这里还有其他正确答案(你应该读到,因为它们更加深入),但我经过阅读了我可以找到的所有解决办法,就在一个多星期的时间里进行了斗争,因为有一点(我发现!)有全面的例子。

Rules for this to work: 1. Changes must be made directly to the array that contains the items you re displaying in the UITableView. If you set some value in a UITableViewCell in the tableView:cellForRowAtIndexPath: method to equal values in self.expandableArray, then changes must also be made to self.expandableArray in order for these methods to work.

1. changes to the array of items that are displayed in the tableView must be made in-between [tableView beginUpdates] and [tableView endUpdates]
2. The count of the indexPaths array must equal the count of the additional items you re adding to the tableView (I think that s obvious, but it doesn t hurt to point that out)

这里是一个非常简单的例子,可以自行工作。

    @interface MyTableViewController ()
@property (nonatomic, strong) NSMutableArray *expandableArray;
@property (nonatomic, strong) NSMutableArray *indexPaths;
@property (nonatomic, strong) UITableView *myTableView;
@end

@implementation MyTableViewController

- (void)viewDidLoad
{
    [self setupArray];
}

- (void)setupArray
{
    self.expandableArray = @[@"One", @"Two", @"Three", @"Four", @"Five"].mutableCopy;
}

- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
{
    return 1;
}

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
    return self.expandableArray.count;
}

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
    //here you should create a cell that displays information from self.expandableArray, and return it
}

//call this method if your button/cell/whatever is tapped
- (void)didTapTriggerToChangeTableView
{
    if (/*some condition occurs that makes you want to expand the tableView*/) {
        [self expandArray]
    }else if (/*some other condition occurs that makes you want to retract the tableView*/){
        [self retractArray]
    }
}

//this example adds 1 item
- (void)expandArray
{
    //create an array of indexPaths
    self.indexPaths = [[NSMutableArray alloc] init];
    for (int i = theFirstIndexWhereYouWantToInsertYourAdditionalCells; i < theTotalNumberOfAdditionalCellsToInsert + theFirstIndexWhereYouWantToInsertYourAdditionalCells; i++) {
        [self.indexPaths addObject:[NSIndexPath indexPathForRow:i inSection:0]];
    }

    //modify your array AND call insertRowsAtIndexPaths:withRowAnimation: INBETWEEN beginUpdates and endUpdates
    [self.myTableView beginUpdates];
    //HERE IS WHERE YOU NEED TO ALTER self.expandableArray to have the additional/new data values, eg:
    [self.expandableArray addObject:@"Six"];
    [self.myTableView insertRowsAtIndexPaths:self.indexPaths withRowAnimation:(UITableViewRowAnimationFade)];  //or a rowAnimation of your choice

    [self.myTableView endUpdates];
}

//this example removes all but the first 3 items
- (void)retractArray
{
    NSRange range;
    range.location = 3;
    range.length = self.expandableArray.count - 3;

    //modify your array AND call insertRowsAtIndexPaths:withRowAnimation: INBETWEEN beginUpdates and endUpdates
    [self.myTableView beginUpdates];
    [self.expandableArray removeObjectsInRange:range];
    [self.myTableView deleteRowsAtIndexPaths:self.indexPaths withRowAnimation:UITableViewRowAnimationFade];  //or a rowAnimation of your choice
    [self.myTableView endUpdates];
}

@end

我希望这节省了许多人的时间和头痛。 如果你这样做的话,你就不必重载整个表格,以更新该词,并且你可以选择一个动画。 自由守则,不打脚。

你只能增加阵列中的物体,并在纽特州点击重载你的表。

[array addobject:@""];
[tableview reloaddata];