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。
【问题讨论】：
标签： ios objective-c
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
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