ios - 无法从呈现的 View Controller 访问委托(delegate)方法
<p><p>委托(delegate)声明</p>
<pre><code>// FolderListViewController.h
#import <UIKit/UIKit.h>
#import "Folder.h"
@protocol FolderSelectionDelegate <NSObject>
@required
- (void)setFolder:(Folder *)folder;
@end
@interface FolderListViewController : UITableViewController
@property (nonatomic, assign) id<FolderSelectionDelegate> delegate;
- (IBAction)showDashboard:(id)sender;
@end
</code></pre>
<p>从 didSelectRowAtIndexPath 调用委托(delegate):</p>
<pre><code>// FolderListViewController.m
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {
];
}
</code></pre>
<p>应该接收消息的 VC</p>
<pre><code>#import <UIKit/UIKit.h>
#import "FolderListViewController.h"
#import "Folder.h"
@interface ProjectListViewController : UITableViewController <FolderSelectionDelegate, UISplitViewControllerDelegate, UISearchBarDelegate, UINavigationControllerDelegate>
@property (nonatomic,retain)UIActivityIndicatorView *activityIndicatorObject;
@property (nonatomic, copy)Folder *folder;
-(void)loadProjects:(Folder*)folder;
@end
</code></pre>
<p>呈现 VC 的 Action </p>
<pre><code>- (void)foldersButtonTapped {
UINavigationController *vc = [ instantiateViewControllerWithIdentifier:@"FolderListNavController"];
vc.delegate = self;
;
}
</code></pre>
<p>委托(delegate)方法实现</p>
<pre><code>- (void)setFolder:(Folder *)folder {
_folder = folder;
;
}
</code></pre>
<p>我已经阅读了这里的多个线程并且没有任何运气。起初,在展示 FolderListVC(即 vc.delegate = self)时,我没有提到 ProjectListVC 设置。不过,这似乎不是问题所在。我正在开发一个为 iPad 构建的应用程序,并将其扩展到所有设备上。此处的实现有效(它设置为 Split View Controller )。任何帮助将不胜感激</p></p>
<br><hr><h1><strong>Best Answer-推荐答案</ strong></h1><br>
<p><p>我认为 UINavigationcontroller 正在制造问题,因为它没有设置 FolderListViewController 委托(delegate)。你可以这样试试吗?</p>
<pre><code> FolderListViewController *vc=;
vc.delegate=self; // protocol listener
;
</code></pre></p>
<p style="font-size: 20px;">关于ios - 无法从呈现的 ViewController 访问委托(delegate)方法,我们在Stack Overflow上找到一个类似的问题:
<a href="https://stackoverflow.com/questions/38769673/" rel="noreferrer noopener nofollow" style="color: red;">
https://stackoverflow.com/questions/38769673/
</a>
</p>
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