IOS8: UIWebView memory leak - ios

Question

App description:
I want to develop an app, which shows websites during set time. If time elapsed, it will load next website etc. It must be run as loop: if last website showed, it shoes first.
AppDelegate was not changed.
Storyboard has a Navigation Controller with this ViewController, which include UIWebView:
ViewController.h
#import <UIKit/UIKit.h>
#interface ViewController : UIViewController <UIWebViewDelegate>
#end
ViewController.m:
#import "ViewController.h"
#interface ViewController ()
#property (weak, nonatomic) IBOutlet UIWebView *mWebView;
#end
#implementation ViewController
NSMutableArray *mSites;
NSInteger mIndex;
- (void)viewDidLoad {
NSLog(#"%s", __PRETTY_FUNCTION__);
[super viewDidLoad];
mSites = [[NSMutableArray alloc] init];
[mSites addObject:#"http://www.bild.de"];
[mSites addObject:#"http://www.spiegel.de"];
[self setWebView];
mIndex = -1;
[self showNext];
}
- (BOOL)prefersStatusBarHidden
{
NSLog(#"%s", __PRETTY_FUNCTION__);
return YES;
}
- (void)setWebView
{
NSLog(#"%s", __PRETTY_FUNCTION__);
[(self.mWebView.subviews)[0] setBounces:NO]; // No overscroll
[self.mWebView setDelegate:self];
}
- (void)freeMemory
{
NSLog(#"%s", __PRETTY_FUNCTION__);
[self.mWebView loadHTMLString:#"" baseURL:nil];
[self.mWebView stopLoading];
[self.mWebView setDelegate:nil];
[[NSURLCache sharedURLCache] removeAllCachedResponses];
[[NSURLCache sharedURLCache] setDiskCapacity:0];
[[NSURLCache sharedURLCache] setMemoryCapacity:0];
}
- (void)webViewDidFinishLoad: (UIWebView *)webView
{
NSLog(#"%s", __PRETTY_FUNCTION__);
// Clear cache
[[NSUserDefaults standardUserDefaults] setInteger:0 forKey:#"WebKitCacheModelPreferenceKey"];
}
- (void)handleTimer: (NSTimer *)timer
{
NSLog(#"%s", __PRETTY_FUNCTION__);
[self freeMemory];
[self setWebView];
[self showNext];
}
- (void)showNext
{
NSLog(#"%s", __PRETTY_FUNCTION__);
// Loop
if (mIndex < [mSites count] - 1) {
mIndex++;
} else {
mIndex = 0;
}
NSString *site = [mSites objectAtIndex:mIndex];
NSURL *url = [NSURL URLWithString:site];
NSURLRequest *request = [NSURLRequest requestWithURL:url];
[self.mWebView loadRequest:request];
[NSTimer scheduledTimerWithTimeInterval:15
target:self
selector:#selector(handleTimer: )
userInfo:nil
repeats:NO];
}
- (void)didReceiveMemoryWarning
{
NSLog(#"%s", __PRETTY_FUNCTION__);
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
[self.mWebView reload];
}
#end
Trouble:
I use for testing iPad Air (A1474) and used two websites: http://www.bild.de and http://www.spiegel.de. After ca. 30 minutes crashes the app because of memory usage. The app use more than 300Mb.
I found more solutions to handle the memory leak trouble and integrate them in my code:
- (void)freeMemory
{
[self.mWebView loadHTMLString:#"" baseURL:nil];
[self.mWebView stopLoading];
[self.mWebView setDelegate:nil];
[[NSURLCache sharedURLCache] removeAllCachedResponses];
[[NSURLCache sharedURLCache] setDiskCapacity:0];
[[NSURLCache sharedURLCache] setMemoryCapacity:0];
}
- (void)webViewDidFinishLoad: (UIWebView *)webView
{
// Clear cache
[[NSUserDefaults standardUserDefaults] setInteger:0 forKey:#"WebKitCacheModelPreferenceKey"];
}
- (void)didReceiveMemoryWarning
{
[super didReceiveMemoryWarning];
[self.mWebView reload];
}
But the solutions do not take effect. The app do not run longer than a hour.
Have somebody a solution how I can reach a app running time for at least a day for every?
Thanks in advance for suggestions.