如何在 UISearchController 的子类中覆盖 "searchBar" 属性？

Question

我有这样的问题：如何隐藏UISearchBar的取消按钮？

我已经对UISearchController和UISearchBar进行了子类化，并在UISearchBar中覆盖了layoutSubviews方法。

如何使用自定义的UISearchBar重写我的自定义UISearchController中的searchBar属性？

更新1

为了实现具有自定义UISearchBar的属性，我在MyUISearchController中进行了以下操作：

@property(nonatomic, strong, readonly) UISearchBar *searchBar;

和

@synthesize searchBar=_searchBar;

- (UISearchBar *)searchBar {
    return [MySearchBar new];
}

但是UISearchController无论如何都使用默认的searchBar。

更新

在h文件中:

@interface MySearchController : UISearchController <UITableViewDelegate, UITableViewDataSource>

在m文件中：

@interface MySearchController () <UISearchDisplayDelegate, UISearchControllerDelegate,
UISearchBarDelegate, UISearchResultsUpdating, SearchAutocompleteLoader>

@property UISearchController *searchController;

@property (strong, nonatomic) UITableView *searchResultTable;
@property UIView *viewForSearchBar;
@property (nonatomic) NSInteger filterSettings;
@property (strong, nonatomic) UILabel *matchesLabel;
@property (strong, nonatomic) UIView *loading;
@property (strong, nonatomic) UIView *foggView;

@end

- (instancetype)initWith:(UIView *)viewForSearch foggView:(UIView *)view delegate:(id)delegate andResultTableView:(UITableView *)tableView
{
    self.viewForSearchBar = viewForSearch;
    self.searchResultTable = tableView;
    self.foggView = view;
    self.searchDelegate = delegate;
    [self configureSearchController];
    return self;
}

- (void)configureSearchController {
    self.searchController = [[UISearchController alloc] initWithSearchResultsController:nil];

    self.searchController.searchResultsUpdater = self;
    self.searchController.delegate = self;
    self.searchController.hidesNavigationBarDuringPresentation = NO;
    self.searchController.dimsBackgroundDuringPresentation = NO;
    [self loadFilterSettings];
    self.searchController.searchBar.delegate = self;
    [self.searchController.searchBar setShowsCancelButton:NO];
    //self.searchController.searchBar.searchBarStyle = UISearchBarStyleDefault;

    [self.searchController.searchBar setBackgroundImage:[UIImage imageWithCGImage:(__bridge CGImageRef)([UIColor clearColor])]];
    [self.searchController.searchBar setImage:[UIImage imageNamed:@"iconSearchSettings"] forSearchBarIcon:UISearchBarIconBookmark state:UIControlStateNormal];
    self.searchController.searchBar.frame = CGRectMake(0, 0, self.view.frame.size.width, self.viewForSearchBar.frame.size.height);
    self.viewForSearchBar.tintColor = [UIColor yellowColor];
   // [self.viewForSearchBar addSubview:self.searchController.searchBar];

    self.searchController.searchBar.barTintColor = [UIColor whiteColor];
    self.searchController.searchBar.tintColor = [UIColor blackColor];
    //self.searchController.searchBar.backgroundColor = [UIColor whiteColor];

    [self.viewForSearchBar addSubview:self.searchController.searchBar];

    for (UIView *subView in self.searchController.searchBar.subviews) {
        if ([subView isKindOfClass:[UITextField class]]) {
            [subView setTintColor:[UIColor blueColor]];
            [[(UITextField *) subView valueForKey:@"textInputTraits"] setValue:[UIColor blueColor] forKey:@"insertionPointColor"];
        }
    }

    [self.searchController setActive:YES];
    [self.searchController setActive:NO];
}

- Gikas

---

隐藏取消按钮是子类化 searchBar 的唯一原因吗？ - Warif Akhand Rishi

@WarifAkhandRishi 是的 - Gikas

@Gikas，请贴一些代码以便更好地理解。否则很难确定问题所在。解决此问题的方法是在视图控制器的viewsWillLayoutSubviews中隐藏取消按钮。 - Anmol Kukreja

@AnmolKukreja 已更新 - Gikas

Answer 1

UISearchController 的 searchBar 是一个计算属性，你需要先存储你的自定义搜索栏，然后在调用 searchBar 时返回它。

下面是一些 Swift 代码：

var mySearchBar = MySearchBar()

override var searchBar: UISearchBar {
    get{
        return mySearchBar;
    }
}

- wj2061

Answer 2

为了定制searchBar属性，首先通过子类化搜索栏(UISearchBar)开始定制过程。然后，在搜索控制器的子类中使用此自定义搜索栏，并最终在您的ViewController类中同时使用它们两个。

参考此教程： UISearchController Customization

- Himz

Answer 3

import UIKit

class MySearchController: UISearchController {

    override func viewWillLayoutSubviews() {
        super.viewWillLayoutSubviews()
        searchBar.showsCancelButton = false
    }
}

- Warif Akhand Rishi

---

我在https://dev59.com/smoy5IYBdhLWcg3wg-Ym中看到了这个解决方案，但是它并不起作用。 - Gikas

Answer 4

查看这个关于在Swift中自定义UISearchBar的教程：

自定义UISearchBar

Objective-C：在ViewDidLoad中添加代码。您已经声明了UISearchBar对象。

[searchBar setShowsCancelButton:NO]; 

Swift：在ViewDidLoad中

searchBar.showsCancelButton = false

- Kirit Modi