ios – dismissViewControllerAnimated不会释放viewcontroller

分类：iOS作者：编程之家用户
首先：我的项目是ARC启用,我正在使用故事板.

我有一个视图控制器推动segue(模态),

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

在那里我设置一些参数并存储它们.当参数存储(真的一个按钮点击)时,应用程序应该返回原来的viewcontroller.

这个我在做这个命令：

[self.presentingViewController dismissViewControllerAnimated:NO completion:^{}];

我注意到我忽视的视图控制器,永远不会释放.这怎么来的？

我在下面添加“显示的视图控制器”的代码：

@interface CenterChoiceController ()
{
    UIView* _titleBackground;
    UILabel* _lblTitle;
    UIButton* _btnGaVerder;
    UIPickerView* _myPickerView;

    NSArray* _centers;
    UILabel* _adresLine;
    UILabel* _cityLine;
    MKPointAnnotation* _point;
    MKMapView* _mapView;
    UIActivityIndicatorView* _indicator;
    UIAlertView* _alert;
    GCenter* _center;
    DataManager* _dm;
}
@end

@implementation CenterChoiceController


-(void)dealloc
{
    NSLog(@"Centerchoice deallocs");

    _titleBackground = nil;
    _lblTitle = nil;
    _btnGaVerder = nil;
    _myPickerView = nil;
    _point = nil;
    _mapView = nil;
    _indicator = nil;
    _alert = nil;
    _centers = nil;
    _adresLine = nil;
    _cityLine = nil;
    _center = nil;
    _dm = nil;
}

- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
    self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
    if (self) {
        // Custom initialization
    }
    return self;
}

- (void)viewDidLoad
{
    [super viewDidLoad];

    _dm = [[DataManager alloc]init];
    if([_dm hasConnectivity])
    {
        [_dm fetchCentersForController:self];
    }
    else
    {
        [self pushErrorMessage:NSLocalizedString(@"nointernetconnection",nil)];
    }
    CAGradientLayer *bgLayer = [BackgroundLayer blueGradient];
    bgLayer.frame = self.view.bounds;
    [self.view.layer insertSublayer:bgLayer atIndex:0];

    _titleBackground = [[UIView alloc]initWithFrame:CGRectMake(0,self.view.frame.size.width,44)];
    _titleBackground.backgroundColor = [GColor blueColor];
    [self.view addSubview:_titleBackground];

    _lblTitle = [[UILabel alloc]initWithFrame:CGRectMake(0,self.view.frame.size.width - 10,44)];
    _lblTitle.textAlignment = NSTextAlignmentRight;
    _lblTitle.textColor = [GColor whiteColor];
    _lblTitle.text = NSLocalizedString(@"bioscoopkeuze",nil);
    [self.view addSubview:_lblTitle];


    _btnGaVerder = [[UIButton alloc]initWithFrame:CGRectMake(0,self.view.frame.size.height - 54,54)];
    [_btnGaVerder setTitle:NSLocalizedString(@"gaverder",nil) forState:UIControlStateNormal];
    _btnGaVerder.titleLabel.font = [_btnGaVerder.titleLabel.font fontWithSize:12];
    _btnGaVerder.backgroundColor = [GColor blueColor];
    [_btnGaVerder setTitleColor:[GColor whiteColor] forState:UIControlStateNormal];
    [_btnGaVerder setShowsTouchWhenHighlighted:YES];
    [_btnGaVerder addTarget:self action:@selector(gaVerder) forControlEvents:UIControlEventTouchUpInside];

    _myPickerView = [[UIPickerView alloc]initWithFrame:CGRectMake(0,44,200)];



}

-(void)showLoading
{
    NSLog(@"shows loading");
    _indicator = [[UIActivityIndicatorView alloc] initWithActivityIndicatorStyle:UIActivityIndicatorViewStyleGray];
    CGPoint cntr = self.view.center;
    _indicator.center = cntr;
    [_indicator startAnimating];
    [self.view addSubview:_indicator];


}


-(void)hideLoading
{
    NSLog(@"hides loading");
    [_indicator removeFromSuperview];
    _indicator = nil;

}

-(void)pushData:(NSArray *)data
{
    [self.view addSubview:_btnGaVerder];
    [self.view addSubview:_myPickerView];
    _centers = data;
    _myPickerView.delegate = self;
    _myPickerView.dataSource = self;


    _dm = [[DataManager alloc]init];
    GSettings* settings = [_dm loadSettings];

    if(settings == nil)
    {
        settings = [[GSettings alloc]init];
        settings.chosenCenter = [_centers objectAtIndex:0];
        settings.loadedCenter = [_centers objectAtIndex:0];
        _center = settings.chosenCenter;
        settings.notificationsEnabled = YES;
        [self changeAddressLines];
    }

    /*if(settings != nil)
     {
     GCenter* loaded = settings.loadedCenter;

     int i = 0;
     BOOL found = NO;

     while(i < [_centers count] && !found)
     {
     GCenter* center = (GCenter*)[_centers objectAtIndex:i];
     if(settings.loadedCenter.iD == center.iD)
     {
     _center = center;
     settings.chosenCenter = center;
     [_dm storeSettings:settings];
     found = YES;
     }

     i++;
     }
     //[self.myPickerView selectRow:i-1 inComponent:0 animated:NO];

     loaded = nil;
     [self changeAddressLines];

     }
     */
}

-(void) pushErrorMessage: (NSString*) errorMessage
{
    _alert = [[UIAlertView alloc] initWithTitle:NSLocalizedString(@"fout",nil) message:errorMessage delegate:self cancelButtonTitle:@"Ok" otherButtonTitles:nil];
    _alert.delegate = self;
    [_alert show];

}

- (void)alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex
{
    if(buttonIndex == 0)
    {
        if(self.navigationController != nil)
        {
            [self.navigationController popViewControllerAnimated:YES];
        }
        else
        {
            //[self initializeData];
        }


    }

}

- (void)didReceiveMemoryWarning
{
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}



-(void)viewWillDisappear:(BOOL)animated
{
    [_dm cancelCenterRequest];
    /*if(self.tabBarController != nil)
     {
     dm = [[DataManager alloc]init];
     settings = [dm loadSettings];

     if([dm hasConnectivity])
     {
     settings.lastUpdated = nil;
     [dm storeSettings:settings];

     }

     if(settings.loadedCenter.centerCode != settings.chosenCenter.centerCode)
     {
     UIStoryboard *mystoryboard = [UIStoryboard storyboardWithName:@"Main" bundle:nil];
     SplashScreenController *controller =  [mystoryboard instantiateViewControllerWithIdentifier:@"root"];
     [self presentViewController:controller animated:YES completion:nil];
     }


     dm = nil;
     settings = nil;

     }
     */
}

-(void)gaVerder
{


    _dm = [[DataManager alloc]init];
    GSettings* settings = [_dm loadSettings];

    if(settings == nil)
    {
        settings = [[GSettings alloc]init];
        settings.notificationsEnabled = YES;
    }
    if(_center != nil)
    {
        settings.chosenCenter = _center;
    }
    [_dm storeSettings:settings];
    [_mapView removeFromSuperview];
    _mapView = nil;
    _titleBackground = nil;
    _lblTitle = nil;
    _btnGaVerder = nil;
    _myPickerView = nil;
    _point = nil;
    _indicator = nil;
    _alert = nil;
    _centers = nil;
    _adresLine = nil;
    _cityLine = nil;
    _center = nil;
    _dm = nil;


    [self.presentingViewController dismissViewControllerAnimated:NO completion:^{}];
    //DEZE BLIJFT HELAAS IN HET GEHEUGEN HANGEN... GEEN OPLOSSING GEVONDEN

    //[self.navigationController popViewControllerAnimated:NO];
}

//PICKERVIEWDELEGATE EN DATASOURCE

// returns the number of 'columns' to display.
- (NSInteger)numberOfComponentsInPickerView:(UIPickerView *)pickerView
{
    return 1;
}

// returns the # of rows in each component..
- (NSInteger)pickerView:(UIPickerView *)pickerView numberOfRowsInComponent:(NSInteger)component
{
    return [_centers count];
}

- (UILabel *)pickerView:(UIPickerView *)pickerView viewForRow:(NSInteger)row forComponent:(NSInteger)component reusingView:(UIView *)view
{
    GCenter* center = (GCenter*)[_centers objectAtIndex:row];
    NSString* string = center.name;
    UILabel *label = [[UILabel alloc] initWithFrame:CGRectMake(0,pickerView.frame.size.width,44)];
    label.textColor = [GColor blueColor];
    label.font = [label.font fontWithSize:18];
    label.text = string;
    label.textAlignment = NSTextAlignmentCenter;
    return label;

}

- (void)pickerView:(UIPickerView *)pickerView didSelectRow:(NSInteger)row inComponent:(NSInteger)component
{
    _center = (GCenter*)[_centers objectAtIndex:row];

    [self changeAddressLines];

}


-(void)changeAddressLines
{
    if (_mapView != nil)
    {
        [_mapView removeAnnotation:_point];
    }

    [_adresLine removeFromSuperview];
    [_cityLine removeFromSuperview];
    _adresLine = nil;
    _cityLine = nil;



    CGRect rctAdres = CGRectMake(0,_myPickerView.frame.origin.y + _myPickerView.frame.size.height -10,20);
    _adresLine = [[UILabel alloc]initWithFrame:rctAdres];
    _adresLine.textAlignment = NSTextAlignmentCenter;
    _adresLine.textColor = [GColor greyColor];
    _adresLine.text = _center.street;

    CGRect rctCity = CGRectMake(0,rctAdres.origin.y + rctAdres.size.height,20);
    _cityLine = [[UILabel alloc]initWithFrame:rctCity];
    _cityLine.textAlignment = NSTextAlignmentCenter;
    _cityLine.textColor = [GColor greyColor];
    _cityLine.font = [_cityLine.font fontWithSize:14];
    _cityLine.text = _center.city;
    [self.view addSubview:_adresLine];
    [self.view addSubview:_cityLine];

    if(_mapView == nil)
    {

        double height;

        height = _btnGaVerder.frame.origin.y - _cityLine.frame.origin.y - _cityLine.frame.size.height;


        CGRect mapRect = CGRectMake(0,_cityLine.frame.origin.y+3 + _cityLine.frame.size.height,height);
        _mapView = [[MKMapView alloc]initWithFrame:mapRect];
        [self.view addSubview:_mapView];
    }

    CLLocationCoordinate2D punt;
    punt.latitude = _center.latitude;
    punt.longitude =  _center.longitude;
    _point = [[MKPointAnnotation alloc] init];
    [_point setCoordinate:punt];
    _mapView.centerCoordinate = punt;
    _point.title = _center.name;
    [_mapView addAnnotation:_point];
    [_mapView setCenterCoordinate:punt animated:YES];
    MKCoordinateRegion theRegion = _mapView.region;
    theRegion.span.longitudeDelta = 0.005;
    theRegion.span.latitudeDelta = 0.005;
    [_mapView setRegion:theRegion animated:YES];



}




@end

解决方法

如果您的视图控制器在被忽略后未被释放,那么在您的代码中可能有很强的参考控制权. ARC将永远释放没有强引用的对象.

版权声明：本文内容由互联网用户自发贡献，该文观点与技术仅代表作者本人。本站仅提供信息存储空间服务，不拥有所有权，不承担相关法律责任。如发现本站有涉嫌侵权/违法违规的内容， 请发送邮件至 dio@foxmail.com 举报，一经查实，本站将立刻删除。

相关推荐

10个常见的苹果iOS16问题及解决方法
当我们远离最新的 iOS 16 更新版本时，我们听到了困扰 Apple 最新软件的错误和性能问题。
怎么激活苹果手机？苹果手机激活步骤详解
欧版/美版 特别说一下，美版选错了 可能会永久丧失4G，不过只有5%的概率会遇到选择运营商界面且部分必须连接到iTunes才可以激活
借助辅助工具appuploader iOS应用上架流程
一般在接外包的时候, 通常第三方需要安装你的app进行测试(这时候你的app肯定是还没传到app store之前)。
Flutter中实现整个App变为灰色
前言为了让更多的人永远记住12月13日，各大厂都在这一天将应用变灰了。那么接下来我们看一下Flutter是如何实现的。Flutter中实现整个App变为灰色在Flutter中实现整个App变为灰色是非常简单的，只需要在最外层的控件上包裹ColorFiltered，用法如下：ColorFiltered（颜色过滤器）看名字就知道是增加颜色滤镜效果的，ColorFiltered( colorFilter:ColorFilter.mode(Colors.grey, BlendMode.
【Cocos creator】Cocos creator介绍和入门
Cocos creator介绍和入门
Vue3使用axios的配置教程详解
vue3.0 axios封装
flutter升级/版本切换
flutter升级/版本切换
【C++入门】文件流fstream介绍和使用
(1)在C++11标准时，open函数的文件路径可以传char指针也可以传string指针，而在C++98标准，open函数的文件路径只能传char指针；(2)open函数的第二个参数是打开文件的模式，从函数定义可以看出，如果调用open函数时省略mode模式参数，则默认按照可读可写(ios_base:in | ios_base::out)的方式打开；(3)打开文件时的mode的模式是从内存的角度来定义的，比如：in表示可读，就是从文件读数据往内存读写；out表示可写，就是把内存数据写到文件中；
iOS App页面置灰
文章目录方法一：分别将图片和文字置灰UIImage转成灰度图UIColor转成灰度颜色方法二：给App整体添加灰色滤镜参考App页面置灰，本质是将彩色图像转换为灰度图像，本文提供两种方法实现，一种是App整体置灰，一种是单个页面置灰，可结合具体的业务场景使用。方法一：分别将图片和文字置灰一般情况下，App页面的颜色深度是24bit，也就是RGB各8bit；如果算上Alpha通道的话就是32bit，RGBA(或者ARGB)各8bit。灰度图像的颜色深度是8bit，这8bit表示的颜色不是彩色，而是256
iOS黑(灰)白化实现方案---记录
领导让调研下黑(灰)白化实现方案，自己调研了两天，根据网上资料，做下记录只是学习过程中的记录，还是写作者牛逼
让学前端不再害怕英语单词二
让学前端不再害怕英语单词（二），通过本文，可以对css，js和es6的单词进行了在逻辑上和联想上的记忆，让初学者更快的上手前端代码
电视剧里的代码真能运行吗？
用Python送你一颗跳动的爱心
在uni-app的app项目中使用live-pusher实现人脸识别
在uni-app项目中实现人脸识别，既使用uni-app中的live-pusher开启摄像头，创建直播推流。通过快照截取和压缩图片，以base64格式发往后端。
vue支付项目-APP微信支付功能
商户APP调用微信提供的SDK调用微信支付模块，商户APP会跳转到微信中完成支付，支付完后跳回到商户APP内，最后展示支付结果。CSDN前端领域优质创作者，资深前端开发工程师，专注前端开发，在CSDN总结工作中遇到的问题或者问题解决方法以及对新技术的分享，欢迎咨询交流，共同学习。），验证通过打开选择支付方式弹窗页面，选择微信支付或者支付宝支付；4.可取消支付，放弃支付会返回会员页面，页面提示支付取消；2.判断支付方式，如果是1，则是微信支付方式。1.判断是否在微信内支付，需要在微信外支付。
U3D热更新技术
iOS修改ipa并重新签名打包
Mac命令行修改ipa并重新签名打包
UniApp 在 iOS 16 下真机自定义基座调试指南，可解决模拟器无法输出调试日志问题
首先在 iOS 设备中打开开发者模式。位于：设置 - 隐私&安全 - 开发者模式（需重启）
IOS开发之——Undefined symbol:_OBJC_CLASS
一 现象导入MBProgressHUD显示信息时，出现如下异常现象Undefined symbols for architecture x86_64: "_OBJC_CLASS_$_MBProgressHUD", referenced from: objc-class-ref in ViewController.old: symbol(s) not found for architecture x86_64clang: error: linker command failed wit
uni-app开发App上架Apple Store流程简略版
Profiles >> 加号添加 >> Distribution >> "App Store" >> 选择 2.1 创建的App ID >> 选择绑定 2.3 的发布证书（.cer）>> 输入描述文件名称 >> Generate 生成描述文件 >> Download。Certificates >> 加号添加 >> "App Store and Ad Hoc" >> “Choose File...” >> 选择上一步生成的证书请求文件 >> Continue >> Download。
Unity 分享 功能 用Unity Native Share Plugin 实现链接、图片、视频等文件的分享+ 安卓 Ios 都可以，代码图文详解
今天有需求，要实现的功能大致如下：在安卓和ios端实现分享功能可以分享链接，图片，文字，视频，文件，等欢迎大佬多多来给萌新指正，欢迎大家来共同探讨。如果各位看官觉得文章有点点帮助，跪求各位给点个“一键三连”，谢啦~声明：本博文章若非特殊注明皆为原创原文链接。
pythonJavaScriptjavaHTMLPHPreactjsC#AndroidCSSNode.jssqlrpython-3.xMysqLjQueryc++pandasFlutterangularIOSdjangolinuxswifttypescript路由器JSON路由器设置无线路由器h3c华三华三路由器设置华三路由器电脑软件教程arraysdocker软件图文教程Cvue.jslaravelspring-boot