У меня была похожая проблема в веб-представлении в одном из моих приложений.Кажется, что в iphone SDK есть утечка памяти при просмотре веб-страниц.Мое приложение зависло, когда в веб-представлении был большой текст, и некоторые другие проблемы. Этот код помог мне предотвратить утечку памяти.Я надеюсь, что это работает и для вас.
Вот инструкции по этой ссылке:
Предотвращение утечек памяти, связанных с UIWebView, может быть затруднено.Документация Apple по этому вопросу скудна и не прямолинейна, просто потому, что UIWebView - это сложный зверь, в котором используется множество базовых классов.Эта категория Objective-C представляет собой набор идей и теорий (мыслите магией, а не наукой ...), собранных из различных веб-блогов и дискуссий на эту тему.Для большего количества идей управления памятью Objective-C, проверьте WIJL: Управление памятью IOS.Использовать категорию просто:
Загрузите код: UIWebView + Clean.zip
- Добавьте файлы UIWebView + Clean.h и .m в ваш проект.
- Импорт
UIWebView+Clean.h в любые файлы, в которых вы хотите использовать категорию. - Используйте метод
cleanForDealloc везде, где вы собираетесь освободить UIWebView:
[self.webView cleanForDealloc];
self.webView = nil;
Это UIWebView+Clean.h:
/*
UIWebView+Clean.h
A simple category that performs recommended UIWebView clean before dealloc
Created by Jason Baker (jason@onejasonforsale.com) for TumbleOn on 3/18/12.
Copyright (c) 2012, Pocket Sized Giraffe, LLC
All rights reserved.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are met:
1. Redistributions of source code must retain the above copyright notice, this
list of conditions and the following disclaimer.
2. Redistributions in binary form must reproduce the above copyright notice,
this list of conditions and the following disclaimer in the documentation
and/or other materials provided with the distribution.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
The views and conclusions contained in the software and documentation are those
of the authors and should not be interpreted as representing official policies,
either expressed or implied.
*/
#import <Foundation/Foundation.h>
@interface UIWebView (clean)
// performs various cleanup activities recommended for UIWebView before dealloc.
// see comments in implementation for usage examples
- (void) cleanForDealloc;
@end
И это UIWebView+Clean.m:
/*
UIWebView+Clean.h
A simple category that performs recommended UIWebView clean before dealloc
Created by Jason Baker (jason@onejasonforsale.com) for TumbleOn on 3/18/12.
Copyright (c) 2012, Pocket Sized Giraffe, LLC
All rights reserved.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are met:
1. Redistributions of source code must retain the above copyright notice, this
list of conditions and the following disclaimer.
2. Redistributions in binary form must reproduce the above copyright notice,
this list of conditions and the following disclaimer in the documentation
and/or other materials provided with the distribution.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
The views and conclusions contained in the software and documentation are those
of the authors and should not be interpreted as representing official policies,
either expressed or implied.
*/
#import "UIWebView+Clean.h"
@implementation UIWebView (clean)
/*
Using this Category is easy, simply add this to the top of your file where
you have a UIWebView:
#import "UIWebView+Clean.h"
Then, any time you want to throw away or deallocate a UIWebView instance, do
the following before you throw it away:
[self.webView cleanForDealloc];
self.webView = nil;
If you still have leak issues, read the notes at the bottom of this class,
they may help you.
*/
- (void) cleanForDealloc
{
/*
There are several theories and rumors about UIWebView memory leaks, and how
to properly handle cleaning a UIWebView instance up before deallocation. This
method implements several of those recommendations.
#1: Various developers believe UIWebView may not properly throw away child
objects & views without forcing the UIWebView to load empty content before
dealloc.
Source: /627205/uiwebview-utechka-pamyati
*/
[self loadHTMLString:@"" baseURL:nil];
/*
#2: Others claim that UIWebView's will leak if they are loading content
during dealloc.
Source: http://stackoverflow.com/questions/6124020/uiwebview-leaking
*/
[self stopLoading];
/*
#3: Apple recommends setting the delegate to nil before deallocation:
"Important: Before releasing an instance of UIWebView for which you have set
a delegate, you must first set the UIWebView delegate property to nil before
disposing of the UIWebView instance. This can be done, for example, in the
dealloc method where you dispose of the UIWebView."
Source: UIWebViewDelegate class reference
*/
self.delegate = nil;
/*
#4: If you're creating multiple child views for any given view, and you're
trying to deallocate an old child, that child is pointed to by the parent
view, and won't actually deallocate until that parent view dissapears. This
call below ensures that you are not creating many child views that will hang
around until the parent view is deallocated.
*/
[self removeFromSuperview];
/*
Further Help with UIWebView leak problems:
#1: Consider implementing the following in your UIWebViewDelegate:
- (void) webViewDidFinishLoad:(UIWebView *)webView
{
//source: http://blog.techno-barje.fr/post/2010/10/04/UIWebView-secrets-part1-memory-leaks-on-xmlhttprequest/
[[NSUserDefaults standardUserDefaults] setInteger:0 forKey:@"WebKitCacheModelPreferenceKey"];
}
#2: If you can, avoid returning NO in your UIWebViewDelegate here:
- (BOOL)webView:(UIWebView *)webView shouldStartLoadWithRequest:(NSURLRequest *)request navigationType:(UIWebViewNavigationType)navigationType
{
//this source says don't do this: http://stackoverflow.com/questions/6421813/lots-of-uiwebview-memory-leaks
//return NO;
return YES;
}
#3: Some leaks appear to be fixed in IOS 4.1
Source: http://stackoverflow.com/questions/3857519/memory-leak-while-using-uiwebview-load-request-in-ios4-0
#4: When you create your UIWebImageView, disable link detection if possible:
webView.dataDetectorTypes = UIDataDetectorTypeNone;
(This is also the "Detect Links" checkbox on a UIWebView in Interfacte Builder.)
Sources:
http://www.iphonedevsdk.com/forum/iphone-sdk-development/46260-how-free-memory-after-uiwebview.html
http://www.iphonedevsdk.com/forum/iphone-sdk-development/29795-uiwebview-how-do-i-stop-detecting-links.html
http://blog.techno-barje.fr/post/2010/10/04/UIWebView-secrets-part2-leaks-on-release/
#5: Consider cleaning the NSURLCache every so often:
[[NSURLCache sharedURLCache] removeAllCachedResponses];
[[NSURLCache sharedURLCache] setDiskCapacity:0];
[[NSURLCache sharedURLCache] setMemoryCapacity:0];
Source: http://blog.techno-barje.fr/post/2010/10/04/UIWebView-secrets-part2-leaks-on-release/
Be careful with this, as it may kill cache objects for currently executing URL
requests for your application, if you can't cleanly clear the whole cache in
your app in some place where you expect zero URLRequest to be executing, use
the following instead after you are done with each request (note that you won't
be able to do this w/ UIWebView's internal request objects..):
[[NSURLCache sharedURLCache] removeCachedResponseForRequest:request];
Source: http://stackoverflow.com/questions/6542114/clearing-a-webviews-cache-for-local-files
*/
}
@end