Question

我在标签栏控制器中有两个视图控制器。 ViewControllerA有两个按钮（MybuttonA和MybuttonB，在故事板中未选中启用框）。 ViewControllerB是一个TableViewController。我想在ViewControllerB表中选择特定行时启用ViewControllerA中的按钮。

非常感谢任何帮助...

ViewControllerA.h

#import <UIKit/UIKit.h>
@interface  ViewControllerA : UIViewController {
IBOutlet UIButton * MybuttonA;
    IBOutlet UIButton * MybuttonB;

}
-(IBAction)mybuttonaction:(id)sender;
@property(strong,nonatomic)UIButton *MybuttonA;
@property(strong,nonatomic)UIButton *MybuttonB;

@end

ViewControllerA.m

#import "ViewControllerA.h"
@interface ViewControllerA ()
@end

@implementation ViewControllerA
@synthesize MybuttonA;
@synthesize MybuttonB;



- (void)viewDidLoad
{
[super viewDidLoad];
// Do any additional setup after loading the view.
}


-(IBAction)mybuttonaction:(id)sender{
NSString * link = @"https://google.com";

[[UIApplication sharedApplication] openURL:[NSURL URLWithString:link]];
 }

ViewControllerB.h

#import <UIKit/UIKit.h>
#import "ViewControllerA.h"
@interface ViewControllerB : UITableViewController{

    ViewControllerA *viewcontrollerA;
}
@property (nonatomic, retain) ViewControllerA *viewcontrollerA;
@end

ViewControllerB.m

#import "ViewControllerB.h"
#import "ViewControllerA.h"

@interface ViewControllerB () {

}

@end

@implementation ViewControllerB
@synthesize  viewcontrollerA;

- (void)viewDidLoad
{
[super viewDidLoad];

   self.title = @"CONTENTS";

     self.refreshControl = [[UIRefreshControl alloc] init];
     [self.refreshControl addTarget:self action:@selector(reload)   forControlEvents:UIControlEventValueChanged];
[self reload];
[self.refreshControl beginRefreshing];

}

#pragma mark - Table View

 - (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
 {return 1;}

 - (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
 {
 {return 5;}
 }

     - (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
 {
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:@"Cell" forIndexPath:indexPath];
    cell.textLabel.text = [NSString stringWithFormat: @"Cell #%d", indexPath.row];

}

return cell;
}



 - (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {

   UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:@"Cell" forIndexPath:indexPath];
    NSString* value = [tableView cellForRowAtIndexPath:indexPath].textLabel.text;



    if ([value isEqual:@"1"]){
    viewcontrollerA.MybuttonA.enabled=YES;

    }


    else if ([value isEqual:@"2"])
    {
                viewcontrollerA.MybuttonB.enabled=YES;

    }


    }



else {
    [tableView deselectRowAtIndexPath:indexPath animated:NO];
}
 }


@end

Answer 1

在ViewControllerB中，将以下行添加到viewDidLoad：

viewControllerA = [self.tabBarController.viewControllers objectAtIndex:0];

然后，您的其余代码应该可以正常工作。

请注意，除非您有充分的理由，否则通常应使用self.viewControllerA而不是直接访问iVar。： - ）

如何在ViewController A中启用UI按钮在TableViewController B中进行行选择时。两个View控制器都嵌套在TabarController中

1 个答案: