objective-c - 基本的 Objective C 语法问题

Question

谁能证实我对这行代码的怀疑。

NSUInteger newPath[] = {[indexPath section],0};

我很确定它是 NSUInteger 的 C 数组。我说得对吗？你甚至可以制作 Objective C 对象的 C 数组吗？

这里是上下文中的代码:

-(UITableViewCellEditingStyle)tableView:(UITableView *) tableViewEditingStyleForRowAtIndexPath:(NSIndexPath*)indexPath{

if ([self isToManyRelationshipSection:[indexPath section]]) {
    NSUInteger newPath[] = {[indexPath section],0};
    NSIndexPath *row0IndexPath = [NSIndexPath indexPathWithIndexes:newPath length:2];

    NSString *rowKey = [rowKeys nestedObjectAtIndexPath:row0IndexPath];
    NSString *rowLabel = [rowLabels nestedObjectAtIndexPath:row0IndexPath];
    NSMutableSet *rowSet = [managedObject mutableSetValueForKey:rowKey];//!!!: to-many?
    NSArray *rowArray = [NSArray arrayByOrderingSet:rowSet byKey:rowLabel ascending:YES];

    if ([indexPath row] >= [rowArray count]) {
        return UITableViewCellEditingStyleInsert;
    }

    return UITableViewCellEditingStyleDelete;
}
return UITableViewCellEditingStyleNone;

Answer 1

是的，你是对的。然而……

NSUInteger newPath[] = {[indexPath section],0};
NSIndexPath *row0IndexPath = [NSIndexPath indexPathWithIndexes:newPath length:2];

我强烈不鼓励您使用这种格式来创建用于UITableView 的NSIndexPath。 There's a convenience method to do this 更更简单:

NSIndexPath *row0IndexPath = [NSIndexPath indexPathForRow:0 inSection:[indexPath section]];