堆栈内存溢出
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从NSMutableStrings循环填充NSMutableArray时，应用程序崩溃

[英]App crashes when populating NSMutableArray from loop of NSMutableStrings

 原文  2014-03-03 15:44:17  7   1    ios/ memory-management/ xcode5

问题描述

我是Objective C的新手，所以这段代码可能写得不太好。

启动应用程序后，如果尚未将其保存到手机中，它将调用以下代码。 当它开始循环进入while循环时，该应用程序会在不是iphone 5s的任何电话上崩溃。 我认为这是由于内存使用情况。 我相信，当创建NSMutableString（movieTitle）时，在while循环内就是内存峰值。 我还应该补充一点，循环的迭代次数约为6000。

基本上，html代码是从URL生成的，并根据网站上html的编写方式对其进行处理，以查找电影和节目。 它会捕获所有电影名称和节目名称，以便我可以将它们用于自动完成。 

if (appDelegate.movieArray.count == 0 && [self detectWifi]) {

    appDelegate.movieArray = [[NSMutableArray alloc]init];

    NSString *showUrlString = [NSString stringWithFormat:@"http://http:www.website1.com"];
    NSURL *ShowURL = [NSURL URLWithString:showUrlString];
    NSError *showerror;
    NSString *showPage = [NSString stringWithContentsOfURL:ShowURL
                                                  encoding:NSASCIIStringEncoding
                                                     error:&showerror];


    NSString *movieUrlString = [NSString stringWithFormat:@"http://www.website2.com"];
    NSURL *MovieURL = [NSURL URLWithString:movieUrlString];
    NSError *movieerror;
    NSString *moviePage = [NSString stringWithContentsOfURL:MovieURL
                                                   encoding:NSASCIIStringEncoding
                                                      error:&movieerror];

    showPage = [showPage substringFromIndex:[showPage rangeOfString:@"</a><span class=\"mw-editsection-bracket\">]</span></span></h2>"].location];
    showPage = [showPage substringToIndex:[showPage rangeOfString:@"NewPP limit report"].location];

    //Gets all movies
    moviePage = [moviePage substringFromIndex:[moviePage rangeOfString:@"</a><span class=\"mw-editsection-bracket\">]</span></span></h2>"].location];
    moviePage = [moviePage substringToIndex:[moviePage rangeOfString:@"<h2><span class=\"mw-headline\" id=\"Notes\">Notes</span>"].location];
    moviePage = [moviePage stringByAppendingString:showPage];
    int counter = 0;

    while ([moviePage rangeOfString:@"<li><i><a href=\""].location != NSNotFound) {

        @autoreleasepool{
            moviePage = [moviePage substringFromIndex:[moviePage rangeOfString:@"<li><i><a href=\""].location + 16];
            moviePage = [moviePage substringFromIndex:[moviePage rangeOfString:@">"].location + 1];
            NSMutableString *movieTitle = [self getTitle:moviePage];
            moviePage = [moviePage substringFromIndex:[moviePage rangeOfString:@"</li>"].location + 4];
            if (![appDelegate.movieArray containsObject:movieTitle]) [appDelegate.movieArray addObject:movieTitle];

        }

        counter ++;
        NSLog(@"%d",counter);
    }

    [[NSUserDefaults standardUserDefaults] setObject:appDelegate.movieArray forKey:@"movieArray"];
    NSLog(@"%@",appDelegate.movieArray);


}

这是我认为手机因内存高峰而崩溃的部分。 

NSMutableString *movieTitle = [self getTitle:moviePage];

这是getTitle的函数 

-(NSMutableString*)getTitle:(NSString *)line {
@autoreleasepool{

NSMutableString *movieTitle = [[line substringToIndex:[line rangeOfString:@"</a>"].location]mutableCopy];

if ([movieTitle rangeOfString:@", The"].location != NSNotFound) {
    movieTitle = [[movieTitle substringToIndex:[movieTitle rangeOfString:@", The"].location]mutableCopy];
    movieTitle = [[@"The " stringByAppendingString:movieTitle]mutableCopy];
}
if ([movieTitle rangeOfString:@",The"].location != NSNotFound) {
    movieTitle = [[movieTitle substringToIndex:[movieTitle rangeOfString:@",The"].location]mutableCopy];
    movieTitle = [[@"The " stringByAppendingString:movieTitle]mutableCopy];
}

if ([movieTitle rangeOfString:@", A"].location != NSNotFound) {
    movieTitle = [[movieTitle substringToIndex:[movieTitle rangeOfString:@", A"].location]mutableCopy];
    movieTitle = [[@"A " stringByAppendingString:movieTitle]mutableCopy];
}
if ([movieTitle rangeOfString:@" ("].location != NSNotFound) {
    movieTitle = [[movieTitle substringToIndex:[movieTitle rangeOfString:@" ("].location]mutableCopy];
}
if ([movieTitle rangeOfString:@"&amp;"].location != NSNotFound) {
    movieTitle = [[movieTitle stringByReplacingOccurrencesOfString:@"&amp;" withString:@"&"]mutableCopy];
}
if ([movieTitle rangeOfString:@"&#039;"].location != NSNotFound) {
    movieTitle = [[movieTitle stringByReplacingOccurrencesOfString:@"&#039;" withString:@"'"]mutableCopy];
}
    return movieTitle;
}}

如您所见，我尝试使用autoreleasepool减少内存使用量，但这不足以阻止应用程序崩溃。 我想对我来说部分问题是我不了解Apple的存储规则。 另外，我使用的是ARC规则，所以我不能简单地调用release，autorelease..etc。

另一个怪异的问题是，在5s以外的任何iphone上，当它使用xcode进行调试（插入到Mac并在其中运行应用程序）时，该应用程序都会运行并且不会崩溃。

我该怎么做才能使此代码更有效，以使我不占用太多内存，从而使该应用程序在所有设备上都能正常工作？

我在ipad 2上模拟了错误： 

    Incident Identifier: F63CD360-E641-400B-932D-31DAD0462785
CrashReporter Key:   3a33921df83f611ce711881c8d295ed62cc68b55
Hardware Model:      iPad2,1
Process:             MovieAlert [28858]
Path:                /var/mobile/Applications/26822004-FC06-4943-916C-5BBA670E22A2/MovieAlert.app/MovieAlert
Identifier:          com.netglow.MovieAlert.MovieAlert
Version:             1.0 (1.0)
Code Type:           ARM (Native)
Parent Process:      launchd [1]

Date/Time:           2014-03-03 12:22:02.873 -0500
OS Version:          iOS 7.1 (11D5145e)
Report Version:      104

Exception Type:  00000020
Exception Codes: 0x000000008badf00d
Highlighted Thread:  0

Application Specific Information:
com.netglow.MovieAlert.MovieAlert failed to launch in time

Elapsed total CPU time (seconds): 24.630 (user 24.630, system 0.000), 56% CPU 
Elapsed application CPU time (seconds): 21.145, 48% CPU

Thread 0:
0   libsystem_platform.dylib        0x3b6f6490 _platform_memset$VARIANT$CortexA9 + 200
1   CoreFoundation                  0x3032c72e _CFRuntimeCreateInstance + 238
2   CoreFoundation                  0x303d26e8 __CFStringCreateImmutableFunnel3 + 1584
3   CoreFoundation                  0x3034d8a0 CFStringCreateWithSubstring + 324
4   CoreFoundation                  0x3034d734 -[__NSCFString substringWithRange:] + 192
5   MovieAlert                      0x000e4372 -[NGAppDelegate application:didFinishLaunchingWithOptions:] (NGAppDelegate.m:57)
6   UIKit                           0x32e0e392 -[UIApplication _handleDelegateCallbacksWithOptions:isSuspended:restoreState:] + 270
7   UIKit                           0x32e0dce6 -[UIApplication _callInitializationDelegatesForURL:payload:suspended:] + 1606
8   UIKit                           0x32e08376 -[UIApplication _runWithURL:payload:launchOrientation:statusBarStyle:statusBarHidden:] + 710
9   UIKit                           0x32da4564 -[UIApplication handleEvent:withNewEvent:] + 3536
10  UIKit                           0x32da36cc -[UIApplication sendEvent:] + 68
11  UIKit                           0x32e07ab4 _UIApplicationHandleEvent + 612
12  GraphicsServices                0x353f8aea _PurpleEventCallback + 606
13  GraphicsServices                0x353f86d2 PurpleEventCallback + 30
14  CoreFoundation                  0x303c8ab4 __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE1_PERFORM_FUNCTION__ + 32
15  CoreFoundation                  0x303c8a4e __CFRunLoopDoSource1 + 342
16  CoreFoundation                  0x303c7222 __CFRunLoopRun + 1394
17  CoreFoundation                  0x30331f4a CFRunLoopRunSpecific + 518
18  CoreFoundation                  0x30331d2e CFRunLoopRunInMode + 102
19  UIKit                           0x32e06cdc -[UIApplication _run] + 756
20  UIKit                           0x32e01f90 UIApplicationMain + 1132
21  MovieAlert                      0x000e2e04 main (main.m:16)
22  libdyld.dylib                   0x3b5dbab4 start + 0

Thread 1:
0   libsystem_kernel.dylib          0x3b67e808 kevent64 + 24
1   libdispatch.dylib               0x3b5c0078 _dispatch_mgr_invoke + 228
2   libdispatch.dylib               0x3b5bfdfe _dispatch_mgr_thread$VARIANT$mp + 34

Thread 2 name:  com.apple.NSURLConnectionLoader
Thread 2:
0   libsystem_kernel.dylib          0x3b67ea58 mach_msg_trap + 20
1   libsystem_kernel.dylib          0x3b67e854 mach_msg + 44
2   CoreFoundation                  0x303c8896 __CFRunLoopServiceMachPort + 150
3   CoreFoundation                  0x303c6fbc __CFRunLoopRun + 780
4   CoreFoundation                  0x30331f4a CFRunLoopRunSpecific + 518
5   CoreFoundation                  0x30331d2e CFRunLoopRunInMode + 102
6   Foundation                      0x30dcc082 +[NSURLConnection(Loader) _resourceLoadLoop:] + 314
7   Foundation                      0x30e41a5a __NSThread__main__ + 1058
8   libsystem_pthread.dylib         0x3b6fa916 _pthread_body + 138
9   libsystem_pthread.dylib         0x3b6fa886 _pthread_start + 98
10  libsystem_pthread.dylib         0x3b6f8aa0 thread_start + 4

Thread 3 name:  com.apple.CFSocket.private
Thread 3:
0   libsystem_kernel.dylib          0x3b691434 __select + 20
1   CoreFoundation                  0x303cc758 __CFSocketManager + 480
2   libsystem_pthread.dylib         0x3b6fa916 _pthread_body + 138
3   libsystem_pthread.dylib         0x3b6fa886 _pthread_start + 98
4   libsystem_pthread.dylib         0x3b6f8aa0 thread_start + 4

No thread state (register information) available
Binary Images:
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0x2be97000 - 0x2beb7fff dyld armv7  <651a31c39f71311f965f8ac44de02c88> /usr/lib/dyld
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0x395be000 - 0x395c6fff XPCObjects armv7  <6f8ac65cd26132dda80f1ae065ad5884> /System/Library/PrivateFrameworks/XPCObjects.framework/XPCObjects
0x3a590000 - 0x3a597fff libAccessibility.dylib armv7  <eb98252afe373c488c7669d56c982b10> /usr/lib/libAccessibility.dylib
0x3a6a2000 - 0x3a6b8fff libCRFSuite.dylib armv7  <b3daa0f4be4c33af860990ee476791bc> /usr/lib/libCRFSuite.dylib
0x3a6ce000 - 0x3a6e3fff libMobileGestalt.dylib armv7  <47289759f4c83507b2a9afed6bd7251c> /usr/lib/libMobileGestalt.dylib
0x3a701000 - 0x3a702fff libSystem.B.dylib armv7  <97960d9242ec3758840f47db50f187cf> /usr/lib/libSystem.B.dylib
0x3a771000 - 0x3a7a2fff libTelephonyUtilDynamic.dylib armv7  <e2d62970e01b373f9b8ad4c4aee0a674> /usr/lib/libTelephonyUtilDynamic.dylib
0x3a8f1000 - 0x3a8fdfff libbsm.0.dylib armv7  <cbf50b2cb2ae3ff385d5d853551a33cf> /usr/lib/libbsm.0.dylib
0x3a8fe000 - 0x3a907fff libbz2.1.0.dylib armv7  <3a4d64c44c283997b46efa5712f9c2d1> /usr/lib/libbz2.1.0.dylib
0x3a908000 - 0x3a953fff libc++.1.dylib armv7  <a9e17626396330e4be0a636d853ecded> /usr/lib/libc++.1.dylib
0x3a954000 - 0x3a96efff libc++abi.dylib armv7  <dd16288fdf2d35179c1db87dcec17f2c> /usr/lib/libc++abi.dylib
0x3a97e000 - 0x3a985fff libcupolicy.dylib armv7  <c3a9cab470003636b63fe439f9b577a3> /usr/lib/libcupolicy.dylib
0x3aade000 - 0x3abcbfff libiconv.2.dylib armv7  <3faa29f3ddf53187b51e155344592e1b> /usr/lib/libiconv.2.dylib
0x3abcc000 - 0x3ad1dfff libicucore.A.dylib armv7  <a0225e27ea6933558bc3dfecdcf626fc> /usr/lib/libicucore.A.dylib
0x3ad25000 - 0x3ad25fff liblangid.dylib armv7  <8bb499713b5632adb09d7bb3a7b77a71> /usr/lib/liblangid.dylib
0x3ad26000 - 0x3ad30fff liblockdown.dylib armv7  <b7f5354d32ee38efbd3d99b1464d837f> /usr/lib/liblockdown.dylib
0x3b0af000 - 0x3b24efff libobjc.A.dylib armv7  <43454f30280c34cb958f0304384d9770> /usr/lib/libobjc.A.dylib
0x3b332000 - 0x3b347fff libresolv.9.dylib armv7  <9d15aa14d7773e599e6cee134be9ebd0> /usr/lib/libresolv.9.dylib
0x3b370000 - 0x3b406fff libsqlite3.dylib armv7  <2bb2ac06753238828be8593055a08773> /usr/lib/libsqlite3.dylib
0x3b407000 - 0x3b454fff libstdc++.6.dylib armv7  <60d2a9f34296398bb7c057e01fde6afc> /usr/lib/libstdc++.6.dylib
0x3b455000 - 0x3b47bfff libtidy.A.dylib armv7  <1038b4aac4c9322fb6fc14b57e71ab02> /usr/lib/libtidy.A.dylib
0x3b47f000 - 0x3b532fff libxml2.2.dylib armv7  <610d9be70005338f9db94dbcaf1b6459> /usr/lib/libxml2.2.dylib
0x3b533000 - 0x3b554fff libxslt.1.dylib armv7  <c5d2c1db0a203d26a577d6c231b3640d> /usr/lib/libxslt.1.dylib
0x3b555000 - 0x3b561fff libz.1.dylib armv7  <76b41c58034a30dabe6ad9be1e637644> /usr/lib/libz.1.dylib
0x3b562000 - 0x3b566fff libcache.dylib armv7  <fefc4161821f300d85fff4af094b206c> /usr/lib/system/libcache.dylib
0x3b567000 - 0x3b56ffff libcommonCrypto.dylib armv7  <4c0bda8ed1b83b6d97f4fa911f22c83c> /usr/lib/system/libcommonCrypto.dylib
0x3b570000 - 0x3b574fff libcompiler_rt.dylib armv7  <8f8460474e9d36b4beb26f9851bd794d> /usr/lib/system/libcompiler_rt.dylib
0x3b575000 - 0x3b57bfff libcopyfile.dylib armv7  <7b5021a1b7d5386791a6d6b7658258f6> /usr/lib/system/libcopyfile.dylib
0x3b57c000 - 0x3b5b4fff libcorecrypto.dylib armv7  <912e56f196943500877e1aba46efcb78> /usr/lib/system/libcorecrypto.dylib
0x3b5b5000 - 0x3b5d9fff libdispatch.dylib armv7  <0b20ad8ff5373b85a62742a48cec386f> /usr/lib/system/libdispatch.dylib
0x3b5da000 - 0x3b5dbfff libdyld.dylib armv7  <5fc05181b5d03156a7a3ade0fc32276e> /usr/lib/system/libdyld.dylib
0x3b5dc000 - 0x3b5dcfff libkeymgr.dylib armv7  <754fc3f16bc53f01b4df0969a6461a1d> /usr/lib/system/libkeymgr.dylib
0x3b5dd000 - 0x3b5e3fff liblaunch.dylib armv7  <0c103f8e4aeb3416b54bdacf31fc2df1> /usr/lib/system/liblaunch.dylib
0x3b5e4000 - 0x3b5e7fff libmacho.dylib armv7  <9033cf6272eb3c789cdc2f426c401ffa> /usr/lib/system/libmacho.dylib
0x3b5e8000 - 0x3b5e9fff libremovefile.dylib armv7  <d7a3a855738935058cfd64a4429b2883> /usr/lib/system/libremovefile.dylib
0x3b5ea000 - 0x3b5f7fff libsystem_asl.dylib armv7  <c71706ec46b13bb89d6a9fd882ccc121> /usr/lib/system/libsystem_asl.dylib
0x3b5f8000 - 0x3b5f8fff libsystem_blocks.dylib armv7  <0178b6f1a9bf362d9672641076a42ee2> /usr/lib/system/libsystem_blocks.dylib
0x3b5f9000 - 0x3b65afff libsystem_c.dylib armv7  <b9729484ff92300bb601c95c2de24242> /usr/lib/system/libsystem_c.dylib
0x3b65b000 - 0x3b65dfff libsystem_configuration.dylib armv7  <5a3e13ad6e5b332d943b02ea0e2a6f37> /usr/lib/system/libsystem_configuration.dylib
0x3b65e000 - 0x3b664fff libsystem_dnssd.dylib armv7  <b4c9e43777c034589916c0e1df780035> /usr/lib/system/libsystem_dnssd.dylib
0x3b665000 - 0x3b67dfff libsystem_info.dylib armv7  <d9b6d914c95e39b1a788880c65e2c586> /usr/lib/system/libsystem_info.dylib
0x3b67e000 - 0x3b696fff libsystem_kernel.dylib armv7  <c53ca296071b3266b29ba64f0913c071> /usr/lib/system/libsystem_kernel.dylib
0x3b697000 - 0x3b6b6fff libsystem_m.dylib armv7  <c667c01b41913e38bc3a97417753a70d> /usr/lib/system/libsystem_m.dylib
0x3b6b7000 - 0x3b6c8fff libsystem_malloc.dylib armv7  <304862ec02e43c2d980a0852e2eaeda7> /usr/lib/system/libsystem_malloc.dylib
0x3b6c9000 - 0x3b6e9fff libsystem_network.dylib armv7  <0b4cc1aebe0a3bc7b036bb528107f338> /usr/lib/system/libsystem_network.dylib
0x3b6ea000 - 0x3b6f1fff libsystem_notify.dylib armv7  <f6561a42c76034358fa7f548d7370d3b> /usr/lib/system/libsystem_notify.dylib
0x3b6f2000 - 0x3b6f7fff libsystem_platform.dylib armv7  <9e431bb26aef3de5b81cd263f26376e8> /usr/lib/system/libsystem_platform.dylib
0x3b6f8000 - 0x3b6fdfff libsystem_pthread.dylib armv7  <eda21cf243e23680b1eb612f56cf610a> /usr/lib/system/libsystem_pthread.dylib
0x3b6fe000 - 0x3b6fffff libsystem_sandbox.dylib armv7  <cae56f034af23a1991bdfaba87c87880> /usr/lib/system/libsystem_sandbox.dylib
0x3b700000 - 0x3b702fff libsystem_stats.dylib armv7  <a254aceb982e370abd906f76ea94859c> /usr/lib/system/libsystem_stats.dylib
0x3b703000 - 0x3b703fff libunwind.dylib armv7  <45c29718368e3d1c8821911ab5953080> /usr/lib/system/libunwind.dylib
0x3b704000 - 0x3b71efff libxpc.dylib armv7  <8e38118685e5388db38bd8367d2d2c47> /usr/lib/system/libxpc.dylib

1 个解决方案

解决方案1
 1 已采纳  2014-03-03 18:08:09

通常，应用程序应在用户点击手机图标后的5秒钟内启动。 如果未在5秒钟内启动，则操作系统将退出该应用程序。 初始化应用程序的第一个视图后，所有需要花费更长时间的任务都必须执行。

链接在这里。 https://developer.apple.com/library/ios/documentation/iphone/conceptual/iphoneosprogrammingguide/ManagingYourApplicationsFlow/ManagingYourApplicationsFlow.html

它说：

您的application：willFinishLaunchingWithOptions：和application：didFinishLaunchingWithOptions：方法应始终尽可能轻巧，以减少应用程序的启动时间。 应用有望在不到5秒的时间内启动并初始化自己，并开始处理事件。 如果某个应用未及时完成启动周期，则系统会由于无响应而将其杀死。 因此，任何可能减慢启动速度的任务（例如访问网络）都应在辅助线程上异步执行。

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