如何排序NSPredicate [英] How to sort NSPredicate

问题描述

我想使用NSPredicate排序我的数组..我已经阅读其他地方可能使用NSSortDescriptor可能是一个选项。

我试图按公司名称对数组进行排序。

，感谢

Greg

   - （void）filterSummaries：（NSMutableArray *）all byNameThenBooth：（NSString *）text results：（NSMutableArray *）results 
 {
 [results removeAllObjects]; 
 
 if（（nil！= text）&&（0< [text length]））{
 if（（all！= nil）&& ; [all count]））{
 NSPredicate * predicate = [NSPredicate predicateWithFormat：@companyName contains [cd]％@ OR boothNumber beginswith％@，text，text]; 
 [results addObjectsFromArray：[all filteredArrayUsingPredicate：predicate]]; 
} 
} 
 else {
 [results addObjectsFromArray：all]; 
} 
} 
  

解决方案有几个选项如何对数组排序：

我会在这里显示一个基于NSSortDescriptor的方法。

  NSPredicate * predicate = [NSPredicate predicateWithFormat：
 @companyName contains [cd]％@ OR boothNumber startedwith％@，
 text，
 text]; 
 
 //注释掉旧的起点:) 
 // [results addObjectsFromArray：[all filteredArrayUsingPredicate：predicate]]; 
 
 //创建描述符
 //这里假设结果是Key-Value-accessible 
 NSSortDescriptor * descriptor = [NSSortDescriptor sortDescriptorWithKey：@companyName
 ascending：YES]; 
 // 
 NSArray * results = [[all filteredArrayUsingPredicate：predicate] 
 sortedArrayUsingDescriptors：[NSArray arrayWithObject：descriptor]]; 
 
 //结果var指向一个NSArray对象，其内容按公司名称键升序排列。
  

这应该做你的工作。

I am trying to sort my array while using NSPredicate.. I have read other places that possibly using NSSortDescriptor could be an option. Having some trouble figuring this out.

I am attempting to sort my array by companyName.

Any advice appreciated, thanks

Greg

- (void)filterSummaries:(NSMutableArray *)all byNameThenBooth:(NSString*) text results:(NSMutableArray *)results
{
    [results removeAllObjects];

    if ((nil != text) && (0 < [text length])) {        
        if ((all != nil) && (0 < [all count])) {
            NSPredicate *predicate = [NSPredicate predicateWithFormat: @"companyName contains[cd] %@ OR boothNumber beginswith %@", text, text];
            [results addObjectsFromArray:[all filteredArrayUsingPredicate:predicate]];        
        }
    }
    else {
        [results addObjectsFromArray:all];
    }
}

解决方案

you have several options how to sort an array:

I'll show a NSSortDescriptor-based approach here.

NSPredicate *predicate = [NSPredicate predicateWithFormat:
                                  @"companyName contains[cd] %@ OR boothNumber beginswith %@",
                                  text,
                                  text];

// commented out old starting point :)
//[results addObjectsFromArray:[all filteredArrayUsingPredicate:predicate]];

// create a descriptor
// this assumes that the results are Key-Value-accessible
NSSortDescriptor *descriptor = [NSSortDescriptor sortDescriptorWithKey:@"companyName" 
                                                             ascending:YES];
//
NSArray *results = [[all filteredArrayUsingPredicate:predicate]  
                     sortedArrayUsingDescriptors:[NSArray arrayWithObject:descriptor]];

// the results var points to a NSArray object which contents are sorted ascending by companyName key

This should do your job.

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