ios - objective-c UIViewController委托(delegate)

我有一个UIViewController，向其中添加了标签，按钮，tableView和searchView。我在系统中将此称为locationTableView

然后，我有另一个名为mapTabBarController的viewController，当用户单击按钮时，我将其称为代码

[[UIApplication sharedApplication] setStatusBarHidden:YES];
[self.navigationController setNavigationBarHidden:YES];
locationTableView = [self.storyboard instantiateViewControllerWithIdentifier:@"LocationTableViewController"];
[self.view addSubview:locationTableView.view];

我禁用了status bar和navigation bar，因为location view是屏幕上的直接覆盖，但仍显示我们的mapTabBar

我目前正在使用“取消”按钮，它实际上只是隐藏locationTableView并将导航栏和状态栏重新显示。我最初试图使此功能正常运行

- (IBAction)cancelButtonPressed:(id)sender {
    [[UIApplication sharedApplication] setStatusBarHidden: NO];
    [self.view removeFomSuperview];
}

这行得通，但是后来我不知道如何重新显示NavigationBar。因此，我想到了创建一个代表来做到这一点，因此我开始着手这一工作：

LocationTableViewController.h

#import <UIKit/UIKit.h>
@class LocationTableViewController;
@protocol LocationTableViewControllerDelegate;

@interface LocationTableViewController : UIViewController

    @property (weak, nonatomic) IBOutlet UITableView *locationTableView;
    - (IBAction)cancelButtonPressed:(id) sender;
    @property (strong, nonatomic) id<LocationTableViewControllerDelegate>delegate;
@end

@protocol LocationTableViewControllerDelegate <NSObject>

- (void) LocationTableViewcontroller:(LocationTableViewController *)viewController cancelButtonPressed:(CGFloat)value;

@end

LocationTableViewController.m

#import "LocationTableViewController.h"

@interface LocationTableViewController ()
{
    UISearchBar *searchBar;
}
@end

@implementation LocationTableViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view.
    [self navigationController].delegate = self;
    searchBar = [UISearchBar new];
    [searchBar setFrame: CGRectMake(8, 0, [[UIScreen mainScreen]bounds].size.width, 50)];
    [searchBar setTranslatesAutoresizingMaskIntoConstraints:YES];
    [self.locationTableView addSubview:searchBar];
}

- (void)didReceiveMemoryWarning {
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

/*
#pragma mark - Navigation

// In a storyboard-based application, you will often want to do a little preparation before navigation
- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender {
    // Get the new view controller using [segue destinationViewController].
    // Pass the selected object to the new view controller.
}
*/

- (IBAction)cancelButtonPressed:(id)sender {
    id<LocationTableViewControllerDelegate> strongDelegate = self.delegate;
    [strongDelegate LocationTableViewcontroller:self cancelButtonPressed:0.0f];
}
@end

然后在我的MapTabBarController.m中实例化它

@interface MapTabBarController () <FPPopoverControllerDelegate, PrivacyPopoverDelegate, UITabBarControllerDelegate, LocationTableViewControllerDelegate>
@end

我为此创建了函数：

- (void)LocationTableViewcontroller:(LocationTableViewController *)viewController cancelButtonPressed:(CGFloat)value {
    NSLog(@"We Clicked the Cancel Button!");
}

我遇到的问题是，它从未被调用-控制台中没有NSLog。不确定我做错了什么，所以需要换新的眼睛。

最佳答案

创建locationTableView时应该做什么

[[UIApplication sharedApplication] setStatusBarHidden:YES];
[self.navigationController setNavigationBarHidden:YES];
locationTableView = [self.storyboard instantiateViewControllerWithIdentifier:@"LocationTableViewController"];
[self.view addSubview:locationTableView.view];

// Add this line

locationTableView.delegate = mapTabBarController

关于ios - objective-c UIViewController委托(delegate)，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/27159606/