I am trying to display a pdf in a UIWebview using the entire screen of the device, except the status bar and top bar. So far, I created IBOutlet UIWebview *webview; in my .h file. I connected the webview in my storyboard and wrote the following code in my .m file:
- (void)viewDidLoad
{
[super viewDidLoad];
webview = [[UIWebView alloc] initWithFrame:CGRectMake(0, 0, 320, 460)];
webview.scalesPageToFit = YES;
webview.autoresizesSubviews = YES;
webview.autoresizingMask=(UIViewAutoresizingFlexibleHeight | UIViewAutoresizingFlexibleWidth);
[webview setBackgroundColor:[UIColor clearColor]];
NSString *path = [[NSBundle mainBundle] pathForResource:#"Chart" ofType:#"pdf"];
NSURL *targetURL = [NSURL fileURLWithPath:path];
NSURLRequest *request = [NSURLRequest requestWithURL:targetURL];
[webview loadRequest:request];
[self.view addSubview:webview];
}
The pdf displays correctly in my 3.5 inch, but in my 4 inch display, the bottom is cut off. This is even more noticeable when I rotate to landscape view. About 33% of the screen is not used at all. How can I fix this? I know it must have something to do with the UIWebview dimensions in my code above (webview = [[UIWebView alloc] initWithFrame:CGRectMake(0, 0, 320, 460)];), but is there a better way to simply display the webview on the entire screen, without specifying a specific screen height and width?
One cheap thing to do would be to set the frame of the webview in overriding - (void)viewDidLayoutSubviews
- (void)viewDidLayoutSubviews {
webView.frame = CGRectMake(0, 0, self.view.frame.size.width, self.view.frame.size.height);
}
the advantage of doing it here, is that the size and orientation of the view has already been determined here, and you can get an accurate measurement.
Using Auto Layout
Be sure the "Constrain to margins" option is not checked, all constrain values are 0:
And your webview is a first child of your main view:
Without Auto Layout
Change webview autosizing connections:
After a lot of headache dealing with compatibility of iOS6, 7 and different screen sizes, I use this one:
- (void)viewDidLoad {
[super viewDidLoad];
self.webview = [[UIWebView alloc] init];
// More setting your webview here
// Set webview to full screen
self.view = self.webview;
[self.webview loadRequest:aRequest];
}
I was able to get this working correctly for me by selecting the Reset to Suggested Constraints under the Resolve Auto Layout Issues menu.
Related
I have an old iOS project using Objective C. When I add a WKWebView to a ViewController
NSURL *url = [NSURL URLWithString:#"https://www.google.com"];
WKWebViewConfiguration *theConfiguration = [[WKWebViewConfiguration alloc] init];
_webView = [[WKWebView alloc] initWithFrame:CGRectZero configuration:theConfiguration];
[self.view addSubview:_webView];
self.webView.translatesAutoresizingMaskIntoConstraints = NO;
[NSLayoutConstraint activateConstraints:#[
[self.webView.topAnchor constraintEqualToAnchor:self.view.topAnchor],
[self.webView.leftAnchor constraintEqualToAnchor:self.view.leftAnchor],
[self.webView.rightAnchor constraintEqualToAnchor:self.view.rightAnchor],
[self.webView.bottomAnchor constraintEqualToAnchor:self.view.bottomAnchor]
]];
[_webView loadRequest:[NSURLRequest requestWithURL:url]];
If I install app via Xcode with iOS 14, webview works fine, but after I disconnect Xcode and open app directly, webview show content with wrong frame. If I build app in iOS 12.5 via Xcode, web view also show content with wrong frame.
If I create new project from Xcode 12.5, and using same code, it works fine.
This is screenshot when open app via Xcode build
https://i.stack.imgur.com/rYb3M.png
And this is screenshot when open app directly:
https://i.stack.imgur.com/4q0uD.png
A few observations -
This code uses a mix of _webView and self.webView. For clarity, you should unify the usage for at least this code block.
Where exactly are you calling this part? viewDidLoad() or After some event? Can you try adding a layoutIfNeeded() call after you add this?
/// After activating constraints
[self.view layoutIfNeeded];
You should try to use leadingAnchor & trailingAnchor instead of leftAnchor & rightAnchor respectively.
If nothing helps, I think your view controller's view storyboard setup isn't updated to use Autolayout. In that case, you can try this -
_webView = [[WKWebView alloc] initWithFrame:self.view.bounds configuration:theConfiguration];
_webView.autoresizingMask = (UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleHeight);
[self.view addSubview:_webView];
Please note that in this case - you MUST REMOVE all the constraints related code.
/*
self.webView.translatesAutoresizingMaskIntoConstraints = NO;
[NSLayoutConstraint activateConstraints:#[ ...... ]];
*/
After spending a few days searching, I finally found the cause of the error.
In a UIView Extension file overridden center property
#import <UIKit/UIKit.h>
#interface UIView (FrameExtension)
#property CGPoint center;
#end
.
#import "UIView+FrameExtension.h"
#implementation UIView (FrameExtension)
- (CGPoint)center {
return CGPointMake(self.frame.origin.x + self.frame.size.width / 2,
self.frame.origin.y + self.frame.size.height / 2);
}
- (void)setCenter:(CGPoint)center {
CGRect frame = self.frame;
frame.origin = CGPointMake(center.x - self.frame.size.width / 2,
center.y - self.frame.size.height / 2);
self.frame = frame;
}
#end
Somehow, when loading the webview, it called setCenter which caused the error.
We are trying to create a simple app in xcode 5 targeting ios 7. We want to create a simple webview but we do not care to use the storyboard to set the whole thing up.
Is it possible to create a webview (and set the proportions/position) by only using a code snippet?
Thanks.
You just need to create a UIWebView instance and add it to a container view. You can defined the container view in code, a nib, or a storyboard.
CGRect frame = CGRectMake(0, 0, 100, 100); // Give the frame a position and size
UIWebView *webView = [UIWebView alloc] initWithFrame:frame];
[containerView addSubView:webView];
[webView loadRequest:[NSURLRequest requestWithURL:[NSURL urlWithString:#"http://www.google.com"]]];
I tried every permutation known to mankind and I cannot get a UIWebView to size properly in a modal form view for the iPad. The web page still displays the full iPad portrait width of 768 points.
Where and how do I tell UIWebView to display width 540 points?
I thought 'scalesPageToFit' is supposed to do this but it does not work.
I tried setting the web view to the size of form view which is 540 x 576 with navigation and status bar. Height is irrelevant though.
I tried adding a UIWebView to a UIView in a storyboard with all resizing set. I then removed the UIWebView and added it programmatically.
- (void)viewDidLoad
{
[super viewDidLoad];
CGRect aFrame = self.view.frame;
if (IS_IPAD)
{
aFrame = CGRectMake(0, 0, FORM_VIEW_WIDTH, FORM_VIEW_HEIGHT);
}
_webView = [[UIWebView alloc] initWithFrame:aFrame];
[_webView setOpaque:NO];
[_webView setDelegate:self];
[_webView setScalesPageToFit:YES];
self.view = _webView;
...
}
I also tried loading in viewDidAppear (in addition to viewDidLoad, viewWillAppear, etc.)
- (void)viewDidAppear:(BOOL)animated
{
[super viewDidAppear:animated];
[[self webView] setFrame:CGRectMake(0, 0, FORM_VIEW_WIDTH, FORM_VIEW_HEIGHT)];
[[self webView] setScalesPageToFit:YES];
NSURL *webURL = [NSURL URLWithString:#"http://www.google.com"];
NSURLRequest *request = [NSURLRequest requestWithURL:webURL cachePolicy:NSURLRequestUseProtocolCachePolicy timeoutInterval:5.0f];
[[self webView] loadRequest:request];
}
Any recommendations appreciated.
This keeps happening to me. I post a lengthy question, then two seconds later I find the answer.
Anyway, someone posted a solution to this problem here:
UIWebView -- load external website, programmatically set initial zoom scale, and allow user to zoom afterwards
However, I altered the script to set the width to the iPad width:
- (void)webViewDidFinishLoad:(UIWebView *)webView
{
NSString* js =
#"var meta = document.createElement('meta'); "
#"meta.setAttribute( 'name', 'viewport' ); "
#"meta.setAttribute( 'content', 'width = 540px, initial-scale = 1.0, user-scalable = yes' ); "
#"document.getElementsByTagName('head')[0].appendChild(meta)";
[[self webView] stringByEvaluatingJavaScriptFromString: js];
}
Note the portion 'width = 540px, initial-scale = 1.0, user-scalable = yes'
I changed the width to the form width and scale to 1.0.
I also need to handle iPhone, and so I will make adjustments for that next. I think this fix may only be needed for the iPad form view.
UPDATE: Answer is short-lived. If I load any other page the sizing is thrown off again. Back to square one.
SOLUTION: This view will only need to access a few web pages that I developed. Therefore, I updated the few web pages that I need to access by adding the meta tag to each of them. I only need to access these pages and so this is the solution I plan to go with. This means I need to set the viewport width to 540px only for iPad somehow. I will figure that out next.
<meta name="viewport" content="width:540, initial-scale=1, maximum-scale=1">
This piece of code dispalys a document in a scrollable UIWebView:
- (void)viewDidLoad
{
[super viewDidLoad];
_myWebView = [[UIWebView alloc] initWithFrame:CGRectMake(0, 0, 320, 760)];
NSURL *myUrl = [NSURL URLWithString:#"http://pathToDoc/myDoc.doc"];
NSURLRequest *myRequest = [NSURLRequest requestWithURL:myUrl];
[_myWebView loadRequest:myRequest];
[self.view addSubview:_myWebView];
}
This works fine except when trying to display a landscape document which has been created with custom margins which are smaller than standard.
The result is the contents of the right-hand edge of the document are chopped off.
Is there any way to display the whole document?
Well, after several months of frustration with this (can barely believe how long it took!), it turned out to need only a single line of code to solve the problem.
_documentWebView.autoresizingMask = UIViewAutoresizingFlexibleWidth;
Add that just after the last line and suddenly all is well in the world.
I'm trying to create an app to display various document formats and have the following code in a ViewController.m file:
- (void)viewDidLoad
{
[super viewDidLoad];
self.scrollView = [[UIScrollView alloc] initWithFrame:CGRectMake(0, 0, 768 , 1024)];
[self.view addSubview:scrollView];
self.webView = [[UIWebView alloc] initWithFrame:CGRectMake(0, 0, 768 , 1024)];
[scrollView addSubview:webView];
[webView loadRequest:service.urlRequest];
}
The trouble is, the app is only to be used in portrait mode and one of the Word documents is 1024 wide. I'd like to be able to scroll horizontally to see the whole document but this doesn't work.
I think I need to implement some setting on the scrollview but so far haven't been able to figure out what it is.
I've tried setting the width of both the scrollView and webView widths to 1024 and scrollView.contentSize.width but appear to be barking up the wrong tree.
I've also tired self.scrollView.contentSize = CGSizeMake(1024, 1024); but feel as though I'm just trying various things in an almost random manner to see if one works.
Can anyone tell me how to implement this?
WebView.autoresizingMask = UIViewAutoresizingFlexibleWidth;