问题描述
我正在尝试将单元格的重新排序索引放入数组中.
I'm trying to get reordered index of cells into an array.
在viewDidLoad
cell.showsReorderControl = YES;
arrayTag = [NSMutableArray array];
//创建单元格时将indexPath.row保存为cell.tag.
//Saving indexPath.row as cell.tag while creating the cell.
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
.....
cell.tag = indexPath.row;
NSString *strCellTag = [NSString stringWithFormat:@"%d",cell.tag];
if(![arrayTag containsObject:strCellTag])
{
[arrayTag addObject:strCellTag];
}
return cell;
}
//我不确定这是否是正确的方法,但在下面我试图将更改保存到数组中.
//I'm not sure if this is the right way, but below I'm trying to save the changes to the array.
- (NSIndexPath *)tableView:(UITableView *)tableView targetIndexPathForMoveFromRowAtIndexPath:(NSIndexPath *)sourceIndexPath toProposedIndexPath:(NSIndexPath *)proposedDestinationIndexPath
{
[arrayTag replaceObjectAtIndex:sourceIndexPath.row withObject:[NSString stringWithFormat:@"%i",proposedDestinationIndexPath.row]];
[arrayTag replaceObjectAtIndex:proposedDestinationIndexPath.row withObject:[NSString stringWithFormat:@"%i",sourceIndexPath.row]];
return proposedDestinationIndexPath;
}
验证我NSLog
:
- (IBAction)doneButton:(id)sender
{
NSLog (@"Number of Objects in Array %i", arrayTag.count);
for (NSString *obj in arrayTag){
NSLog(@"From ArrayTag obj: %@", obj);
}
}
NSLog
没有按预期移动单元格结果.
NSLog
WITHOUT moving cells results as expected.
2013-07-10 17:50:47.291 MyApp[1634:c07] Number of Objects in Array 7
2013-07-10 17:50:47.292 MyApp[1634:c07] From ArrayTag obj: 0
2013-07-10 17:50:47.292 MyApp[1634:c07] From ArrayTag obj: 1
2013-07-10 17:50:47.292 MyApp[1634:c07] From ArrayTag obj: 2
2013-07-10 17:50:47.292 MyApp[1634:c07] From ArrayTag obj: 3
2013-07-10 17:50:47.293 MyApp[1634:c07] From ArrayTag obj: 4
2013-07-10 17:50:47.293 MyApp[1634:c07] From ArrayTag obj: 5
2013-07-10 17:50:47.293 MyApp[1634:c07] From ArrayTag obj: 6
NSLog
移动/改组单元格后似乎是错误的.我没有得到唯一值.
NSLog
AFTER moving/shuffling cells appears to be wrong. I'm not getting unique values.
2013-07-10 17:51:55.329 MyApp[1634:c07] Number of Objects in Array 7
2013-07-10 17:51:55.330 MyApp[1634:c07] From ArrayTag obj: 4
2013-07-10 17:51:55.330 MyApp[1634:c07] From ArrayTag obj: 5
2013-07-10 17:51:55.330 MyApp[1634:c07] From ArrayTag obj: 5
2013-07-10 17:51:55.330 MyApp[1634:c07] From ArrayTag obj: 5
2013-07-10 17:51:55.331 MyApp[1634:c07] From ArrayTag obj: 6
2013-07-10 17:51:55.331 MyApp[1634:c07] From ArrayTag obj: 6
2013-07-10 17:51:55.331 MyApp[1634:c07] From ArrayTag obj: 4
问:为什么我在重新排序后没有获得新的唯一值?如何获得保存在数组中的单元格的新顺序?
Q: Why am I not getting new unique values after reordering? How do I get the new order of cells saved in the array?
推荐答案
我终于找到了一个适用于 Apple 文档的解决方案.
I finally found a solution that works in Apple's Docs.
声明一个 NSMutableArray 属性 .h 或 .m: @property (strong, nonatomic) NSMutableArray *arrayTag;
Declare a NSMutableArray property .h or .m: @property (strong, nonatomic) NSMutableArray *arrayTag;
合成:@synthesize arrayTag;
在viewDidLoad
中初始化arrayTag = [[NSMutableArray alloc] init];
代码如下:
-(void)tableView:(UITableView *)tableView moveRowAtIndexPath:(NSIndexPath *)sourceIndexPath toIndexPath:(NSIndexPath *)destinationIndexPath
{
NSString *stringToMove = [arrayTag objectAtIndex:sourceIndexPath.row];
[arrayTag removeObjectAtIndex:sourceIndexPath.row];
[arrayTag insertObject:stringToMove atIndex:destinationIndexPath.row];
}
Apple 网站链接:清单 8-2:http://developer.apple.com/library/ios/#documentation/userexperience/conceptual/tableview_iphone/ManageReorderRow/ManageReorderRow.html
Link to Apple's site: Listing 8-2: http://developer.apple.com/library/ios/#documentation/userexperience/conceptual/tableview_iphone/ManageReorderRow/ManageReorderRow.html
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