传递数据并从 VC 选项卡索引 4 转到 VC 选项卡索引 2

Question

我希望在单击“搜索”按钮时传递数据并从 Search VC（选项卡索引 4）转到 Classes VC（选项卡索引 2）。 Search VC 嵌入在 Tab View Controller 中。 Classes VC 嵌入在 Tab View Controller 和 Navigation Controller 中。见附图。

我尝试在以下代码中使用 seague，但我丢失了 Tab Bar

假设我创建了一个名为 SearchToClass 的海域，从 Search VC 到 Classes VC

#import "Search.h"    
#import "Classes.h"
#import "ClassNavigationController.h"

@interface Search(){

    NSString *sURL;
}

@end

@implementation Search

- (void)viewDidLoad
{
    [super viewDidLoad];
}

- (IBAction)btnSearch:(UIButton *)sender {

NSLog(@"This is the slider %@", lblStart.text);
sURL = @"&Start=";
sURL = [sURL stringByAppendingString:sStartTime];
sURL = [sURL stringByAppendingString:@"&End="];
sURL = [sURL stringByAppendingString:sEndTime];

[self performSegueWithIdentifier:@"SearhToClass" sender:self];

//======== I have also tried the following but couldn't pass the data and I lost the Tab Bar as well======================================
//ClassNavigationController *fromSearch =  (ClassNavigationController*)[storyboard instantiateViewControllerWithIdentifier:@"Classes"];
//[fromSearch setModalPresentationStyle:UIModalPresentationFullScreen];
//[self presentViewController:fromSearch animated:NO completion:nil];
//===================================================================
}

- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender {

    Classes *target = segue.destinationViewController;

    if ([segue.identifier isEqualToString:@"SearchToClass"]) {
    
        NSLog(@" To ClassesDet sURL : %@", sURL);
        target.urlFromSearch = sURL;
    }
 }
 @end

Answer 1

这是您可以执行的操作。如果要将数据从搜索 vc 传递到 类 vc.

1. 在类vc
中添加通知观察者

NotificationCenter.default
                .addObserver(forName:NSNotification
                    .Name(rawValue: "testKey"),
                             object:nil, queue:nil, using: yourMethodToBeCalled) //set notification observer

2. 当您搜索了该项目并想将其传递给 类 vc

NotificationCenter.default
            .post(name: NSNotification
                .Name(rawValue: "testKey"),
                  object: nil, userInfo: ["myData": true, "myList": myList])

3. 切换到选项卡
   self.tabBarController?.selectedIndex = 2

   注意：使用标签栏控制器时不需要 segue