NSInvalidArgumentException - 无法识别的选择器发送到实例

Posted 2023-03-03

【中文标题】NSInvalidArgumentException - 无法识别的选择器发送到实例

【英文标题】：NSInvalidArgumentException - unrecognized selector sent to instance

【发布时间】：2013-10-22 20:39:17

【问题描述】：

我正在使用以下函数使用 SearchDisplayController 进行搜索

- (void)handleSearchForTerm:(NSString *)searchTerm

[self.searchResults removeAllObjects]; // First clear the filtered array.

FMDatabase *db = [FMDatabase databaseWithPath:[Utility getDatabasePath]];


[db open];


FMResultSet *results = [db executeQuery: [NSString stringWithFormat:@"SELECT * FROM periods where (searchstartyear <= %@)  AND (searchendyear >= %@)", searchTerm, searchTerm]];

    NSMutableArray *array = [[NSMutableArray alloc] init ];
    [array removeAllObjects];
    while ([results next]) 
        Periods *searchPeriod = [[Periods alloc] init];
        searchPeriod.periodname = [results stringForColumn:@"PeriodName"];
        searchPeriod.startyear = [results stringForColumn:@"StartYear"];
        searchPeriod.endyear = [results stringForColumn:@"EndYear"];
        searchPeriod.thumb = [results stringForColumn:@"Thumb"];
        searchPeriod.childid = [results stringForColumn:@"ChildID"];
        [array addObject:searchPeriod];           
    
    [self.searchResults addObject:array];


[db close];    

期间是一个对象

#import <UIKit/UIKit.h>

@interface Periods : NSObject

@property (nonatomic,strong) NSString *periodname;
@property (nonatomic,strong) NSString *startyear;
@property (nonatomic,strong) NSString *endyear;
@property (nonatomic,strong) NSString *thumb; 
@property (nonatomic,strong) NSString *childid;


@end

当执行以下代码时，我得到了 ：

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

    static NSString *CellIdentifier = @"PeriodsCell";

    UITableViewCell *cell = [self.mainTableView dequeueReusableCellWithIdentifier:CellIdentifier];
    if (cell == nil) 
        cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier];
    

    // Configure the cell...

    if (tableView != [[self searchDisplayController] searchResultsTableView])
    

        NSMutableArray *array = [periodsdataarray objectAtIndex:indexPath.section];
        NSMutableDictionary *dictionary = [array objectAtIndex:indexPath.row];




        UILabel *childIDLabel = (UILabel *)[cell viewWithTag:999];
        childIDLabel.text = [dictionary valueForKey:@"ChildID"];
        UILabel *titleLabel = (UILabel *)[cell viewWithTag:100];
        titleLabel.text = [dictionary valueForKey:@"PeriodName"];


        UILabel *previewLabel = (UILabel *)[cell viewWithTag:101];
        previewLabel.text = [NSString stringWithFormat:@"%@ - %@",[dictionary valueForKey:@"StartYear"],[dictionary valueForKey:@"EndYear"]];
        UIImageView *imageview = (UIImageView *)[cell viewWithTag:102];
        [imageview setImage:[UIImage imageNamed:[dictionary valueForKey:@"Thumb"]]];
    
    else
    
        Periods *periodcell = [self.searchResults objectAtIndex:indexPath.row];

        cell.tag = 666;
        UILabel *childIDLabel = (UILabel *)[cell viewWithTag:999];
        childIDLabel.text = periodcell.childid;
        UILabel *titleLabel = (UILabel *)[cell viewWithTag:100];
        titleLabel.text = periodcell.periodname;


        UILabel *previewLabel = (UILabel *)[cell viewWithTag:101];
        previewLabel.text = [NSString stringWithFormat:@"%@ - %@",periodcell.startyear,periodcell.endyear];
        UIImageView *imageview = (UIImageView *)[cell viewWithTag:102];
        [imageview setImage:[UIImage imageNamed:periodcell.thumb]];


    

    return cell;

...更具体地说，当执行此行时：

childIDLabel.text = periodcell.childid;

我做错了什么？

【问题讨论】：

选择器发送到的实例的类是什么？

我很抱歉，但我不确定我是否理解您的问题..

你提到你得到了一个例外。通常异常会提到类名。

感谢您回来。这是异常消息的全文： *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[__NSArrayM childid]: unrecognized selector sent to instance 0xe2b5a70'

感谢您的宝贵时间。我能够找到我的错误......在我的搜索功能中，我将一个数组添加到我的 searchResults 数组而不是我的 Periods 对象，

【参考方案1】：

我犯的错误是在 handleSearchForTerm 函数中。

我使用 NSMutableArray *array 来保存 Periods 对象的值，然后将该数组添加到我的 searchResults 数组中（期望 searchResults 保存 Periods）。解决方案很简单，只需将句点直接添加到我的 searchResults 数组并完全放弃数组......