用户开始输入时更改搜索器图标

Posted 2023-03-22

【中文标题】用户开始输入时更改搜索器图标

【英文标题】：Changing Searcher Icon when user start typing

【发布时间】：2016-04-13 11:43:06

【问题描述】：

当用户开始输入时，我正在尝试将 SearchBar 搜索图标更改为后退按钮，例如谷歌地图。

我使用了以下代码

[[[UISearchBar class] appearance] setImage:[UIImage imageNamed:@"icon_me"] forSearchBarIcon:UISearchBarIconSearch state:UIControlStateNormal];

但这会将 Icon 设置在开始本身，而不是在我们开始输入时 我只需要在 viewDidLoad 中写下这一行。

请帮助我。

【参考方案1】：

你需要实现UISearchBar的委托方法才能这样做。

- (void)searchBar:(UISearchBar *)searchBar textDidChange:(NSString *)searchText;   // called when text changes (including clear)
- (BOOL)searchBar:(UISearchBar *)searchBar shouldChangeTextInRange:(NSRange)range replacementText:(NSString *)text;

在委托方法中你需要这样做

UITextField *textField = [searchBar valueForKey:@"_searchField"];
textField.textColor = [UIColor brownColor]; //you can set text color
textField.leftViewMode = UITextFieldViewModeWhileEditing; //set leftViewMode or you can also set rightViewMode also

UIImageView *imgview = [[UIImageView alloc] initWithFrame:CGRectMake(0, 0, 20, 30)];
imgview.image = [UIImage imageNamed:@"searchIcon.png"]; //you need to set search icon for textfield's left/right view as you want

textField.leftView = imgview;
//textField.rightView = imgview; //you can set at right side also

【讨论】：

感谢您的回复。我已经尝试过了。但这对我不起作用