NSMutableArray *stockHoldingCompanies = [NSMutableArray arrayWithObjects:fortune1stock,fortune2stock,fortune3stock,fortune4stock,fortune5stock,fortune6stock , nil];

NSSortDescriptor *sortOrder = [NSSortDescriptor sortDescriptorWithKey:@"companyName" ascending:NO];

[stockHoldingCompanies sortUsingDescriptors:[NSArray arrayWithObject:sortOrder]];

NSEnumerator *enumerator = [stockHoldingCompanies objectEnumerator];

ForeignStockHolding *stockHoldingCompany;

NSLog(@"Fortune 6 companies sorted by Company Name");

    while (stockHoldingCompany = [enumerator nextObject]) {
        NSLog(@"===============================");
        NSLog(@"CompanyName:%@",stockHoldingCompany.companyName);
        NSLog(@"Purchase Share Price:%.2f",stockHoldingCompany.purchaseSharePrice);
        NSLog(@"Current Share Price: %.2f",stockHoldingCompany.currentSharePrice);
        NSLog(@"Number of Shares: %i",stockHoldingCompany.numberOfShares);
        NSLog(@"Cost in Dollars: %.2f",[stockHoldingCompany costInDollars]);
        NSLog(@"Value in Dollars : %.2f",[stockHoldingCompany valueInDollars]);
    }
    NSLog(@"===============================");

我什么都试过了，但这个对我有用。在一个类中，我有另一个名为“crimeScene”的类，并希望通过“crimeScene”的属性进行排序。

这就像一个魅力:

NSSortDescriptor *sorter = [[NSSortDescriptor alloc] initWithKey:@"crimeScene.distance" ascending:YES];
[self.arrAnnotations sortUsingDescriptors:[NSArray arrayWithObject:sorter]];

NSMutableArray *stockHoldingCompanies = [NSMutableArray arrayWithObjects:fortune1stock,fortune2stock,fortune3stock,fortune4stock,fortune5stock,fortune6stock , nil];

NSSortDescriptor *sortOrder = [NSSortDescriptor sortDescriptorWithKey:@"companyName" ascending:NO];

[stockHoldingCompanies sortUsingDescriptors:[NSArray arrayWithObject:sortOrder]];

NSEnumerator *enumerator = [stockHoldingCompanies objectEnumerator];

ForeignStockHolding *stockHoldingCompany;

NSLog(@"Fortune 6 companies sorted by Company Name");

    while (stockHoldingCompany = [enumerator nextObject]) {
        NSLog(@"===============================");
        NSLog(@"CompanyName:%@",stockHoldingCompany.companyName);
        NSLog(@"Purchase Share Price:%.2f",stockHoldingCompany.purchaseSharePrice);
        NSLog(@"Current Share Price: %.2f",stockHoldingCompany.currentSharePrice);
        NSLog(@"Number of Shares: %i",stockHoldingCompany.numberOfShares);
        NSLog(@"Cost in Dollars: %.2f",[stockHoldingCompany costInDollars]);
        NSLog(@"Value in Dollars : %.2f",[stockHoldingCompany valueInDollars]);
    }
    NSLog(@"===============================");

使用NSComparator进行排序

如果我们想对自定义对象进行排序，我们需要提供NSComparator，它用于比较自定义对象。该块返回一个NSComparisonResult值来表示两个对象的排序。为了对整个数组进行排序，NSComparator的用法如下。

NSArray *sortedArray = [employeesArray sortedArrayUsingComparator:^NSComparisonResult(Employee *e1, Employee *e2){
    return [e1.firstname compare:e2.firstname];    
}];

使用NSSortDescriptor进行排序 让我们假设，作为一个例子，我们有一个包含自定义类实例的数组，Employee具有属性firstname, lastname和age。下面的例子说明了如何创建一个NSSortDescriptor，该NSSortDescriptor可用于按年龄键升序对数组内容进行排序。

NSSortDescriptor *ageDescriptor = [[NSSortDescriptor alloc] initWithKey:@"age" ascending:YES];
NSArray *sortDescriptors = @[ageDescriptor];
NSArray *sortedArray = [employeesArray sortedArrayUsingDescriptors:sortDescriptors];

使用自定义比较进行排序 名称是字符串，当您对字符串进行排序以呈现给用户时，您应该始终使用本地化比较。通常您还希望执行不区分大小写的比较。下面是一个示例，使用(localizedStandardCompare:)按姓氏和名字对数组进行排序。

NSSortDescriptor *lastNameDescriptor = [[NSSortDescriptor alloc]
              initWithKey:@"lastName" ascending:YES selector:@selector(localizedStandardCompare:)];
NSSortDescriptor * firstNameDescriptor = [[NSSortDescriptor alloc]
              initWithKey:@"firstName" ascending:YES selector:@selector(localizedStandardCompare:)];
NSArray *sortDescriptors = @[lastNameDescriptor, firstNameDescriptor];
NSArray *sortedArray = [employeesArray sortedArrayUsingDescriptors:sortDescriptors];

如需参考及详细讨论，请参考: https://developer.apple.com/library/ios/documentation/Cocoa/Conceptual/SortDescriptors/Articles/Creating.html http://www.ios-blog.co.uk/tutorials/objective-c/how-to-sort-nsarray-with-custom-objects/

比较的方法

你可以为你的对象实现一个比较方法:

- (NSComparisonResult)compare:(Person *)otherObject {
    return [self.birthDate compare:otherObject.birthDate];
}

NSArray *sortedArray = [drinkDetails sortedArrayUsingSelector:@selector(compare:)];

NSSortDescriptor (better)

或者通常更好:

NSSortDescriptor *sortDescriptor;
sortDescriptor = [[NSSortDescriptor alloc] initWithKey:@"birthDate"
                                           ascending:YES];
NSArray *sortedArray = [drinkDetails sortedArrayUsingDescriptors:@[sortDescriptor]];

通过向数组中添加多个键，可以轻松地按多个键排序。也可以使用自定义比较器方法。看一下文档。

块(闪亮的!)

从Mac OS X 10.6和iOS 4开始，也有可能用块排序:

NSArray *sortedArray;
sortedArray = [drinkDetails sortedArrayUsingComparator:^NSComparisonResult(Person *a, Person *b) {
    return [a.birthDate compare:b.birthDate];
}];

性能

一般来说，基于块的方法比使用NSSortDescriptor要快得多，因为后者依赖于KVC。NSSortDescriptor方法的主要优点是它提供了一种使用数据而不是代码来定义排序顺序的方法，这使得它很容易，例如，用户可以通过单击标题行来对NSTableView进行排序。

我只是根据自定义需求做了多级排序。

//对值排序

    [arrItem sortUsingComparator:^NSComparisonResult (id a, id b){

    ItemDetail * itemA = (ItemDetail*)a;
    ItemDetail* itemB =(ItemDetail*)b;

    //item price are same
    if (itemA.m_price.m_selling== itemB.m_price.m_selling) {

        NSComparisonResult result=  [itemA.m_itemName compare:itemB.m_itemName];

        //if item names are same, then monogramminginfo has to come before the non monograme item
        if (result==NSOrderedSame) {

            if (itemA.m_monogrammingInfo) {
                return NSOrderedAscending;
            }else{
                return NSOrderedDescending;
            }
        }
        return result;
    }

    //asscending order
    return itemA.m_price.m_selling > itemB.m_price.m_selling;
}];

https://sites.google.com/site/greateindiaclub/mobil-apps/ios/multilevelsortinginiosobjectivec