selectedTextRange return UISearchbar 中为零 iOS

Question

我有一个UISearchBar，我得到了UITextfield，然后我想设置选定的文本范围，但它总是return nil。这是我的代码：

UITextField *searchField = [self.searchBar valueForKey:@"_searchField"];
[searchField becomeFirstResponder]; // focus to this searchfield

还有我填写的文字：

self.searchBar.text = @"This is text";

并检查 UITextField 文本是否已填写并且确实如此。尽管如此，关于UITextPosition 和UITextRange return nil:

的所有方法

UITextRange *selectedRange = [searchField selectedTextRange]; //selectedRange = nil
UITextPosition *newPosition = [searchField positionFromPosition:selectedRange.start offset:addressToComplete.street.length]; //newPosition = nil
UITextRange *newRange = [searchField textRangeFromPosition:newPosition toPosition:newPosition]; //newRange = nil

我的代码有错吗？

Answer 1

您尝试过记录 UITextField *searchField 吗？从它的外观来看它是零..我认为你的代码应该是..

(UITextField *)[self.searchBar valueForKey:@"_searchField"]

（[在尝试你的代码之后] OooOoKayyy.. 它有效.. 哈哈哈..）顺便说一下，这就是我在 searchBar 中获取 UITextField 的方式..

for (id object in [[[self.searchBar subviews] objectAtIndex:0] subviews])
{
    if ([object isKindOfClass:[UITextField class]])
    {
        UITextField *searchField = (UITextField *)object;
        break;
    }
}

首先我尝试了你所拥有的是：

UITextField *searchField = (UITextField *)[searchBar valueForKey:@"_searchField"];
searchBar.text = @"This is text";
// and logging your searchField.text here.. returns nil/empty..

我试过这样重新排列它...

 searchBar.text = @"This is text";
 UITextField *searchField = (UITextField *)[searchBar valueForKey:@"_searchField"];
 NSLog(@"searchFields.text :%@", searchField.text);

我再次在 -(void)viewDidLoad 下尝试了您的代码，但没有用，是的，正如您所说，它始终为零..现在看起来像这样..

- (void)viewDidLayoutSubviews
{
    [super viewDidLayoutSubviews];
    searchBar.text = @"This is text"; // not important

    UITextField *searchField = [searchBar valueForKey:@"_searchField"];
    [searchField becomeFirstResponder];

     UITextRange *selectedRange = [searchField selectedTextRange]; //selectedRange = not nil anymore

     NSLog(@"searchField.text :%@ -> selectedRange :%@\n\n" , searchField.text, selectedRange);
}
//i've also tried it inside uibutton's event and i worked .. >.<

我以编程方式选择了 TextRange（出于示例目的），可能与 xibs 自动布局或其他东西有关（很奇怪，我没有体验过）但它就在那里，试试吧.. :)

希望对你有所帮助..

编码愉快..干杯！

selectedTextRange return UISearchbar 中为零 iOS

selectedTextRange return nil in UISearchbar iOS

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