Question

我正在尝试使用一个Web视图，并使用三个不同的按钮将您带到此Web视图。每个人都会带你到另一个网站。我已经创建了一个新的webview类，在这个类中我有一个方法来设置它将去往哪个url。

在原始视图控制器中，我正在尝试向此方法发送不同的数字，但它表示没有已知的实例方法。

代码如下：

设置网址的方法

-(void)setUrlNo:(int)urlNo
{

    if (urlNo == 0) {

        url = @"http://www.twitter.com/ac3112";
    } else if (urlNo == 1) {
        url = @"http://www.facebook.com/ac3112";
    } else if (urlNo == 2) {
        url = @"http://www.adamcarlin.co.uk";

    }
}

准备segue方法

-(void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender
{
    if ([segue.identifier isEqualToString:@"Twitter"])
    {
        [segue.destinationViewController setUrlNo:1];

    }else if ([segue.identifier isEqualToString:@"FB"]) {
        [segue.destinationViewController setUrlNo:2];
    } else {
        [segue.destinationViewController setUrlNo:3];
    }


}

Answer 1

segue.destinationViewController返回id类型的对象。您需要将其强制转换为视图控制器类型，以便在没有警告的情况下发送消息：

[(YourViewController *)segue.destinationViewController setUrlNo:1];

Answer 2

要打开不同的网站并通过segue发送网址，您可以使用基于主视图控制器的此方法。您可以从每个表格单元格或按钮创建一个push segue并拖动到UIViewController，然后将下面的segue值放在那里以确保您获得正确的站点/值。

FollowViewController.h

@interface FollowViewController : UIViewController

@end

FollowViewController.m segue方法

- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender
{
     FollowDetailViewController *webController = [[FollowDetailViewController alloc] init];

    if ([[segue identifier] isEqualToString:@"Facebook"]) { // Facebook
    NSString *urlstr=@"https://www.facebook.com/";
    webController = [segue destinationViewController];
    webController.urlstr = urlstr;
    webController.title = @"Facebook"; // this sets the title of the next page

    }
    else if ([[segue identifier] isEqualToString:@"Instagram"]) { // Instagram
    NSString *urlstr=@"http://instagram.com/";
    webController = [segue destinationViewController];
    webController.urlstr = urlstr;
    webController.title = @"Instagram"; // this sets the title of the next page
    }
    else if ([[segue identifier] isEqualToString:@"Twitter"]) { // Twitter
    NSString *urlstr=@"https://twitter.com/";
    webController = [segue destinationViewController];
    webController.urlstr = urlstr;
    webController.title = @"Twitter"; // this sets the title of the next page
    }
    else if ([[segue identifier] isEqualToString:@"YouTube"]) { // YouTube
    NSString *urlstr=@"http://www.youtube.com/";
    webController = [segue destinationViewController];
    webController.urlstr = urlstr;
    webController.title = @"YouTube"; // this sets the title of the next page
    }
    self.title = @"Follow"; // This sets the title of the back button, and the title of this page
}

FollowDetailViewController.h

@interface FollowDetailViewController : UIViewController {
    NSString *urlstr;
}

@property (strong, nonatomic) IBOutlet UIWebView *WebView;
@property (strong, nonatomic) NSString *urlstr;

@end

FollowDetailViewController.m

@implementation FollowDetailViewController

@synthesize WebView;
@synthesize urlstr;

- (void)viewDidLoad
{
    [super viewDidLoad];

    NSURL *url = [NSURL URLWithString:urlstr];
    NSURLRequest *requestObj = [NSURLRequest requestWithURL:url];
    [self.WebView loadRequest:requestObj];
}

@end

祝你好运！

通过segues传递数据

2 个答案: