按下相同的控件时按下 segue，使我的应用程序崩溃

Posted 2023-03-12

【中文标题】按下相同的控件时按下 segue，使我的应用程序崩溃

【英文标题】：Pushing segue when pressing same control, crashes my app

【发布时间】：2014-04-24 15:24:16

【问题描述】：

这里发生了一些奇怪的事情。我有一个tableview，每一行都有一个segmentedcontrol。其含义是，始终只需要选择一个分段控件。单击“控制项”时，会推送一个 segue。

如果我不断选择不同分段控件的项目，则不会发生任何事情，我的代码可以完美运行。当我从同一个分段控件中选择不同的项目时，我有这个错误：

嵌套推送动画可能导致导航栏损坏 在意外状态下完成导航转换。导航栏子视图树可能会损坏。 开始/结束外观转换的不平衡调用。

这是我的代码：

@interface PerformancesController ()

    GFilm* currentFilm;
    GTimePerformance* chosenTimePerf;

@end

@implementation PerformancesController



- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView

    // Return the number of sections.
    return 1;


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


    // Return the number of rows in the section.
return [currentFilm.dayList count];



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

    UITableViewCell *cell = [tableView     dequeueReusableCellWithIdentifier:@"myCustomCell"];
    if (cell == nil) 
        cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:@"myCustomCell"];
    


CAGradientLayer *bgLayer = [BackgroundLayer blackGradient];
bgLayer.frame = cell.bounds;
[cell.contentView.layer addSublayer:bgLayer];
cell.contentView.backgroundColor = [UIColor darkGrayColor];
cell.textLabel.textAlignment = UITextAlignmentLeft;
cell.selectionStyle = UITableViewCellSelectionStyleNone;

if(indexPath.row == 0)

    CGRect rctStreep = cell.bounds;
    rctStreep.origin.y = rctStreep.origin.y+1;
    rctStreep.size.height = 1;
    UIImageView* imgv = [[UIImageView alloc]initWithImage:[UIImage imageNamed:@"streep.png"]];
    imgv.backgroundColor = [UIColor blackColor];
    imgv.frame = rctStreep;
    [cell.contentView addSubview:imgv];




CGRect rctStreep = cell.bounds;
rctStreep.origin.y = rctStreep.origin.y + rctStreep.size.height;
rctStreep.size.height = 1;
UIImageView* imgv = [[UIImageView alloc]initWithImage:[UIImage imageNamed:@"streep.png"]];
imgv.backgroundColor = [UIColor blackColor];
imgv.frame = rctStreep;
[cell.contentView addSubview:imgv];
imgv = nil;

NSArray* dayList = currentFilm.dayList;
GDay* d = (GDay*)[dayList objectAtIndex:indexPath.row];


CGRect rctDayLabel = CGRectMake(15, 7, 80, 30);
UILabel* lblDay = [[UILabel alloc]initWithFrame:rctDayLabel];
lblDay.textColor = [GColor yellowAccentColor];
NSDate* date = d.date;


if([date isToday])

    lblDay.text = @"Vandaag";

else if([date isTomorrow])

    lblDay.text = @"Morgen";

else

    NSDateFormatter *formatter = [[NSDateFormatter alloc] init];
    [formatter setDateFormat:@"dd/MM"];
    lblDay.text = [formatter stringFromDate:date];


[cell.contentView addSubview:lblDay];

NSMutableArray* itemArray = [[NSMutableArray alloc]init];
int i = 0;
GTimePerformance* prevChosen = currentFilm.displayPerformance;
int gekozen = -1;

for(i; i < [d.timeIdList count]; i++)


    GTimePerformance* per = [d.timeIdList objectAtIndex:i];
    if([per.performanceId isEqualToString:prevChosen.performanceId])
    
        gekozen = i;
    

    NSDateFormatter *formatter = [[NSDateFormatter alloc] init];
    [formatter setDateFormat:@"HH:mm"];
    [itemArray addObject:[formatter stringFromDate:per.performanceTime]];




float itemWidth = (cell.frame.size.width - (2* rctDayLabel.origin.x))/4;

MySegmentedControl *segmentedControl = [[MySegmentedControl alloc] initWithItems:itemArray];
segmentedControl.frame = CGRectMake(rctDayLabel.origin.x, cell.frame.size.height - rctDayLabel.origin.y - 30, itemWidth*[d.timeIdList count] , 30);
segmentedControl.segmentedControlStyle = UISegmentedControlStylePlain;
segmentedControl.tintColor = [GColor filterComponentColor];
if(gekozen >= 0)

    [segmentedControl setSelectedSegmentIndex:gekozen];

[segmentedControl addTarget:self
                     action:@selector(clickedPerformance:)
           forControlEvents:UIControlEventValueChanged];
UIFont *font = [UIFont systemFontOfSize:10.0f];
NSDictionary *attributes = [NSDictionary dictionaryWithObject:font
                                                       forKey:NSFontAttributeName];
[segmentedControl setTitleTextAttributes:attributes
                                forState:UIControlStateNormal];
segmentedControl.tag = 200 + indexPath.row;
[cell.contentView addSubview:segmentedControl];

return cell;




-(void)clickedPerformance:(id)sender
 

    UISegmentedControl *segment = (UISegmentedControl*)sender;

   if(segment.selectedSegmentIndex != -1)
   
       int tag = segment.tag;
       int i = 0;
       for(i; i < [currentFilm.dayList count]; i++)
       
           int diffTag = i + 200;
           if(diffTag != tag)
           
               UISegmentedControl* sControl = (UISegmentedControl*)[self.view viewWithTag:diffTag];
           [sControl setSelectedSegmentIndex:UISegmentedControlNoSegment];
       
   

   NSLog(@"lalala");
   GDay* day = (GDay*)[currentFilm.dayList objectAtIndex:tag-200];
   chosenTimePerf = [day.timeIdList objectAtIndex:segment.selectedSegmentIndex];
   NSLog(chosenTimePerf.performanceId);
   [self performSelector:@selector(goSegue) withObject:nil afterDelay:0.35];

  

-(void)goSegue

    [self performSegueWithIdentifier:@"pushPrices" sender:self];



// In a storyboard-based application, you will often want to do a little preparation     before navigation
- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender

     NSString * segueName = segue.identifier;
     if ([segueName isEqualToString: @"pushPrices"]) 
     PricesController* pc = (PricesController*)[segue destinationViewController];
    [pc setMovie:currentFilm andPerformance:chosenTimePerf];





@end

【参考方案1】：

为什么要延迟goSegue 方法？在afterDelay 过去之前多次点击该项目会导致麻烦。

我会改变：

[self performSelector:@selector(goSegue) withObject:nil afterDelay:0.35];

到：

[self goSegue];

【讨论】：

我推迟了它，因为我认为它可以解决问题。因为也许控制还没有完全设置好。也许是一个愚蠢的解释，但我对移动编程相当陌生:)。

@user3484771 我没有看到延迟转场的正当理由，你尝试过我的建议吗

我想我解决了这个问题。当按下同一个控件时，[self goSegue] 会被调用两次。奇怪

是的，我试过了，问题仍然存在，这是我之前没有想到的错误，见上文。