ios海哥开发笔记 （海哥原创，iOS 之iOS 之NSIndexPath ）

是Foundation框架中的一个普通的类，它提供了到嵌套数列的树中特定节点的路径，事实上，它是一个整数阵列，表格视图使用这个去表现在特定章节中的特定行，UITableView用的所有索引路径正好有两个元素，第一个是章节，第二个是行。NSIndexPath和TableViews@interfaceNSIndexPath
(UITableView) {}+(NSIndexPath*)indexPathForRow:(NSUInteger)row
inSection:(NSUInteger)section;@property(nonatomic,readonly)NSUIntegerrow;@property(nonatomic,readonly)NSUIntegersection;@end

NSIndexPath是一種特別的資料類別，這是用來表示一個路徑，這個路徑是指到一個從0開始的巢狀集合陣列樹狀結構的某個節點。iPhone OS為UITableView擴充了這個類別（見NSIndexPath
UIKit Additions這是用分類擴充），加入了一個用來建立新的NSIndexPath實體的「(NSIndexPath *)indexPathForRow:(NSUInteger)row inSection:(NSUInteger)section」方法和row和section兩個屬性。原帖：http://blog.163.com/hw707@126/blog/static/68486388201011255624582/原博文：/article/10909398.htmlnsindexpath的compare方法：compare:Indicates the depth-first
traversal order of the receiving index path and another index path.- (NSComparisonResult)compare:(NSIndexPath
*)indexPath
ParametersindexPathIndex path to compare.This value must not be

nil

. If the value is

nil

,
the behavior is undefined.
Return ValueThe depth-first traversal ordering of the receiving index path and indexPath.

NSOrderedAscending

:
The receiving index path comes before indexPath.

NSOrderedDescending

:
The receiving index path comes after indexPath.

NSOrderedSame

:
The receiving index path and indexPath are the same index path.
AvailabilityAvailable in Mac OS X v10.4 and later.
Declared In

NSIndexPath.h