如何使用数字按字母顺序对NSArray进行排序

Question

我有一个小疑问,就是我有一个包含以下4个对象的NSArray:

Genesis, 1 Kings, leviticus, 2 Kings

我想按字典顺序对这个数组进行排序,就像我想要这样的预期输出

1 Kings, 2 Kings, Genesis, leviticus

怎么能实现这一目标？

Answer 1

转到此链接:

http://developer.apple.com/library/mac/#documentation/Cocoa/Conceptual/Collections/Articles/Arrays.html#//apple_ref/doc/uid/20000132-SW5

这是Apple文档,您的问题在那里得到解决.

看看这个例子.

//First create the array of dictionaries
NSString *last = @"lastName";
NSString *first = @"firstName";

NSMutableArray *array = [NSMutableArray array];
NSArray *sortedArray;

NSDictionary *dict;
dict = [NSDictionary dictionaryWithObjectsAndKeys:
                 @"Jo", first, @"Smith", last, nil];
[array addObject:dict];

dict = [NSDictionary dictionaryWithObjectsAndKeys:
                 @"Joe", first, @"Smith", last, nil];
[array addObject:dict];

dict = [NSDictionary dictionaryWithObjectsAndKeys:
                 @"Joe", first, @"Smythe", last, nil];
[array addObject:dict];

dict = [NSDictionary dictionaryWithObjectsAndKeys:
                 @"Joanne", first, @"Smith", last, nil];
[array addObject:dict];

dict = [NSDictionary dictionaryWithObjectsAndKeys:
                 @"Robert", first, @"Jones", last, nil];
[array addObject:dict];

//Next we sort the contents of the array by last name then first name

// The results are likely to be shown to a user
// Note the use of the localizedCaseInsensitiveCompare: selector
NSSortDescriptor *lastDescriptor =[[NSSortDescriptor alloc] initWithKey:last
                           ascending:YES
                           selector:@selector(localizedCaseInsensitiveCompare:)];
NSSortDescriptor *firstDescriptor =
[[NSSortDescriptor alloc] initWithKey:first
                           ascending:YES
                           selector:@selector(localizedCaseInsensitiveCompare:)];

NSArray *descriptors = [NSArray arrayWithObjects:lastDescriptor, firstDescriptor, nil];
sortedArray = [array sortedArrayUsingDescriptors:descriptors];

此代码是Apple文档中的一个示例.

我希望它能帮到你.

谢谢,

Hemang.

Answer 2

您可以NSString按字母顺序对数组进行排序,如下所示:

NSArray *sortedArray = [myArray sortedArrayUsingSelector:@selector(caseInsensitiveCompare:)];