CODEWITHSUNDEEP
objective-cxcodemacoscocoa
小弟调调
小弟调调

Reputation: 1333

I added a WebView to my Cocoa app and it's generating an error

I added a WebView to my app and I'm loading a page into it using this code:

-(void)awakeFromNib{
    NSString *resourcesPath = [[NSBundle mainBundle] resourcePath];
    NSString *htmlPath = [resourcesPath stringByAppendingString:@"/calendarHTML/test.html"];
    [[webView mainFrame] loadRequest:[NSURLRequest requestWithURL:[NSURL fileURLWithPath:htmlPath]]]; 
}

However, when I run the app I receive the following error:

Layout still needs update after calling -[WebHTMLView layout].  
WebHTMLView or one of its superclasses may have overridden 
-layout without calling super. Or, something may have dirtied 
layout in the middle of updating it.  Both are programming errors in 
Cocoa Autolayout.  The former is pretty likely to arise if some 
pre-Cocoa Autolayout class had a method called layout, but it should be fixed.!

error log

What is causing this problem?

Upvotes: 11

Views: 2170

Answers (3)

Muzammil
Muzammil

Reputation: 1539

I am not sure about the case of WebView but If you are using any custom class (like subclass of UILabel) and you are using the method :

- (void)updateConstraints
{

}

then definitely It will crash your app. Best solution is to remove this method and write your required changes in 'awakeFromNib' method. Hope this help someone else who is getting this crash in custom class.

Upvotes: 0

corbin dunn
corbin dunn

Reputation: 2667

Note that you can safely ignore that log message for WebViews.

Upvotes: 3

Rob Keniger
Rob Keniger

Reputation: 46020

This is caused by the fact that the nib containing the window that you have placed the WebView into is using the new Auto Layout feature, introduced in Lion.

When a nib file has auto layout enabled, the window will call the -layout method on all NSView objects in the window.

This causes a problem with WebView because it had a method named -layout before it the method was added to the NSView API in Lion, and WebView's layout method does not understand auto layout.

Probably the best fix for the time being is to use the old autoresizing mask method of laying out the views in your window. As Xcode now creates nib files with autolayout enabled, you need to disable it yourself.

You can do that in the File inspector for your nib file, by disabling the Use Auto Layout checkbox.

interface builder inspector

After you do this, you'll need to make sure that all the views in the nib have the correct autoresizing settings in the Size tab of the view inspector.

Upvotes: 12

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