昂首千丘遠，嘯傲風(fēng)間，堪尋敵手共論劍，高處不勝寒。

——風(fēng)之痕

NSIndexPath

索引列表，它們一起表示嵌套數(shù)組樹中特定位置的路徑。

創(chuàng)建索引路徑

//創(chuàng)建空索引
NSIndexPath *indexPath = [[NSIndexPath alloc]init];//輸出：{length = 0, path = }
 
//創(chuàng)建單節(jié)點索引路徑
NSIndexPath *indexPath1 = [NSIndexPath indexPathWithIndex:1];//輸出：{length = 1, path = 1}
 
//創(chuàng)建具有一個或多個節(jié)點的索引路徑。
NSUInteger indexs[] = {1,2,3,4,5};
NSIndexPath *indexPath2 = [NSIndexPath indexPathWithIndexes:indexs length:5];//輸出：{length = 5, path = 1 - 2 - 3 - 4 - 5}

更改索引路徑

//索引添加新節(jié)點，返回新的索引
NSIndexPath *indexPath3 = [indexPath1 indexPathByAddingIndex:2];//輸出：{length = 2, path = 1 - 2}
 
//移除索引尾部節(jié)點，返回新的索引
NSIndexPath *indexPath4 = [indexPath2 indexPathByRemovingLastIndex];//輸出：{length = 4, path = 1 - 2 - 3 - 4}

//將索引路徑中存儲的索引從位置范圍指定的位置復(fù)制到指定的索引中
[indexPath2 getIndexes:indexs range:NSMakeRange(0, indexPath2.length-2)];//輸出：{length = 5, path = 1 - 2 - 3 - 4 - 5}

訪問索引路徑值

//返回索引指定節(jié)點的值
NSUInteger index = [indexPath2 indexAtPosition:1];//輸出：2
 
//返回索引路徑中的節(jié)點數(shù)
NSUInteger count = indexPath2.length;//輸出：5

比較索引

//比較索引
/*
  typedef NS_CLOSED_ENUM(NSInteger, NSComparisonResult) {
      NSOrderedAscending = -1L,升序
      NSOrderedSame,相等
      NSOrderedDescending 降序
  };
*/
NSComparisonResult result = [indexPath1 compare:indexPath2];//輸出：NSOrderedAscending

NSIndexPath (UIKitAdditions)

UIKIt框架下的索引方法，針對于UITableView與UICollectionView

UITableView-索引路徑創(chuàng)建與訪問

NSIndexPath *indexPath = [NSIndexPath indexPathForRow:0 inSection:0];//輸出：{length = 2, path = 0 - 0}
NSInteger section = indexPath.section;//0
NSInteger row = indexPath.row;//0

UICollectionView-索引路徑創(chuàng)建與訪問

NSIndexPath *indexPath1 = [NSIndexPath indexPathForItem:0 inSection:0];//輸出：{length = 2, path = 0 - 0}
NSInteger item = indexPath1.item;//0

歡迎留言指正,會持續(xù)更新。。。