ios 按下 UISearchBar x 按钮
声明：本页面是StackOverFlow热门问题的中英对照翻译，遵循CC BY-SA 4.0协议，如果您需要使用它，必须同样遵循CC BY-SA许可，注明原文地址和作者信息，同时你必须将它归于原作者（不是我）：StackOverFlow
原文地址: http://stackoverflow.com/questions/29135594/
Warning: these are provided under cc-by-sa 4.0 license. You are free to use/share it, But you must attribute it to the original authors (not me):
StackOverFlow
UISearchBar x button pressed
提问by Fabio
How handle the event when press the 'x' button?
按下“x”按钮时如何处理事件？
I try this method but not works.
我尝试了这个方法，但没有用。
-(void)searchBarCancelButtonClicked:(UISearchBar *)searchBar{
}
回答by Eric Johnson
I don't think there's an easy way to hook into the X button.
我认为没有一种简单的方法可以连接到 X 按钮。
However, you can hook into its direct consequence: cleared text.
但是，您可以了解其直接后果：清除文本。
Try this:
尝试这个：
func searchBar(searchBar: UISearchBar, textDidChange searchText: String) {
if searchText == "" {
print("UISearchBar.text cleared!")
}
}
The side effect is this also gets called when you manually clear your text.
副作用是当您手动清除文本时也会调用它。
回答by funct7
A rather hacky way to do it but this works.
一种相当hacky的方式来做到这一点，但这是有效的。
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
}
The success of this code hinges on the fact that when tapping the clear button of the search bar, searchBar(_:shouldChangeTextIn:replacementText:) -> Boolis not called. Instead when the delete button of the keyboard is tapped, the method is called.
这段代码的成功取决于当点击搜索栏的清除按钮时，searchBar(_:shouldChangeTextIn:replacementText:) -> Bool不会被调用。相反，当点击键盘的删除按钮时，会调用该方法。
回答by Kedar Sukerkar
Swift 5.2, Xcode 11.4
斯威夫特 5.2，Xcode 11.4
This one worked for me.
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)
}
回答by Dejan
Simplest solution in Swift 5.0
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()
}
}
}
回答by Eray Diler
I had the same issue, tried to solve it with accessing searchBar's subview textField but it caused my app crash, and with a last effort i found this post.
我遇到了同样的问题，试图通过访问 searchBar 的子视图 textField 来解决它，但它导致我的应用程序崩溃，最后我找到了这篇文章。
Another issue was that,
另一个问题是，
- (void)searchBar:(UISearchBar *)searchBar textDidChange:(NSString *)searchText
- (void)searchBar:(UISearchBar *)searchBar textDidChange:(NSString *)searchText
is being called twice when cancel button clicked, see also this.
单击取消按钮时将被调用两次，另请参见this。
And lastly what i did is;
最后我所做的是；
- (void)searchBar:(UISearchBar *)searchBar textDidChange:(NSString *)searchText
{
if (![searchText isEqualToString:self.searchText]) {
self.searchText = searchText;
return;
}
NSLog(@"Clear clicked");
}
This solved my issue.
这解决了我的问题。
回答by Mona
- (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];
}
}
回答by Dj tropycool
This works for me
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;
}
And you can use the TextFields Delegate
你可以使用 TextFields 委托
- (BOOL)textFieldShouldClear:(UITextField *)textField {
//Do something here...
}
回答by Mohan
self.mySearchBar.searchTextField.delegate = self
self.mySearchBar.searchTextField.delegate = self
extension myViewController: UISearchTextFieldDelegate {
扩展 myViewController: UISearchTextFieldDelegate {
func textFieldShouldClear(_ textField: UITextField) -> Bool {
DispatchQueue.main.asyncAfter(deadline: .now() + 0.1) {
self.mySearchBar.searchTextField.resignFirstResponder()
}
return true
}
}
}
回答by Karanveer Singh
When you press the cross button on Search Bar, following method gets called:
当您按下搜索栏上的十字按钮时，将调用以下方法：
func searchBarShouldBeginEditing(_ searchBar: UISearchBar) -> Bool {
}
回答by S R Nayak
func searchBar(_ searchBar: UISearchBar, textDidChange searchText: String){
print("searchText: \(searchText)")
if searchText.count > 0
{
// Show ur content
}
else
{
// Hide your content
}
}
