indexPath 和indexPath.row 之间的区别（iphone）
我对indexPath和indexPath.row感到困惑，tableView的每个单元格是否对应于一个indexPath？那么我们为什么要寻找这个indexPath的“行”呢？我检查了医生，但我认为这让我感到困惑。
我找到了这段代码：
// this method is used in case the user scrolled into a set of cells that don't have their app icons yet
- (void)loadImagesForOnscreenRows
{
if ([self.entries count] > 0)
{
NSArray *visiblePaths = [self.tableView indexPathsForVisibleRows];
for (NSIndexPath *indexPath in visiblePaths)
{
AppRecord *appRecord = [self.entries objectAtIndex:indexPath.row];
if (!appRecord.appIcon) // avoid the app icon download if the app already has an icon
{
[self startIconDownload:appRecord forIndexPath:indexPath];
}
}
}
}
你能解释一下两者之间的区别吗？
非常感谢
保罗
i am confused about indexPath and indexPath.row, does each cell of a tableView correspond to an indexPath? so why do we look for the "row" of this indexPath? i checked the doc but i think it confuses me.
i found this code :
// this method is used in case the user scrolled into a set of cells that don't have their app icons yet
- (void)loadImagesForOnscreenRows
{
if ([self.entries count] > 0)
{
NSArray *visiblePaths = [self.tableView indexPathsForVisibleRows];
for (NSIndexPath *indexPath in visiblePaths)
{
AppRecord *appRecord = [self.entries objectAtIndex:indexPath.row];
if (!appRecord.appIcon) // avoid the app icon download if the app already has an icon
{
[self startIconDownload:appRecord forIndexPath:indexPath];
}
}
}
}
Can you explain me the difference between the two?
Thanks a lot
Paul
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NSIndexPath 类的每个实例都有两个属性：行和节 (文档)
tableView的每个单元格对应唯一的indexPath（第M部分中的第N行）。通常只有一个部分，人们只使用
row来引用数据。Each instances of NSIndexPath class has two properties: row and section (Documentation)
Each cell of tableView corresponds to unique indexPath (N-th row in M-th section). Often there is only one section and people use only
rowto reference to the data.