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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。
Indicates the depth-first traversal order of the receiving index path and another index path.
Index path to compare.
This value must not be nil
. If the value is nil
, the behavior is undefined.
The 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.
NSIndexPath.h
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原文地址:http://www.cnblogs.com/zhgz/p/4524618.html