使用push segue时,主细节应用程序立即崩溃

时间:2013-07-06 19:06:03

标签: ios objective-c uistoryboardsegue ipad

首先,如果这是一个重复的帖子,请随时指出正确的帖子,因为我在搜索数小时后没有找到它。

我在我的应用程序中使用MasterDetail viewController,在开发的第一周左右,没有其他ViewVontrollers或除默认值之外的segue。我编写了我的主要代码,Master和Detail viewController工作正常。一旦我从Detail View添加了另一个带有push segue的VC,我的应用程序立即崩溃。这是错误:

***Terminating app due to uncaught exception 'NSInvalidArgumentException', reason '-[UINavigationController setPlayer:]: unrecognized selector sent to instance ...'然后是一堆十六进制。

在AppDelegate.m中,如果我注释掉这一行:

rightViewController.delegate = rightViewController

然后应用程序将启动并且push segue将起作用,但现在,显然,如果我要在MasterView中选择一个单元格,它会崩溃,从而出现此错误:

***Terminating app due to uncaught exception 'NSInvalidArgumentException', reason '-[UINavigationController selectedPlayer:]: unrecognized selector sent to instance ...'然后是一堆十六进制。

以下是我认为相关的所有代码:

AppDelegate.m

#import "AppDelegate.h"
#import "LeftViewController.h"
#import "RightViewController.h"

@implementation AppDelegate

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
    UISplitViewController *splitViewController = (UISplitViewController *)self.window.rootViewController;
    UINavigationController *leftNavController = [splitViewController.viewControllers objectAtIndex:0];
    LeftViewController *leftViewController = (LeftViewController *)[leftNavController topViewController];
    RightViewController *rightViewController = [splitViewController.viewControllers objectAtIndex:1];

    Player *selectedPlayer = [[leftViewController preclears]objectAtIndex:0];
    [rightViewController setPlayer:selectedPlayer];

    leftViewController.delegate = rightViewController;
    return YES;
}

- (void)applicationWillTerminate:(UIApplication *)application
{
    // Called when the application is about to terminate. Save data if appropriate.   See also applicationDidEnterBackground:.
}

@end

LeftViewController.m(部分)

#pragma mark - Table view delegate

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

    [tableView deselectRowAtIndexPath:indexPath animated:YES];

    //Re-fetch the feed from the Postgres Database when a user selects an entry

    [JSONHTTPClient getJSONFromURLWithString:@"http://myurl" completion:^(NSDictionary *json, JSONModelError *err) {
    NSError* error = nil;
    _feed = [[PostgresFeed alloc] initWithDictionary:json error:&error];

    //Print the data fethced to NSLog in JSON format

    [[NSNotificationCenter defaultCenter] postNotificationName:@"myNotification" object:nil userInfo:[[json objectForKey:@"player"] objectAtIndex:indexPath.row]];

}];

Player *selectedPlayer = [_players objectAtIndex:indexPath.row];

if (_delegate) 
    {
        [_delegate selectedPlayer:selectedPlayer];
    }
}

所以,我做错了什么,但我无法弄清楚它是什么。我做了很多谷歌搜索,还没有找到答案。如果有人想知道,我是iOS和Obj C的新手,MasterDetail应用程序基于适用于iPad SplitViews的Ray Wenderlich教程。我还查看了一些关于segues的Scott Sherwood教程,但是没有找到任何答案。

如果需要更多代码,请告诉我。

1 个答案:

答案 0 :(得分:1)

错误消息

-[UINavigationController setPlayer:]: unrecognized selector ...

表示

RightViewController *rightViewController = [splitViewController.viewControllers objectAtIndex:1];

返回UINavigationController实例,而不是RightViewController实例 预期。解决方案取决于视图控制器层次结构的结构。 可能您必须继续类似于左视图控制器:

UINavigationController *rightNavController = [splitViewController.viewControllers objectAtIndex:1];
RightViewController *rightViewController = (RightViewController *)[rightNavController topViewController];