如何以编程方式选择表中的行

发布于 2024-12-28 11:54:25 字数 566 浏览 0 评论 0原文

我有一个用户可以查看的表。当用户摇动他的设备时，我希望选择随机行。我该怎么做？

我识别了摇动手势，我可以创建一个不超过列表计数的随机整数，但我找不到正确的代码来在表中突出显示该行。

在苹果的文档中我发现：

NSIndexPath *rowToSelect;  // assume this exists and is set properly
UITableView *myTableView;  // assume this exists

[myTableView selectRowAtIndexPath:rowToSelect animated:YES scrollPosition:UITableViewScrollPositionNone;
[myTableView scrollToRowAtIndexPath:rowToSelect atScrollPosition:UITableViewScrollPositionNon animate:YES];

但我无法让它工作。我有一个 UITableView *myTableView。我使用随机整数作为 rowToSelect。

原文

I have a table which is viewed by the user. As the user shakes his device, I want a random row to be selected. How do I do this?

I have the shake gesture recognized, I can create an random integer that doesn't exceed the list count, but I can't find the right code to have that row highlighted in the table.

In Apple's documentation I found:

NSIndexPath *rowToSelect;  // assume this exists and is set properly
UITableView *myTableView;  // assume this exists

[myTableView selectRowAtIndexPath:rowToSelect animated:YES scrollPosition:UITableViewScrollPositionNone;
[myTableView scrollToRowAtIndexPath:rowToSelect atScrollPosition:UITableViewScrollPositionNon animate:YES];

but I can't get it working. I have a UITableView *myTableView. I have used the randomized integer as the rowToSelect.

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层林尽染 2025-01-04 11:54:26

这就是我让它发挥作用的方式。我保留了以下行：

NSIndexPath *scrollIndexPath = [NSIndexPath indexPathForRow:randomRij inSection:0];

我添加了以下行：

[eenTabelView selectRowAtIndexPath:scrollIndexPath animated:NO scrollPosition:UITableViewScrollPositionNone];

我评论了以下行：

//[[self eenTabelView] scrollToRowAtIndexPath:scrollIndexPath atScrollPosition:UITableViewScrollPositionNone animated:NO];

This is how I got it working. I kept the following line:

NSIndexPath *scrollIndexPath = [NSIndexPath indexPathForRow:randomRij inSection:0];

I added the following lines:

[eenTabelView selectRowAtIndexPath:scrollIndexPath animated:NO scrollPosition:UITableViewScrollPositionNone];

I commented the following line:

//[[self eenTabelView] scrollToRowAtIndexPath:scrollIndexPath atScrollPosition:UITableViewScrollPositionNone animated:NO];

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东京女 2025-01-04 11:54:26

重要规则：所有 UI 更改都必须在主线程中完成。
添加

if (![NSThread isMainThread])
{
    [self performSelectorOnMainThread:_cmd withObject:(%YOUR_OBJECT_TAKEN_IN_THIS_SELECTOR) waitUntilDone:Yes];
}

在代码之前

以在主线程中运行它，或者（更正确的变体）将所有 UI 更改提取到单独的方法并在主线程中调用它。例子：

-(void)yourSelector
{
…
    UI changes
…
}

-(IBOutlet)yourAction
{
    [self performSelectorOnMainThread:@selector(yourSelector) withObject:nil waitUntilDone:Yes];
}

Important rule: all UI changes must be done in Main Thread.
Add

if (![NSThread isMainThread])
{
    [self performSelectorOnMainThread:_cmd withObject:(%YOUR_OBJECT_TAKEN_IN_THIS_SELECTOR) waitUntilDone:Yes];
}

before your code to run it already in main thread OR (more correct variant) extract all your UI changes to separate method and call it in main thread.

Example:

-(void)yourSelector
{
…
    UI changes
…
}

-(IBOutlet)yourAction
{
    [self performSelectorOnMainThread:@selector(yourSelector) withObject:nil waitUntilDone:Yes];
}

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