iOS 当网络连接不佳时，应用程序在启动时会挂起一段时间

Question

我有一个大问题，我在 Subway 测试我的应用程序，当我在一个超级糟糕的覆盖站时，我的应用程序在开始的第一个屏幕上冻结了一段时间（比如 30 秒或 1 分钟）来自 cero 的应用程序，然后一切都开始正常工作。

我有 2 个函数负责在我的 WS 中查找信息（响应是 JSON）并且我已将此 NSURLRequest 的时间设置为 2.5 秒，因此如果服务器有点慢，无论出于什么原因，我寻找存储在 iPhone 中的 JSON 文件，而不是服务器中的文件。

如果我在打开飞行模式的情况下测试我的应用程序，我的代码就像一个魅力，一切都从设备读取，但如果我的覆盖率非常低或者我模拟了它，应用程序会冻结然后像打开一样工作飞行模式。

如果我在 Xcode 中添加断点，一切都会像往常一样执行（我的意思是快速），最后调用的函数是 viewWillAppear:.

有没有人有类似的问题？或者有人知道会发生什么？

如有任何想法，我们将不胜感激。

提前致谢。

这是我用来获取 JSON:

的函数

-(NSData *)getMainMenuJsonData{
    NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
    if ([[defaults objectForKey:@"OnLine"] boolValue] ) {
        NSString *urlAsString = [NSString stringWithFormat:@"%@%@/%@/%@",[configs valueForKey:@"wsURL"], [configs valueForKey:@"clientToken"], [configs valueForKey:@"appToken"], [CommonsUtils getCommonUtil].getAppLanguage];
        NSURLRequest * urlRequest = [NSURLRequest requestWithURL:[NSURL URLWithString:urlAsString] cachePolicy:NSURLRequestReloadIgnoringCacheData timeoutInterval:2.5];
        NSURLResponse * response = nil;
        NSError * error = nil;
        NSData * data = [NSURLConnection sendSynchronousRequest:urlRequest returningResponse:&response error:&error];

        plistPath = [[NSBundle mainBundle] pathForResource:@"Config" ofType:@"plist"];
        configs = [[NSDictionary alloc] initWithContentsOfFile:plistPath];
        NSUInteger statusCode = ((NSHTTPURLResponse *)response).statusCode;

        if (statusCode == 200 && error == Nil) {
            if (error != Nil) {
                return Nil;
            } else {
                return data;
            }
        }
        else {
            return Nil;
        }
    }
    else {
        return Nil;
    }
}

-(NSData *)getSpecificJsonData:(NSString *)itemId{
    NSString *urlAsString = [NSString stringWithFormat:@"%@%@/%@/%@/%@",[configs valueForKey:@"wsURL"], [configs valueForKey:@"clientToken"], [configs valueForKey:@"appToken"], [CommonsUtils getCommonUtil].getAppLanguage, itemId];
    NSURLRequest * urlRequest = [NSURLRequest requestWithURL:[NSURL URLWithString:urlAsString] cachePolicy:NSURLRequestReloadIgnoringCacheData timeoutInterval:2.5];
    NSURLResponse * response = nil;
    NSError * error = nil;
    NSData * data = [NSURLConnection sendSynchronousRequest:urlRequest returningResponse:&response error:&error];

    plistPath = [[NSBundle mainBundle] pathForResource:@"Config" ofType:@"plist"];
    configs = [[NSDictionary alloc] initWithContentsOfFile:plistPath];
    NSUInteger statusCode = ((NSHTTPURLResponse *)response).statusCode;

    if (statusCode == 200 && error == Nil) {
        if (error != Nil) {
            return Nil;
        } else {
            return data;
        }
    }
    else {
        return Nil;
    }
}

这是我主屏幕的所有代码，一旦加载并调用 viewWillAppear:，如果我触摸屏幕上的其中一个按钮，则需要一段时间（例如 30 秒或 1 分钟）来执行 btnAction : 函数:

//
//  vcMainScreen.m
//  SmartHotel
//
//  Created by GoSmart on 08/07/13.
//  Copyright (c) 2013 GoSmart. All rights reserved.
//

#import "vcMainScreen.h"
#import "Util.h"
#import "Reachability.h"
#import "CommonsUtils.h"

@interface vcMainScreen ()
@property (nonatomic) Reachability *reachabilityInfo;
@end

@implementation vcMainScreen {
    NSDictionary *dValue;
    NSData *jsonData;
    NSDictionary *dConfiguration, *configs, *languages;
    Util *util;
    BOOL ok;
    NSString *plistPath, *language;
}

@synthesize tabController;

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

    }
    return self;
}

- (void)viewDidLoad
{
    _reachabilityInfo = [Reachability reachabilityWithHostname:@"www.google.com"];
    [_reachabilityInfo startNotifier];

    [super viewDidLoad];
    util = [[Util alloc] crearUtil];
    [[self navigationController] setNavigationBarHidden:YES animated:NO];

    NetworkStatus internetStatus = [_reachabilityInfo currentReachabilityStatus];
    NSData *mainData = Nil;
    if (internetStatus != NotReachable)
    mainData = [util getMainMenuJsonData];

    if (mainData != Nil) {
        jsonData = mainData;
    }
    else {
        plistPath = [[NSBundle mainBundle] pathForResource:@"Config" ofType:@"plist"];
        configs = [[NSDictionary alloc] initWithContentsOfFile:plistPath];
        languages = [configs valueForKey:@"Languages"];

        for (NSString * appLanguage in [NSLocale preferredLanguages])
        {
            language = [[languages valueForKey:appLanguage] objectAtIndex:0];
            if ([language isEqual:[NSNull null]]) {
                language = [[languages valueForKey:@"default"] objectAtIndex:0];
            }
            else{
                break;
            }
        }

        NSString *jsonPath = [NSString stringWithFormat:@"%@/%@.json",[NSSearchPathForDirectoriesInDomains (NSDocumentDirectory,NSUserDomainMask, YES) objectAtIndex:0],language];
        jsonData = [NSData dataWithContentsOfFile:jsonPath];
    }

    dConfiguration =[NSJSONSerialization JSONObjectWithData:jsonData options:kNilOptions error:nil];
    [self createTabBar];
    NSInteger count = 0;
    for (UIView* subView in self.view.subviews)
    {
        if ([subView isKindOfClass:[UIButton class]]) {
            UIButton *bCustom = (UIButton *)subView;
            [bCustom addTarget:self action:@selector(btnAction:) forControlEvents:UIControlEventTouchUpInside];
            count ++;
        }
    }
    dValue = [[dConfiguration objectForKey:@"BackgroundImage"] objectAtIndex:0];
    _ivBackGround.image = [UIImage imageNamed:[util getBackgroundImageName:[dValue objectForKey:@"Image"] andRetrina:[dValue objectForKey:@"ImageRetina"]]];
    self.navigationItem.title = @"Home";
}

- (void)viewWillAppear:(BOOL)animated
{
    [self.navigationController setNavigationBarHidden:YES animated:animated];
    [super viewWillAppear:animated];

    // Tracking view for analytics
    id tracker = [[GAI sharedInstance] defaultTracker];
    [tracker set:kGAIScreenName value:self.navigationItem.title];
    [tracker send:[[GAIDictionaryBuilder createAppView] build]];
}

- (void)viewWillDisappear:(BOOL)animated
{
    [self.navigationController setNavigationBarHidden:YES animated:animated];
    [super viewWillDisappear:animated];
}

- (BOOL)shouldAutorotate
{
    return YES;
}

- (NSUInteger)supportedInterfaceOrientations
{
    if ([[UIDevice currentDevice] userInterfaceIdiom] == UIUserInterfaceIdiomPhone) {
        return UIInterfaceOrientationMaskPortrait;
    } else {
        return UIInterfaceOrientationMaskAll;
    }
}

- (UIInterfaceOrientation)preferredInterfaceOrientationForPresentation
{
    return UIInterfaceOrientationPortrait;
}

- (void)didReceiveMemoryWarning
{
    [super didReceiveMemoryWarning];
}

- (void)createTabBar
{   
    tabController = [self.storyboard instantiateViewControllerWithIdentifier:@"cCustomTabController"];
    dValue = [dConfiguration objectForKey:@"Buttons"];
    NSMutableArray  *aControllers = [[NSMutableArray alloc] init];
    int i = 0;
    for (NSString* sProperty in dValue) {
        NSString* d = @"Details";
        NetworkStatus internetStatus = [_reachabilityInfo currentReachabilityStatus];
        NSData *itemData = Nil;
        NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
        if (internetStatus != NotReachable && [[defaults objectForKey:@"OnLine"] boolValue])
            itemData = [util getSpecificJsonData:[sProperty valueForKeyPath:@"Item"]];
        if(itemData != nil){
            UIStoryboard *aStoryboard = [UIStoryboard storyboardWithName:@"Main_iPhone" bundle:[NSBundle mainBundle]];
            UIViewController *vcCustom = [aStoryboard instantiateViewControllerWithIdentifier:[util getControllerName:[sProperty valueForKeyPath:@"ViewController"]]];
            [vcCustom setValue:itemData forKey:@"JsonData"];
            [vcCustom setValue:[sProperty valueForKeyPath:@"Item"] forKey:@"Item"];
            [vcCustom setValue:d forKey:@"Details"];
            [util saveJSON:itemData withName:[NSString stringWithFormat:@"%@%@",[sProperty valueForKeyPath:@"Item"],[CommonsUtils getCommonUtil].getAppLanguage]];
            [[vcCustom navigationController] setNavigationBarHidden:NO animated:NO];
            vcCustom.navigationItem.leftBarButtonItem = Nil;
            vcCustom.navigationItem.hidesBackButton = YES;
            UIImage *imageBtn = [UIImage imageNamed:[util getImageName:[sProperty valueForKeyPath:@"Image"] andRetrina:[sProperty valueForKeyPath:@"ImageRetina"]]];
            UIImage *imageBtnPress = [UIImage imageNamed:[util getImageName:[sProperty valueForKeyPath:@"ImageHeighlighted"] andRetrina:[sProperty valueForKeyPath:@"ImageRetinaHeighlighted"]]];
            UITabBarItem *tab = [[UITabBarItem alloc] initWithTitle:[sProperty valueForKeyPath:@"Title"] image:imageBtn selectedImage:imageBtnPress];
            UIImage * iSelected = imageBtnPress;
            iSelected = [iSelected imageWithRenderingMode:UIImageRenderingModeAlwaysOriginal];
            [tab setSelectedImage:iSelected];
            tab.tag = i;
            if([[sProperty valueForKeyPath:@"Title"] isEqualToString:@"Notificaciones"])
                tab.badgeValue=[sProperty valueForKeyPath:@"Badge"];
            [vcCustom setTabBarItem:tab];
            [vcCustom setTitle:[sProperty valueForKeyPath:@"Title"]];
            UINavigationController *navigationController = [[cCustomNavigationController alloc] initWithRootViewController:vcCustom];
            navigationController.navigationBar.tintColor = [UIColor colorWithRed:36.0/255.0 green:134.0/255.0 blue:232.0/255.0 alpha:1];
            [aControllers insertObject:navigationController atIndex:i];
            i++;
        }
        else
        {
            UIStoryboard *aStoryboard = [UIStoryboard storyboardWithName:@"Main_iPhone" bundle:[NSBundle mainBundle]];
            UIViewController *vcCustom = [aStoryboard instantiateViewControllerWithIdentifier:[util getControllerName:[sProperty valueForKeyPath:@"ViewController"]]];
            NSNumber *val = [NSNumber numberWithInteger:i];
            NSString *nextJson = [sProperty valueForKeyPath:@"JsonConfigFile"];
            [vcCustom setValue:[sProperty valueForKeyPath:@"Item"] forKey:@"Item"];
            [vcCustom setValue:nextJson forKey:@"JsonConfigFile"];
            [vcCustom setValue:val forKey:@"MenuButtonSelectedTag"];
            [[vcCustom navigationController] setNavigationBarHidden:NO animated:NO];
            vcCustom.navigationItem.leftBarButtonItem = Nil;
            vcCustom.navigationItem.hidesBackButton = YES;
            UIImage *imageBtn = [UIImage imageNamed:[util getImageName:[sProperty valueForKeyPath:@"Image"] andRetrina:[sProperty valueForKeyPath:@"ImageRetina"]]];
            UIImage *imageBtnPress = [UIImage imageNamed:[util getImageName:[sProperty valueForKeyPath:@"ImageHeighlighted"] andRetrina:[sProperty valueForKeyPath:@"ImageRetinaHeighlighted"]]];
            UITabBarItem *tab = [[UITabBarItem alloc] initWithTitle:[sProperty valueForKeyPath:@"Title"] image:imageBtn selectedImage:imageBtnPress];
            UIImage * iSelected = imageBtnPress;
            iSelected = [iSelected imageWithRenderingMode:UIImageRenderingModeAlwaysOriginal];
            [tab setSelectedImage:iSelected];
            tab.tag = i;
            if([[sProperty valueForKeyPath:@"Title"] isEqualToString:@"Notificaciones"])
                tab.badgeValue=[sProperty valueForKeyPath:@"Badge"];
            [vcCustom setTabBarItem:tab];
            [vcCustom setTitle:[sProperty valueForKeyPath:@"Title"]];
            UINavigationController *navigationController = [[cCustomNavigationController alloc] initWithRootViewController:vcCustom];
            navigationController.navigationBar.tintColor = [UIColor colorWithRed:36.0/255.0 green:134.0/255.0 blue:232.0/255.0 alpha:1];
            [aControllers insertObject:navigationController atIndex:i];
            i++;
        }


    }
    tabController.delegate = self;
    tabController.viewControllers = aControllers;
    tabController.tabBar.tintColor = [UIColor blackColor];
}

-(BOOL)tabBarController:(UITabBarController *)tabBarController shouldSelectViewController:(UIViewController *)viewController{
    return YES;
}

- (IBAction)btnAction:(id)sender {
    UIButton *bCustom = (UIButton *)sender;

    tabController.selectedIndex = bCustom.tag;

    id<GAITracker> tracker= [[GAI sharedInstance] defaultTracker];

    [tracker send:[[GAIDictionaryBuilder createEventWithCategory: @"ui_button"
                                                          action: @"button_press"
                                                           label: [NSString stringWithFormat:@"%@-%@", self.title, [[tabController.viewControllers objectAtIndex:bCustom.tag] title]]
                                                           value: nil] build]];

    [self.navigationController pushViewController:tabController animated:YES];
}

@end

这是我的设置 iPhone:

Answer 1

对此没有正确的答案，我在 AppDelegate 中的一个线程中调用了我的 WS，这使 UI 冻结，感谢@Guillaume Algis 和 this 我能够找到并解决我的问题。

一如既往地感谢您的帮助。

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