按下UISearchBar x按钮

Question

按下＆＃39; x＆＃39;按钮？

我尝试这种方法但不起作用。

-(void)searchBarCancelButtonClicked:(UISearchBar *)searchBar{

}

Answer 1

我认为没有一种简单的方法可以挂钩X按钮。

但是，您可以直接考虑其结果：清除文本。

试试这个：

func searchBar(searchBar: UISearchBar, textDidChange searchText: String) {
    if searchText == "" {
        print("UISearchBar.text cleared!")
    }
}

副作用是手动清除文本时也会调用它。

Answer 2

Swift 5.2，Xcode 11.4

这个对我有用。

if let searchTextField = self.categoriesSearchBar.value(forKey: "searchField") as? UITextField , let clearButton = searchTextField.value(forKey: "_clearButton")as? UIButton {

     clearButton.addTarget(self, action: #selector(self.yourFunction), for: .touchUpInside)
}

Answer 3

一种相当古怪的方法，但是可行。

private var didTapDeleteKey = false

func searchBar(_ searchBar: UISearchBar,
               shouldChangeTextIn range: NSRange,
               replacementText text: String) -> Bool
{
    didTapDeleteKey = text.isEmpty

    return true
}

func searchBar(_ searchBar: UISearchBar,
               textDidChange searchText: String)
{
    if !didTapDeleteKey && searchText.isEmpty {
        // Do something here
    }

    didTapDeleteKey = false
}

此代码的成功取决于以下事实：点击搜索栏的清除按钮时，不会调用searchBar(_:shouldChangeTextIn:replacementText:) -> Bool。取而代之的是，当点击键盘上的删除按钮时，将调用该方法。

Answer 4

我遇到了同样的问题，试图通过访问searchBar的子视图textField解决它，但它导致我的应用程序崩溃，并且在最后的努力中我找到了这个post。

另一个问题是，

- (void)searchBar:(UISearchBar *)searchBar textDidChange:(NSString *)searchText

单击取消按钮时，

被调用两次，另请参阅this。

最后我做的是;

- (void)searchBar:(UISearchBar *)searchBar textDidChange:(NSString *)searchText
{
    if (![searchText isEqualToString:self.searchText]) {
        self.searchText = searchText;
        return;
    }
    NSLog(@"Clear clicked");
}

这解决了我的问题。

Answer 5

这对我有用

-(UITextField*)getUITexfieldInUISearchBar:(UIView*)aSearchBar{
UITextField *searchBarTextField;
for (UIView *subView in [aSearchBar subviews]){
    if ([subView isKindOfClass:[UITextField class]])
    {
        searchBarTextField = (UITextField *)subView;
        [searchBarTextField setDelegate:self];
        break;

    }else if ([subView isKindOfClass:[UIView class]]){
        [self getUITexfieldInUISearchBar:subView];
    }
}
  return searchBarTextField;
}

您可以使用TextFields Delegate

- (BOOL)textFieldShouldClear:(UITextField *)textField {
   //Do something here...
}

Answer 6

您可以通过符合“UISearchBarDelegate”连接到“取消按钮”单击事件，然后实现“searchBarCancelButtonClicked”方法

Answer 7

我认为这个问题最简单的解决方案是：

func searchBar(_ searchBar: UISearchBar, textDidChange searchText: String) {
     if searchText.isEmpty {
             DispatchQueue.main.async {
              searchBar.resignFirstResponder()
             }
 }

Answer 8

func searchBar(_ searchBar: UISearchBar, textDidChange searchText: String){
    print("searchText: \(searchText)")
    if searchText.count > 0
    {
        // Show ur content
    }
    else
    {
        // Hide your content
    }
}

Answer 9

- (void)searchBar:(UISearchBar *)searchBar textDidChange:(NSString *)searchText
{
    if (searchText.length == 0) {
         //clear button (x) on the search bar is cliecked, so clear the table
        [self clearTable];
    }
}

Answer 10

...正常工作

Traceback (most recent call last):
  File "modeltraining.py", line 29, in <module>
    sr,audio = read(source + path)
  File "C:\Users\RAAM COMPUTERS\Anaconda3\lib\site-packages\scipy\io\wavfile.py", line 233, in read
    fid = open(filename, 'rb')
PermissionError: [Errno 13] Permission denied: 'development_set/'

Answer 11

Swift 5.0

中最简单的解决方案

func searchBar(_ searchBar: UISearchBar, textDidChange searchText: String) {
    if searchText.isEmpty {
        DispatchQueue.main.asyncAfter(deadline: .now() + 0.1) {
            searchBar.resignFirstResponder()
        }
    }
}

Answer 12

self.mySearchBar.searchTextField.delegate =自我

扩展名myViewController：UISearchTextFieldDelegate {

func textFieldShouldClear(_ textField: UITextField) -> Bool {
    DispatchQueue.main.asyncAfter(deadline: .now() + 0.1) {
        self.mySearchBar.searchTextField.resignFirstResponder()
    }
    return true
}

}

Answer 13

按下搜索栏上的十字按钮时，将调用以下方法：

func searchBarShouldBeginEditing(_ searchBar: UISearchBar) -> Bool {
}

Answer 14

直到苹果发布正确的委托方法来处理清除按钮事件，此方法将从Xcode 12开始生效。要求：> = iOS13

尽可能获取对searchBar clearButton的引用。

UIButton *searchBarTextFieldClearButton = [self.searchBar.searchTextField valueForKey:@"_clearButton"];
if (searchBarTextFieldClearButton) {
    [searchBarTextFieldClearButton addTarget:self action:@selector(searchTextFieldClearButtonTapHandler) forControlEvents:UIControlEventTouchUpInside];
}

迅速：

extension UISearchTextField {
   var clearButton: UIButton? {
      return value(forKey: "_clearButton") as? UIButton
   }
}
searchBar.searchTextField.clearButton.addTarget(self, #selector(handler), .touchUpInside) //bllah

请务必记住，您的“操作-searchTextFieldClearButtonTapHandler”是最后一次调用，这一点非常重要。也就是说，在委托方法- (void)searchBar:(UISearchBar *)searchBar textDidChange:(NSString *)searchText

之后

Answer 15

func searchBar(_ searchBar: UISearchBar, textDidChange searchText: String) {


    let inputString = searchText.trimmingCharacters(in: NSCharacterSet.whitespacesAndNewlines)

    if inputString.characters.count > 0
    {

    }
    else
    {
          //Write code here for Clear button action
    }
}