1 和 num2 在
返回声明。