ios - 添加目标 :action:forControlEvents: unrecognized selector sent to instance - uibutton in uitablecell

Question

* 编辑:抱歉，刚刚意识到 - 这段代码工作正常，直到我将表格分为三个部分。当它是带有节标题的单个节时，滚动时一切正常。现在我有三个部分，它在滚动时崩溃。*

我正在向 uitablecell 添加一个按钮。当表格内容超出表格高度并且表格滚动到最底部时发生崩溃。

从错误来看，好像没有创建 UIButton，它会报告回 JobsCell...

自定义 UITableCell 中的布局也出错了。看起来 JobsCell 类没有为需要重用并显示回屏幕的单元启动？

    2014-03-20 15:20:32.080 myApp[52350:60b] mapBtn: <UIButton: 0xa89aff0; frame = (0 0; 59 59); opaque = NO; autoresize = RM+BM; tag = 12; layer = <CALayer: 0xa89b1a0>> 2 1
    2014-03-20 15:20:32.313 myApp[52350:60b] mapBtn: <UIButton: 0xa460620; frame = (0 0; 59 59); opaque = NO; autoresize = RM+BM; tag = 12; layer = <CALayer: 0xa469b60>> 0 11
    2014-03-20 15:20:33.512 myApp[52350:60b] mapBtn: <JobsCell: 0xa761ac0; baseClass = UITableViewCell; frame = (0 775; 320 60); autoresize = W; tag = 12; layer = <CALayer: 0xa761e20>> 0 12
2014-03-20 15:20:33.512 myApp[52350:60b] -[JobsCell addTarget:action:forControlEvents:]: unrecognized selector sent to instance 0xa761ac0
2014-03-20 15:20:33.514 myApp[52350:60b] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[JobsCell addTarget:action:forControlEvents:]: unrecognized selector sent to instance 0xa761ac0'
*** First throw call stack:
(
    0   CoreFoundation                      0x024461e4 __exceptionPreprocess + 180
    1   libobjc.A.dylib                     0x020178e5 objc_exception_throw + 44
    2   CoreFoundation                      0x024e3243 -[NSObject(NSObject) doesNotRecognizeSelector:] + 275
    3   CoreFoundation                      0x0243650b ___forwarding___ + 1019
    4   CoreFoundation                      0x024360ee _CF_forwarding_prep_0 + 14
    5   ESC GasCert                         0x0014a109 -[Home_IPVC tableView:cellForRowAtIndexPath:] + 2873
    6   UIKit                               0x00a5d11f -[UITableView _createPreparedCellForGlobalRow:withIndexPath:] + 412
    7   UIKit                               0x00a5d1f3 -[UITableView _createPreparedCellForGlobalRow:] + 69
    8   UIKit                               0x00a3ede7 -[UITableView _updateVisibleCellsNow:] + 2197
    9   UIKit                               0x00a536a5 -[UITableView layoutSubviews] + 213
    10  UIKit                               0x009d3964 -[UIView(CALayerDelegate) layoutSublayersOfLayer:] + 355
    11  libobjc.A.dylib                     0x0202982b -[NSObject performSelector:withObject:] + 70
    12  QuartzCore                          0x0429445a -[CALayer layoutSublayers] + 148
    13  QuartzCore                          0x04288244 _ZN2CA5Layer16layout_if_neededEPNS_11TransactionE + 380
    14  QuartzCore                          0x042880b0 _ZN2CA5Layer28layout_and_display_if_neededEPNS_11TransactionE + 26
    15  QuartzCore                          0x041ee7fa _ZN2CA7Context18commit_transactionEPNS_11TransactionE + 294
    16  QuartzCore                          0x041efb85 _ZN2CA11Transaction6commitEv + 393
    17  QuartzCore                          0x042bccc6 _ZN2CA7Display11DisplayLink14dispatch_itemsEyyy + 474
    18  QuartzCore                          0x042bd147 _ZN2CA7Display16TimerDisplayLink8callbackEP16__CFRunLoopTimerPv + 123
    19  CoreFoundation                      0x02404ac6 __CFRUNLOOP_IS_CALLING_OUT_TO_A_TIMER_CALLBACK_FUNCTION__ + 22
    20  CoreFoundation                      0x024044ad __CFRunLoopDoTimer + 1181
    21  CoreFoundation                      0x023ec538 __CFRunLoopRun + 1816
    22  CoreFoundation                      0x023eb9d3 CFRunLoopRunSpecific + 467
    23  CoreFoundation                      0x023eb7eb CFRunLoopRunInMode + 123
    24  GraphicsServices                    0x036585ee GSEventRunModal + 192
    25  GraphicsServices                    0x0365842b GSEventRun + 104
    26  UIKit                               0x00964f9b UIApplicationMain + 1225
    27  ESC GasCert                         0x0001626d main + 141
    28  ESC GasCert                         0x00002865 start + 53
)
libc++abi.dylib: terminating with uncaught exception of type NSException

但两个类中的代码相同(除了行转换单元格清除)。

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
    static NSString *CellIdentifier = @"JobCell";

    UITableViewCell *cell;
    NSArray *versionCompatibility = [[UIDevice currentDevice].systemVersion componentsSeparatedByString:@"."];

    if ( 6 <= [[versionCompatibility objectAtIndex:0] intValue] )
    {
        // iOS6 is installed
        cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier forIndexPath:indexPath];
    }
    else
    {
        // iOS5 is installed
        cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier ];
    }

    // * ios7 table fix
    [cell setBackgroundColor:[UIColor clearColor]];


    Job *job = 0;
    int jobsaved = 0;
    NSString *jobString = @"";
    NSString *jobPostcode = @"";
    NSString *jobDate = @"";

    // Configure the cell...
    if (indexPath.section==0)
    {
        job = [self.jobs objectAtIndex:indexPath.row];
        jobsaved = job.jobSaved;
        jobString = job.jobAddress;
        jobPostcode = job.jobPostcode;
        jobDate = job.jobDate;
    }
    else if (indexPath.section==1)
    {
        job = [self.jobsCommercial objectAtIndex:indexPath.row];
        jobsaved = job.jobSaved;
        jobString = job.jobAddress;
        jobPostcode = job.jobPostcode;
        jobDate = job.jobDate;
    }
    else if (indexPath.section==2)
    {
        Service *service = [self.jobsServices objectAtIndex:indexPath.row];
        jobsaved = service.jobSaved;
        jobString = service.jobAddress;
        jobPostcode = service.jobPostcode;
        jobDate = service.jobDate;
    }

    UIColor *redcol = [UIColor colorWithRed:0.62745098039216 green:0.15294117647059 blue:0.15686274509804 alpha:1.0];

    jobString = [jobString stringByAppendingString:@", "];
    jobString = [jobString stringByAppendingString:jobPostcode];

    //cell.textLabel.text = jobString;

    UILabel *jobLabel = (UILabel *)[cell viewWithTag:10];
    jobLabel.text = jobString;


    if (jobsaved == 1)
    {
        jobLabel.textColor = redcol;
    }
    else
    {
        jobLabel.textColor = [UIColor blackColor];
    }

    UILabel *dateLabel = (UILabel *)[cell viewWithTag:11];

    if (! [jobDate isEqualToString:@""]) {

        NSDateFormatter *formater = [[NSDateFormatter alloc] init];
        [formater setDateFormat:@"yyyy-MM-dd"];

        NSDate *date2 = [formater dateFromString:jobDate];
        [formater setDateFormat:@"d MMM YYYY"];

        NSString *date = [formater stringFromDate:date2];

        dateLabel.text = date;

    }
    else
    {
        dateLabel.text = @"";
    }

    UIButton *mapBtn = (UIButton *)[cell viewWithTag:12];
    NSLog(@"mapBtn: %@ %d %d",mapBtn, indexPath.section, indexPath.row);
    [mapBtn addTarget:self action:@selector(showMap:) forControlEvents:UIControlEventTouchUpInside];
    cell.tag = indexPath.row;

    return cell;
}

JobsCell.h

#import <UIKit/UIKit.h>

@interface JobsCell : UITableViewCell

@property (nonatomic, strong) IBOutlet UILabel *jobLabel;
@property (nonatomic, strong) IBOutlet UILabel *dateLabel;
@property (nonatomic, strong) IBOutlet UIButton *mapBtn;

@end

JobsCell.m

#import "JobsCell.h"

@implementation JobsCell

@synthesize jobLabel;

- (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

Answer 1

从您的日志中我们可以看到 tag = 12; 有 JobsCell 对象而不是 UIButton

 mapBtn: <JobsCell: 0xa761ac0; baseClass = UITableViewCell; frame = (0 775; 320 60); autoresize = W; **tag = 12;** layer = <CALayer: 0xa761e20>> 0 12

这一行的问题来源 cell.tag = indexPath.row; 因为它也可以是 12