presentViewController with storyboards显示黑色视图

Question

我搜索了SO，但是没有找到答案。
我在storyboard主UITableViewController中创建了一个名为A的简单按钮。和另一个名为B的ViewController，它有webView和close按钮。
它没有以任何形式连接到主UITableViewController A
现在我想打开B视图控制器窗体A，然后关闭B视图控制器与它自己的关闭按钮。
但无论如何我尝试B视图控制器是黑色和空白。

ViewController B(弹出视图)

#import "TAFBLoginDialogViewController.h"
@interface TAFBLoginDialogViewController ()
@end
@implementation TAFBLoginDialogViewController
-(id)initWithAppId:(NSString *)apiKey
  requestPremision:(NSString *)requestPremision
          delegate:(id<TAFBLoginDialogViewdelegate>)delegate
          storyBoardName:(NSString*) storyBoardName
{
    //self = [super initWithNibName:@"FBLoginDialog" bundle:nil];
    UIStoryboard *storyboard = [UIStoryboard storyboardWithName:storyBoardName bundle:nil];
    UIViewController *viewController = [storyboard instantiateViewControllerWithIdentifier:@"FBLoginDialog"];
    if (self) {
        // Custom initialization
        self.apiKey = apiKey;
        self.requestPremision = requestPremision;
        self.delegate = delegate;
    }
    return self;
}

- (IBAction)closeTap:(id)sender
{
    [self.delegate closeTaped];
}

-(void)login
{
}
-(void)logout
{

}
-(void)checkForAccessToken:(NSString*)urlString
{
}
-(void)checkLoginRequired:(NSString*)urlString
{
    [self.delegate displayRequired];
}
- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
    self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
    if (self) {
        // Custom initialization
    }
    return self;
}
- (void)viewDidLoad
{
    [super viewDidLoad];
    // Do any additional setup after loading the view.
}
- (void)didReceiveMemoryWarning
{
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

UITableViewController A(主视图控制器，我试图打开B)

#import "TAFMETableViewController.h"

@interface TAFMETableViewController ()
{
}
@end
@implementation TAFMETableViewController
- (id)initWithStyle:(UITableViewStyle)style
{
    self = [super initWithStyle:style];
    if (self) {
        // Custom initialization
    }
    return self;
}
-(void) awakeFromNib
{

    [super awakeFromNib];
}
- (void)viewDidLoad
{
    [super viewDidLoad];
}
- (void)didReceiveMemoryWarning
{
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}
#pragma mark - Table view data source
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
{
#warning Potentially incomplete method implementation.
    // Return the number of sections.
    return 1;
}
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
#warning Incomplete method implementation.
}

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
    return cell;
}

- (IBAction)handleOpenFBDialog:(id)sender {
    UIStoryboard * storyboard = self.storyboard;
    NSString * storyboardName = [storyboard valueForKey:@"name"];
    self.appId = @"11111";
    self.permissions =@"public_stream";
    if(_loginDialogView ==nil)
    {
        self.LoginDialogViewController = [[TAFBLoginDialogViewController alloc] initWithAppId:_appId
                                                               requestPremision:_permissions
                                                                delegate:self storyBoardName:storyboardName];
        self.loginDialogView = _LoginDialogViewController.view;
    }
    [self.LoginDialogViewController checkLoginRequired:@"tst"];
    NSLog(@"Click!");
}

-(void)accessTokenFound:(NSString*)accessToken
{
    NSLog(@"accessTokenFound Click!");
}
-(void)displayRequired
{
    NSLog(@"displayRequired Click!");
    [self presentViewController:_LoginDialogViewController animated:YES completion:nil];
}
-(void)closeTaped
{
    NSLog(@"closeTaped Click!");
    [self dismissViewControllerAnimated:NO completion:nil];
}

@end

头文件:

@protocol TAFBLoginDialogViewdelegate
-(void)accessTokenFound:(NSString*)accessToken;
-(void)displayRequired;
-(void)closeTaped;
@end

@interface TAFBLoginDialogViewController : UIViewController<UIWebViewDelegate>
{
    //ivars
//    UIWebView *_webview;
//    NSString* _apiKey;
//    NSString* _requestPremision;
//    id <TAFBLoginDialogViewdelegate> _delegate;
}
@property (retain) IBOutlet UIWebView *webView;
@property (copy) NSString *apiKey;
@property (copy) NSString *requestPremision;
@property (assign) id<TAFBLoginDialogViewdelegate> delegate;
-(id)initWithAppId:(NSString*)apiKey
          requestPremision:(NSString*)requestPremision
          delegate:(id<TAFBLoginDialogViewdelegate>)delegate
          storyBoardName:(NSString*) storyBoardName;
- (IBAction)closeTap:(id)sender;
-(void)login;
-(void)logout;
-(void)checkForAccessToken:(NSString*)urlString;
-(void)checkLoginRequired:(NSString*)urlString;

@end

我在tableviewa中有一个按钮触发:

- (IBAction)handleOpenFBDialog:(id)sender  

则此函数初始化ViewController B调用:

[self.LoginDialogViewController checkLoginRequired:@"tst"];

应该显示ViewController B但它只能显示黑屏。

Answer 1

在你的initWithAppID方法中，你从故事板实例化你的视图控制器，然后不对它做任何事情。然后你有一个if (self)初始化块但是你从来没有初始化过self。

看起来你想要做的是设置self等于你从storyboard实例化的视图控制器然后设置它的属性。

它可能使这个类方法更有意义，因为你分配一个视图控制器对象，在它的init方法中，你从storyboard中创建另一个，并忽略你分配的那个。

+(instancetype) TAFBLoginDialogViewControllerWithAppID:(NSString *)apiKey
  requestPremision:(NSString *)requestPremision
          delegate:(id<TAFBLoginDialogViewdelegate>)delegate
          storyBoardName:(NSString*) storyBoardName
{
    UIStoryboard *storyboard = [UIStoryboard storyboardWithName:storyBoardName bundle:nil];
    TAFBLoginDialogViewController *viewController = [storyboard instantiateViewControllerWithIdentifier:@"FBLoginDialog"];
    // Custom initialization
    viewController.apiKey = apiKey;
    viewController.requestPremision = requestPremision;
    viewController.delegate = delegate;
    return viewController; 
}