如何递增NSIndexPath
如何递增NSIndexPath
提问于 2012-03-09 22:53:33
我有一个想要使用索引路径的数据环境。当我遍历数据时，我想递增NSIndexPath的最后一个节点。到目前为止，我拥有的代码是：
int nbrIndex = [indexPath length];
NSUInteger *indexArray = (NSUInteger *)calloc(sizeof(NSUInteger),nbrIndex);
[indexPath getIndexes:indexArray];
indexArray[nbrIndex - 1]++;
[indexPath release];
indexPath = [[NSIndexPath alloc] initWithIndexes:indexArray length:nbrIndex];
free(indexArray);这感觉有点笨拙--有没有更好的方法呢？
回答 4
Stack Overflow用户
回答已采纳
发布于 2012-03-09 23:01:31
你可以试试这个--也许同样笨拙，但至少短一点：
NSInteger newLast = [indexPath indexAtPosition:indexPath.length-1]+1;
indexPath = [[indexPath indexPathByRemovingLastIndex] indexPathByAddingIndex:newLast];Stack Overflow用户
发布于 2012-08-09 10:25:13
这样就少了一行：
indexPath = [NSIndexPath indexPathForRow:indexPath.row+1 inSection:actualIndexPath.section];
Stack Overflow用户
发布于 2015-10-30 16:19:51
在Swift上查看我的解决方案：
func incrementIndexPath(indexPath: NSIndexPath) -> NSIndexPath? {
var nextIndexPath: NSIndexPath?
let rowCount = numberOfRowsInSection(indexPath.section)
let nextRow = indexPath.row + 1
let currentSection = indexPath.section
if nextRow < rowCount {
nextIndexPath = NSIndexPath(forRow: nextRow, inSection: currentSection)
}
else {
let nextSection = currentSection + 1
if nextSection < numberOfSections {
nextIndexPath = NSIndexPath(forRow: 0, inSection: nextSection)
}
}
return nextIndexPath
}页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/9636086
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