Memory leak in UIWebView - ios

Question

I have a head(butt)ache last two days. A dodgy memory leak makes me Hulk.
A lot of leaks appear after loading any url request in custom UIWebView when profiling code on the simulator. But if I use a device like iPhone 5 there is just one leak.
The huge trouble is that Instruments does not show any line of my code.
I remember as I saw a great video tutorial to locate these leaks, but googling has no result in two days :(
Here is a simple project for Xcode 5, it leaks when webView property loaded an url request.
Screenshots: one, two.
UPD: Added whole code.
UPD2: Tiny refactoring.
#import "AKViewController.h"
#interface AKViewController ()
#property (nonatomic, strong, readonly) UIWebView *webView;
#end
#implementation AKViewController
#synthesize webView = _webView;
#define MARGIN_WEB_VIEW_X 15.0f
#define MARGIN_WEB_VIEW_TOP 30.0f
#define MARGIN_WEB_VIEW_BOTTOM 25.0f
#pragma mark - Private methods
- (CGRect)makeRectForWebView {
CGRect appFrame = UIScreen.mainScreen.applicationFrame;
CGRect rectWebView = CGRectMake(MARGIN_WEB_VIEW_X,
MARGIN_WEB_VIEW_TOP,
appFrame.size.width - MARGIN_WEB_VIEW_X * 2,
appFrame.size.height - MARGIN_WEB_VIEW_BOTTOM);
return rectWebView;
}
- (void)presentViews {
[self.view.subviews makeObjectsPerformSelector:#selector(removeFromSuperview)];
self.webView.frame = [self makeRectForWebView];
[self.view addSubview:self.webView];
}
- (NSURLRequest *)makeLoginURLRequest {
NSString *stringUrl = #"http://google.com/";
NSURL *url = [NSURL URLWithString:[stringUrl stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding]];
NSURLRequest *request = [NSURLRequest requestWithURL:url];
return request;
}
#pragma mark - Properties
- (UIWebView *)webView {
if (!_webView) {
_webView = [[UIWebView alloc] initWithFrame:UIScreen.mainScreen.applicationFrame];
_webView.scalesPageToFit = YES;
}
return _webView;
}
#pragma mark - Lifecycle
- (void)viewDidAppear:(BOOL)animated {
[super viewDidAppear:animated];
[self presentViews];
}
- (void)viewDidLoad {
[super viewDidLoad];
self.view.backgroundColor = [UIColor grayColor];
[self.webView loadRequest:[self makeLoginURLRequest]];
}
#end
HELP!

Answer 1

I don't know if you're showing all of the code, so I'm going to guess that you may not be releasing the web view's delegate. The documentation for the UIWebView delegate property says:
Important: Before releasing an instance of UIWebView for which you
have set a delegate, you must first set its delegate property to nil.
This can be done, for example, in your dealloc method.