ios - 由于未捕获的异常 'NSInvalidArgumentExceptioneason: ' -[__NSCFDictionary 练习] : unrecognized selector 而终止应用程序

Question

我是 xcode 新手，我遇到了这个问题，当我尝试点击进入 DetailViewcontroller 的单元格并出现错误时，应用程序崩溃并给出此错误:* 由于未捕获的异常而终止应用程序' NSInvalidArgumentException'，原因:'-[__NSCFDictionaryExercise]:无法识别的选择器发送到实例 0x8ca15b0'。我不确定是什么原因。我在这里复制了代码:

MAsterViewcontroller.h

    #import <UIKit/UIKit.h>

@interface MasterViewController : UITableViewController{

    NSMutableArray* routines_;
    NSMutableArray *routineinfo_;
}

@property (nonatomic,retain)NSMutableArray* routines;
@property (nonatomic,retain)NSMutableArray* routineinfo;

@end

文件MasterViewController.m

    #import "MasterViewController.h"

#import "ClassDetailViewController.h"
#import "ClassConstants.h"

@implementation MasterViewController

@synthesize routines=routines_,routineinfo=routineinfo_;


- (void)awakeFromNib
{
[super awakeFromNib];
}


- (void)viewDidLoad

    {
        [super viewDidLoad];
        NSString *path = [[NSBundle mainBundle] pathForResource:@"Mills" ofType:@"plist"];

        routines_= [[NSMutableArray alloc] initWithContentsOfFile:path];

        //Uncomment the following line to displa an Edit button in the navgation bar for this view controller.

        self.navigationItem.leftBarButtonItem = self.editButtonItem;

    }


    - (void)dealloc {
    [routines_ release];
    [routineinfo_ release];
    [super dealloc];
}


- (void)insertNewObject:(id)sender
{
    //    if (!_objects) {
    //        _objects = [[NSMutableArray alloc] init];
    //    }
    //    [_objects insertObject:[NSDate date] atIndex:0];
    //    NSIndexPath *indexPath = [NSIndexPath indexPathForRow:0 inSection:0];
    //    [self.tableView insertRowsAtIndexPaths:@[indexPath] withRowAnimation:UITableViewRowAnimationAutomatic];
}

#pragma mark - Table View

- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
{
    return 1;
}



//Customize the number of rows in the table view.

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section{

    return [self.routines count];

}


//Configure appearence of table view cells.


- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath

{
    static NSString *CellIdentifier = @"Cell";
    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
    if (cell == nil) {
        cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier] autorelease];
    }

    //Configure the cell.
    cell.textLabel.text = [[self.routines objectAtIndex:indexPath.row]
                       objectForKey:NAME_KEY];

    cell.accessoryType = UITableViewCellAccessoryDisclosureIndicator;

    return cell;
}

- (BOOL)tableView:(UITableView *)tableView canEditRowAtIndexPath:(NSIndexPath *)indexPath
{
    // Return NO if you do not want the specified item to be editable.
    return YES;
}

- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender
{
    if ([[segue identifier] isEqualToString:@"showDetail"]) {

        // Get the data given the selected row
        NSIndexPath *indexPath = [self.tableView indexPathForSelectedRow];
        NSInteger IndexSelected=[indexPath row];
        //NSDictionary *routinedata = [self->routines_ objectAtIndex:[indexPath row]];

        // Pass that data on to the DetailViewController
        DetailViewController *detailVC = segue.destinationViewController;


        NSString *pathSelected=@"";;


        switch (IndexSelected)

        {
            case 0:

                pathSelected = [[NSBundle mainBundle] pathForResource:@"Mills0" ofType:@"plist"];

                break;

            case 1:
                 pathSelected = [[NSBundle mainBundle] pathForResource:@"Mills1" ofType:@"plist"];

                break;

            case 2:
                  pathSelected = [[NSBundle mainBundle] pathForResource:@"Mills2" ofType:@"plist"];

                break;

            default:
                break;

        }
         routineinfo_= [[NSMutableArray alloc] initWithContentsOfFile:pathSelected];

        detailVC.routineinfo = self.routineinfo;


    }
}



@end


    #import <UIKit/UIKit.h>
@interface DetailViewController : UITableViewController{

@private
NSMutableArray *routineinfo_;


}
@property (nonatomic, retain)  NSMutableArray *routineinfo;


@end

ClassDetailViewController.h

#import <UIKit/UIKit.h>
@interface DetailViewController : UITableViewController{

@private
NSMutableArray *routineinfo_;


}
@property (nonatomic, retain)  NSMutableArray *routineinfo;


@end

ClassDetailViewController.m文件

    #import "ClassDetailViewController.h"
#import "ClassConstants.h"
#import "MillsDetailsConstant.h"
#import "LesMillsCell.h"

@implementation DetailViewController
@synthesize routineinfo=routineinfo_;



- (void) dealloc {

    [super dealloc];
    [routineinfo_ release];

}

- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
{
   return 1;
}

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section{

    return [self.routineinfo count];

}

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath

{
    static NSString *CellIdentifier = @"LesMillsCell";
    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];


    LesMillsCell *LesMillsCell=self.routineinfo [indexPath.row];


    //Configure the cell EXERCISE
    LesMillsCell.Exercise.text= [[self.routineinfo objectAtIndex:indexPath.row]
                         objectForKey:EXERCISE_KEY];


    //Configure the cell SONG
    LesMillsCell.Title.text= [[self.routineinfo objectAtIndex:indexPath.row]
                         objectForKey:SONG_KEY];

    //Configure the cell ARTIST
    LesMillsCell.Artist.text= [[self.routineinfo objectAtIndex:indexPath.row]
                         objectForKey:ARTIST_KEY];

    //Configure the cell TIME
    LesMillsCell.Artist.text= [[self.routineinfo objectAtIndex:indexPath.row]
                       objectForKey:TIME_KEY];

    cell.accessoryType = UITableViewCellAccessoryDisclosureIndicator;

    return cell;

}

//Configure appearence of table view cells.
- (void) viewWillAppear:(BOOL)animated {
    [super viewWillAppear:animated];


 //setto  la sezione
 //   NSInteger nSection;
 // setto le righe per sezione
 //   NSInteger nRows;
 // nRows= [self.tableView numberOfRowsInSection:1];
    // creo una cella prptotypes per ogni riga della sezione
   // NSIndexPath IndexTableView



   // nRows=self.tableView
}

 @end

子类文件 LesMillsCell.h

#import <UIKit/UIKit.h>

@interface LesMillsCell : UITableViewCell{

@private

// UITableViewCell *lesmillscell_;
UILabel *Exercise_;
UILabel *Title_;
UILabel *Artist_;
UILabel *Time_;
NSMutableArray *routineinfo_;



}


@property (nonatomic, retain) IBOutlet UILabel *Exercise;
@property (nonatomic, retain) IBOutlet UILabel *Title;
@property (nonatomic, retain) IBOutlet UILabel *Artist;
@property (nonatomic, retain) IBOutlet UILabel *Time;





@end

LesMillsCells.m

#import "LesMillsCell.h"
#import "ClassConstants.h"
#import "MillsDetailsConstant.h"

@implementation LesMillsCell

- (id)initWithStyle:(UITableViewCellStyle)style reuseIdentifier:(NSString *)reuseIdentifier
{
    self = [super initWithStyle:style reuseIdentifier:reuseIdentifier];
    if (self) {
        // Initialization code
    }
    return self;
}

- (void)setSelected:(BOOL)selected animated:(BOOL)animated
{
    [super setSelected:selected animated:animated];

    // Configure the view for the selected state
}

@end

谢谢你的帮助!

Answer 1

如果崩溃发生在这一行:

LesMillsCell.Exercise.text= [[self.routineinfo objectAtIndex:indexPath.row] objectForKey:EXERCISE_KEY];

这意味着LesMillsCell不是LesMillsCell类的对象，而是NSDictionary(或__NSCFDictionary)。因此，在该对象上使用Exercise会导致错误，因为字典不支持该方法。错误从这里开始:

LesMillsCell *LesMillsCell=self.routineinfo [indexPath.row];

self.routineinfo [indexPath.row] 返回类型为 id 的对象，因此编译器无法知道该类型实际上是什么类型，因此赋值会在没有警告的情况下进行。

此外，您还以两种不同的方式使用routineinfo。首先你把它当作 LesMillsCell

LesMillsCell *LesMillsCell=self.routineinfo [indexPath.row];

下面的一行将其视为字典，并提取 EXERCISE_KEY 的值:

[[self.routineinfo objectAtIndex:indexPath.row]
                     objectForKey:EXERCISE_KEY];