UINavigationController 不返回答案

【问题标题】：UINavigationController not returningUINavigationController 不返回
【发布时间】：2013-02-09 23:12:33
【问题描述】：

我正在尝试建立一个 ViewControllers 系统并在它们之间导航。我正在尝试在DefaultViewController 和CreateViewController 之间导航。我是 iOS 编程的新手，所以我很难弄清楚这一点。我主要尝试使用 Utility App 模板中的代码。如果有人能发现我的错误，那就太好了！

当我点击取消按钮时会到达日志CreateViewController: cancel，但不会到达DefaultViewController: createViewControllerDidFinish。

这是相关代码：

DefaultViewController.h

#import <UIKit/UIKit.h>
#import <Social/Social.h>
#import "CreateViewController.h"

@interface DefaultViewController : UIViewController <CreateViewControllerDelegate, UIWebViewDelegate> {
    ...
}

@property (strong, nonatomic) UIWebView *webView;

- (IBAction)create:(id)sender;

@end

CreateViewController.h

#import <UIKit/UIKit.h>
#import <Social/Social.h>

@class CreateViewController;

@protocol CreateViewControllerDelegate
    - (void)createViewControllerDidFinish:(CreateViewController *)controller;
@end

@interface CreateViewController : UIViewController <UIWebViewDelegate> {
    ...
}

@property (weak, nonatomic) id <CreateViewControllerDelegate> delegate;

- (IBAction)cancel:(id)sender;
- (IBAction)submit:(id)sender;

@end

DefaultViewController.m

#import "AppDelegate.h"
#import "DefaultViewController.h"

...

@implementation DefaultViewController

...

#pragma mark - CreateViewController

- (void)createViewControllerDidFinish:(CreateViewController *)controller {
    NSLog(@"DefaultViewController: createViewControllerDidFinish");
    [self.navigationController dismissViewControllerAnimated:YES completion:nil];
}

- (IBAction)create:(id)sender {
    CreateViewController *vc2 = [[CreateViewController alloc] init];
    [self.navigationController pushViewController:vc2 animated:YES];
}

@end

CreateViewController.m

#import "AppDelegate.h"
#import "CreateViewController.h"

...

@implementation CreateViewController

...

#pragma mark - Actions

- (IBAction)cancel:(id)sender {
    NSLog(@"CreateViewController: cancel");
    [self.delegate createViewControllerDidFinish:self];
}

- (IBAction)submit:(id)sender {
    [webView stringByEvaluatingJavaScriptFromString:@"EntryCreate.submit();"];
}

@end

【问题讨论】：

标签： ios delegates uinavigationcontroller

【解决方案1】：

使用导航控制器，当您推送视图控制器时，您必须 pop 关闭

- (IBAction)cancel:(id)sender {
    NSLog(@"CreateViewController: cancel");
    [self.navigationController popViewControllerAnimated:YES];
}

不需要控制器实例 Nav Controller 基本上是一个堆栈，当您弹出它时，它会从堆栈顶部移除并移动到上一个视图控制器，从它被推送的位置。

【讨论】：