自定义表视图控制器因“initWithCoder：无法识别的选择器发送到实例”而崩溃

Posted 2023-03-28

【中文标题】自定义表视图控制器因“initWithCoder：无法识别的选择器发送到实例”而崩溃

【英文标题】：Custom Table View Controller crashes with "initWithCoder: unrecognized selector sent to instance"

【发布时间】：2015-07-20 08:27:31

【问题描述】：

基于此处提供的示例代码 (Show Timelines)，我创建了一个自定义 TWTRSearchViewController：

.h:

#import <TwitterKit/TwitterKit.h>
@interface TWTRSearchViewController : TWTRTimelineViewController
@end

.m:

#import "TWTRSearchViewController.h"
@interface TWTRSearchViewController ()
@end

@implementation TWTRSearchViewController
- (instancetype)init 
    TWTRAPIClient *APIClient = [[Twitter sharedInstance] APIClient];
    TWTRSearchTimelineDataSource *searchTimelineDataSource = [[TWTRSearchTimelineDataSource alloc] initWithSearchQuery:@"#twitterflock" APIClient:APIClient];
    return [super initWithDataSource:searchTimelineDataSource];


- (void)viewDidLoad 
    [super viewDidLoad];
    // Do any additional setup after loading the view.

这是 TWTRTimelineViewController.h 的头文件：

//
//  TWTRTimelineViewController.h
//  TwitterKit
//
//  Copyright (c) 2015 Twitter. All rights reserved.
//

#import <UIKit/UIKit.h>
#import "TWTRTimelineDataSource.h"

/**
 This class is a `UITableViewController` subclass that displays `TWTRTweetTableViewCell` cells. It handles cell-reuse, cell-configuration, and loading more tweets from the given timeline once the last cell is reached.

 ## Usage

 Initialize this class with any object that conforms to the `TWTRTimelineDataSource` protocol. We provide two such classes, `TWTRUserTimelineDataSource` and `TWTRSearchTimelineDataSource`. These provide `TWTRTweet` objects to this table view which then configures the instances of `TWTRTweetTableViewCell`.

    // Create the data source
    TWTRAPIClient *client = [Twitter sharedInstance].APIClient;
    TWTRUserTimelineDataSource *dataSource = [[TWTRUserTimelineDataSource alloc] initWithScreenName:@"jack" APIClient:client];

    // Create the timeline view controller
    TWTRTimelineViewController *timeline = [[TWTRTimelineViewController alloc] initWithDataSource:dataSource];

 ## Loading More

 This class loads the first batch of `TWTRTweet` objects from the Twitter API when `viewWillAppear:` is received. It also handles loading more tweets automatically once the last cell has been shown.

 */
@interface TWTRTimelineViewController : UITableViewController

/**
   Initializes a timeline view controller. Does not start loading tweets until 
   `viewWillAppear:` is called. 

   This method must be used to initialize this class. The `init` method is unavailable.

   @param dataSource   Required. A timeline data source object that conforms to the `TWTRTimelineDataSource` protocol.

   @return A fully initialized `TWTRTimelineViewController` or nil if the data source is missing.
 */
- (instancetype)initWithDataSource:(id<TWTRTimelineDataSource>)dataSource __attribute((nonnull)) NS_DESIGNATED_INITIALIZER;

/**
  The source of `TWTRTweet` objects for this `TWTRTimelineViewController`.

  May be set to update the tweets being shown by this table view. Must be set on the main thread.
 */
@property (nonatomic, strong) id<TWTRTimelineDataSource> dataSource;

- (instancetype)initWithStyle:(UITableViewStyle)style __attribute__((unavailable("Use -initWithDataSource: instead")));

- (id)initWithCoder:(NSCoder *)aDecoder __attribute__((unavailable("Use -initWithDataSource: instead")));

- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil __attribute__((unavailable("Use -initWithDataSource: instead")));

@end

应用启动后立即崩溃并显示错误消息：-[TWTRSearchViewController initWithCoder:]: unrecognized selector sent to instance 0x7a88f1d0。应用甚至在调用 init 或 viewDidLoad 之前就崩溃了。

我的代码有什么问题？知道我可能错过了什么吗？

谢谢

【参考方案1】：

在您的子类中覆盖 initWithCoder: 方法并执行与当前 init 中相同的操作

【讨论】：

难道没有比使用情节提要更好的方法来实例化我的视图控制器吗？

【参考方案2】：

我也遇到过类似的错误，但也没有合乎逻辑的解释。即使滑动派生数据等也不起作用。我最终所做的是，创建一个名称中带有“2”的新类以将其与第一个类区分开来，从崩溃的视图控制器中复制代码，然后它就可以工作了。