在不使用图像的情况下滚动滚动视图时，应用程序崩溃并在 ARC 中收到内存异常

Posted 2023-03-11

【中文标题】在不使用图像的情况下滚动滚动视图时，应用程序崩溃并在 ARC 中收到内存异常

【英文标题】：App crashes with received memory Exception in ARC while scrolling the scrollview with out using images

【发布时间】：2016-01-19 07:03:00

【问题描述】：

我正在使用 UIScrollview 并添加 subView 来显示消息。滚动时会给出received memory exception。我从 15 天起就很难找到这个。请帮我解决这个问题。

为了显示我第一次加载 5 条消息。滚动后根据数组计数添加子视图。如果是子视图，则根据消息长度增加。如果是长消息，则崩溃received memory exception。

这是我的代码

-(void)createView:(float)yAxis

   // NSLog(@"Create view %f",yAxis);
    for (UIView * view in backgroundScroll.subviews) 
        if (view.tag == 15) 
            [view removeFromSuperview];
        
    

    for(int i=0;i<[pageMessageArray count];i++)
    
        UIView *backgrounf_View=[self messageChildElements:yAxis :i];
        [del.msglistViewArray addObject:backgrounf_View];
        UIView *backgrounf_View1= [del.msglistViewArray objectAtIndex:i];

        [backgroundScroll addSubview:backgrounf_View1];

        yAxis=yAxis+oldY_Axis+65;
    



    CGRect contentRect = CGRectZero;
    for (UIView *view in backgroundScroll.subviews)
    
        contentRect = CGRectUnion(contentRect, view.frame);
    

    //UIView *backgrounf_View1= [del.msglistViewArray objectAtIndex:i];

    backgroundScroll.contentSize = CGSizeMake(backgroundScroll.frame.size.width, yAxis-10);

    lblPermenentmessage.frame=CGRectMake(30, contentRect.size.height+20,800, 50);
    //LastMessageYaxis=contentRect.size.height+20;
    lblPermenentmessage.text=@"Messages are displayed for 24-48 hours and automatically deleted permanently.";


-(UIView *)messageChildElements:(float)yAxis :(int)index

   // NSLog(@"Create view %f",yAxis);

    communityObject *objMessage=[del.messageArray objectAtIndex:index];
    UIView *backgrounf_View=nil;
    UITextView *txt_Message=nil;
    UIButton  *btnURL =nil;
    UIButton  *btnAttachment=nil;
    UIButton  *btnDate=nil;
    UIButton  *btnSendBy=nil;

    UIButton  *btnAttachmentName=nil;
    UIButton  *btnSendTo=nil;


    NSString *labelText = objMessage.Message;
    NSMutableAttributedString *attributedString = [[NSMutableAttributedString alloc] initWithString:labelText];
    NSMutableParagraphStyle *paragraphStyle = [[NSMutableParagraphStyle alloc] init];
    [paragraphStyle setLineSpacing:8];
    [attributedString addAttribute:NSParagraphStyleAttributeName value:paragraphStyle range:NSMakeRange(0, [labelText length])];

    CGFloat height=[self getNewsize:objMessage.Message :backgroundScroll.frame.size.width-30];

    backgrounf_View=[[UIView alloc]initWithFrame:CGRectMake(26,yAxis,backgroundScroll.frame.size.width-30,height)];

    if([objMessage.inorout isEqualToString:@"out"])
    
        //ye
        [backgrounf_View setBackgroundColor:[UIColor colorWithRed:251/255.0f green:247/255.0f blue:193/255.0f alpha:1.0f]];
        [[backgrounf_View layer] setBorderWidth:1.0f];
        [[backgrounf_View layer] setBorderColor:[UIColor colorWithRed:236/255.0f green:237/255.0f blue:178/255.0f alpha:1.0f].CGColor]; 
    
    else
    
        //[cell.lblName addTarget:self action:@selector(replayClick:) forControlEvents:UIControlEventTouchUpInside];
        [backgrounf_View setBackgroundColor:[UIColor colorWithRed:251/255.0f green:215/255.0f blue:245/255.0f alpha:1.0f]];
        [[backgrounf_View layer] setBorderWidth:1.0f];
        [[backgrounf_View layer] setBorderColor:[UIColor colorWithRed:226/255.0f green:188/255.0f blue:218/255.0f alpha:1.0f].CGColor];
    


    // backgrounf_View.autoresizingMask=UIViewAutoresizingFlexibleWidth;
    backgrounf_View.layer.cornerRadius=10;
    //backgrounf_View.tag=15;
    backgrounf_View.clipsToBounds=YES;
    backgrounf_View.tag=objMessage.indexValue;

    txt_Message = [[UITextView alloc] initWithFrame:CGRectMake(12, 6, backgroundScroll.frame.size.width-40, height)];
    txt_Message.backgroundColor=[UIColor redColor];
    [txt_Message setScrollEnabled:NO];
    [txt_Message setUserInteractionEnabled:NO];
    [txt_Message setBackgroundColor:[UIColor clearColor]];

    //txt_Message.autoresizingMask=UIViewAutoresizingFlexibleWidth;

    txt_Message.attributedText=attributedString;

    //[txt_Message sizeToFit];

    if([del.device isEqualToString:@"iphone"])
    
        [txt_Message  setFont:[UIFont fontWithName:@"Arial" size:17]];
    
    else
    
        [txt_Message  setFont:[UIFont fontWithName:@"Arial" size:21]];
    

    [backgrounf_View addSubview:txt_Message];
    oldY_Axis=height+20;

    if (objMessage.Link.length>0)
    
        btnURL = [UIButton buttonWithType:UIButtonTypeRoundedRect];
        btnURL.frame = CGRectMake(11,height,backgroundScroll.frame.size.width-100,40);
        [btnURL setTitle:objMessage.Link  forState:UIControlStateNormal];
        btnURL.contentHorizontalAlignment = UIControlContentHorizontalAlignmentLeft;
        btnURL.contentVerticalAlignment = UIControlContentVerticalAlignmentTop;
        // btnURL.backgroundColor=[UIColor redColor];
        btnURL.tag=objMessage.indexValue;
        btnURL.titleLabel.lineBreakMode=UILineBreakModeCharacterWrap;
        btnURL.titleLabel.numberOfLines=2;
        btnURL.titleLabel.font=[UIFont fontWithName:@"Arial" size:20];
        btnURL.contentEdgeInsets = UIEdgeInsetsMake(0, 0, 0, 0);
        [btnURL setTitleColor:[UIColor blackColor] forState:UIControlStateNormal];
        [backgrounf_View addSubview:btnURL];

        oldY_Axis=height+btnURL.frame.size.height+20; 
    

    if (objMessage.Filename.length>0)
    
        btnAttachment= [UIButton buttonWithType:UIButtonTypeRoundedRect];
        btnAttachment.frame = CGRectMake(11, oldY_Axis,40, 40);
        btnAttachment.tag=objMessage.indexValue;

        UIImage *buttonattachment=[UIImage imageNamed:@"attach.png"];
        [btnAttachment setBackgroundImage:buttonattachment forState:UIControlStateNormal];
        btnAttachment.userInteractionEnabled=YES;

        btnAttachmentName = [UIButton buttonWithType:UIButtonTypeRoundedRect];
        btnAttachmentName.frame = CGRectMake(47,oldY_Axis+5,backgroundScroll.frame.size.width-150,60);
        [btnAttachmentName setTitle:objMessage.Filename  forState:UIControlStateNormal];
        btnAttachmentName.contentHorizontalAlignment = UIControlContentHorizontalAlignmentLeft;
        btnAttachmentName.contentVerticalAlignment = UIControlContentVerticalAlignmentTop;
        btnAttachmentName.tag=objMessage.indexValue;


        btnAttachmentName.titleLabel.font=[UIFont fontWithName:@"Arial" size:20];
        btnAttachmentName.contentEdgeInsets = UIEdgeInsetsMake(0, 0, 0, 0);
        [btnAttachmentName setTitleColor:[UIColor blackColor] forState:UIControlStateNormal];
        [backgrounf_View addSubview:btnAttachment];
        [backgrounf_View addSubview:btnAttachmentName];

        oldY_Axis=oldY_Axis+btnAttachment.frame.size.height+30;
    

    btnDate = [UIButton buttonWithType:UIButtonTypeRoundedRect];
    btnDate.frame = CGRectMake(11,oldY_Axis,130,30);
    [btnDate setTitle:[NSString stringWithFormat:@"%@:",objMessage.Date]  forState:UIControlStateNormal];
    btnDate.contentHorizontalAlignment = UIControlContentHorizontalAlignmentLeft;
    btnDate.contentVerticalAlignment = UIControlContentVerticalAlignmentTop;
    btnDate.tag=objMessage.indexValue;
    btnDate.titleLabel.font=[UIFont fontWithName:@"Arial" size:15];
    btnDate.contentEdgeInsets = UIEdgeInsetsMake(0, 0, 0, 0);
    [btnDate setTitleColor:[UIColor colorWithRed:70/255.0f green:70/255.0f blue:70/255.0f alpha:1.0f] forState:UIControlStateNormal];
    [backgrounf_View addSubview:btnDate];

    btnSendBy = [UIButton buttonWithType:UIButtonTypeRoundedRect];
    btnSendBy.frame = CGRectMake(127,oldY_Axis,backgroundScroll.frame.size.width-50,200);
    [btnSendBy setTitle:objMessage.senderPerson  forState:UIControlStateNormal];
    btnSendBy.contentHorizontalAlignment = UIControlContentHorizontalAlignmentLeft;
    btnSendBy.contentVerticalAlignment = UIControlContentVerticalAlignmentTop;
    btnSendBy.tag=objMessage.indexValue;

    // btnURL.backgroundColor=[UIColor redColor];
    //btnSendBy.titleLabel.lineBreakMode=UILineBreakModeCharacterWrap;
    btnSendBy.titleLabel.font=[UIFont fontWithName:@"Arial" size:15];
    btnSendBy.contentEdgeInsets = UIEdgeInsetsMake(0, 0, 0, 0);
    [btnSendBy setTitleColor:[UIColor colorWithRed:70/255.0f green:70/255.0f blue:70/255.0f alpha:1.0f] forState:UIControlStateNormal];
    [backgrounf_View addSubview:btnSendBy];

    btnSendTo = [UIButton buttonWithType:UIButtonTypeRoundedRect];
    btnSendTo.frame = CGRectMake(11,oldY_Axis+25,backgroundScroll.frame.size.width-50,200);
    [btnSendTo setTitle:objMessage.senderPerson  forState:UIControlStateNormal];
    btnSendTo.contentHorizontalAlignment = UIControlContentHorizontalAlignmentLeft;
    btnSendTo.contentVerticalAlignment = UIControlContentVerticalAlignmentTop;
    // btnURL.backgroundColor=[UIColor redColor];
    //btnSendBy.titleLabel.lineBreakMode=UILineBreakModeCharacterWrap;
    btnSendTo.titleLabel.font=[UIFont fontWithName:@"Arial" size:15];
    btnSendTo.contentEdgeInsets = UIEdgeInsetsMake(0, 0, 0, 0);
    [btnSendTo setTitleColor:[UIColor colorWithRed:70/255.0f green:70/255.0f blue:70/255.0f alpha:1.0f] forState:UIControlStateNormal];
    [backgrounf_View addSubview:btnSendTo];


    NSString *communityName=@"";

    if([del.communityId isEqualToString:@"none"])
    
        communityName=objMessage.Community;            
        communityName=[NSString stringWithFormat:@"%@: ",objMessage.Community];
    

    //NSLog(@"Group type %@ and %@",objMessage.groupType,del.communityId);
    if([objMessage.groupType isEqualToString:@"Personal"])
            
        [btnSendTo setTitle:[NSString stringWithFormat:@"%@%@",communityName,objMessage.Person] forState: UIControlStateNormal];        
    
    else if([objMessage.groupType isEqualToString:@"Everyone"])
            
        [btnSendTo setTitle:[NSString stringWithFormat:@"%@%@",communityName,@"Everyone"] forState: UIControlStateNormal];     
    
    else
            
        [btnSendTo setTitle:[NSString stringWithFormat:@"%@%@",communityName,objMessage.GroupName] forState: UIControlStateNormal];       
    


    [btnURL addTarget:self action:@selector(getLink:) forControlEvents:UIControlEventTouchUpInside];
    [btnAttachmentName addTarget:self action:@selector(fileDowload:) forControlEvents:UIControlEventTouchUpInside];
    [btnAttachment addTarget:self action:@selector(fileDowload:) forControlEvents:UIControlEventTouchUpInside];

    backgrounf_View.frame=CGRectMake(24,yAxis,backgroundScroll.frame.size.width-30,oldY_Axis+55);
    LastMessageYaxis=backgrounf_View.frame.origin.y+backgrounf_View.frame.size.height+10;

    del.RefreshValue=0;
    LastValue=index;

    communityObject *com=[[communityObject alloc]init];
    com.MessageId=nil;
    com.Date=nil;
    com.Message=nil;
    com.Link=nil;
    com.Attachment=nil;
    com.Filename=nil;
    com.attachmentType=nil;
    com.imageSize=nil;
    com.groupType=nil;
    com.Person=nil;
    com.GroupName=nil;   
    com.senderPerson=nil;
    com.Community=nil;
    com.inorout=nil;

    return backgrounf_View;     

Sceenshot is added please check.

【问题讨论】：

也许你应该使用 UITableView 并从它的视图回收功能中受益。

您是否使用Instruments - 分配/僵尸工具对您的应用进行了分析？这可能会为您提供有关应用程序内存使用情况的线索。

@jorn Buitink 我之前使用的是 UItableview，但计算高度需要时间。它不符合我的要求，所以我删除了它。我正在实现这个用户界面

@Cristik 是的，我正在使用仪器我只获得内存地址如何使用内存地址找到代码。请帮我找到。

我已添加截图请检查并帮助我

【参考方案1】：

这个位在枚举时看起来像是数组的突变：

  for (UIView * view in backgroundScroll.subviews) 
        if (view.tag == 15) 
            [view removeFromSuperview];
        
    

难怪数组不喜欢它。我也会崩溃:)

顺便说一句：在视图标签中存储数组索引的那部分似乎非常错误。

【讨论】：

如果删除我也得到同样的错误。虽然快速滚动应用程序因收到内存异常而崩溃

是的。有可能的。我需要通过代码。但是在处理带有标签 15 的视图时，这部分代码肯定会崩溃。我建议将一些 NSAsserts 放在关键部分。尤其是那些使用索引访问数组的地方。找出问题所在应该不难。