问题描述

根据关键字的价格排序

关键字排序问题：

每个dictionary对象有不同的数据类型，全部dictionary都当做string提取了，怎么样将这些string类型的数据转换为不同类型，然后根据价格排序。

-(IBAction)PriceSort:(id)sender{    NSSortDescriptor * sort = [[NSSortDescriptor alloc] initWithKey:@""Price"" ascending:true] ;    NSArray *sa = [symbolArray sortedArrayUsingDescriptors:[NSArray arrayWithObject:sort]];    NSLog(@""price=%@""sa);}

输出：

{    volume = 2496752;    Yield = ""10.49"";    MarCap = 829;    Price = ""0.715"";    Symbol = SAIPI;}

解决方案

sortDescriptor = [[NSSortDescriptor alloc] initWithKey:@""price""                                                 ascending:YES selector:@selector(localizedStandardCompare:)] ;

#*#

-(void)sort{    //This is the array of dictionaries where each dictionary holds a record    NSMutableArray * array;     //allocate the memory to the mutable array and add the records to the arrat    // I have used simple bubble sort you can use any other algorithm that suites you    //bubble sort    //    for(int i = 0; i < [array count]; i++)    {        for(int j = i+1; j < [array count]; j++)        {            NSDictionary *recordOne = [array objectAtIndex:i];            NSDictionary *recordTwo = [array objectAtIndex:j];            if([[recordOne valueForKey:@""price""] floatValue] > [[recordTwo valueForKey:@""remaining""] floatValue])            {                [array exchangeObjectAtIndex:i withObjectAtIndex:j];            }        }       }    //Here you get the sorted array}