nslayoutconstraint

I'm trying to add a UISlider to my view programmatically including constraints so that its width adapts to the whole screen width. This is what I got so far: //2 Add UISlider self.slider = [[UISlider alloc] init]; [self.view addSubview:self.slider]; [self.view addConstraint:[NSLayoutConstraint constraintWithItem:self.slider attribute:NSLayoutAttributeLeft relatedBy:NSLayoutRelationEqual toItem:self.view attribute:NSLayoutAttributeLeft multiplier:1 constant:0]]; [self.view addConstraint:[NSLayoutConstraint constraintWithItem:self.slider attribute:NSLayoutAttributeRight relatedBy

I successfully added a WKWebView programmatically In a viewController (in viewDidLoad() ). When loading a url that contains a video it appears fine, but when I try to tap on it (playing it), I cannot see it, but the audio works fine. The weird thing is I created a new project just to make sure it should works fine and it did, I copied the same exact code the webView displayed the video as it should. It was working fine before converting to Swift 3. This is how it looks when tapping on the video: Before tapping: After Tapping: I also tried another web page: Before tapping: After Tapping (Note

I'm developing an app with a target of iOS7, and I get the following error when I deploy the app to an iPhone 4. [NSLayoutConstraint setActive:]: unrecognized selector sent to instance I looked into this and it turns out that setActive was introduced in iOS8. Question is, what is the alternative to setActive for constraints, circa iOS7? I need to manipulate the constraints programmatically and can't seem to find the answer anywhere. Another way to do this would be to add/remove the constraint from the view: [myView addConstraint:constraint]; [myView removeConstraint:constraint]; This has been

In the docs about the visual format language for NSLayoutConstraint there is an example where you specify button1 is equal in width to button2: [button1(==button2)] my question: is there a way to make button1 equal to button 2's with + a constant.. I tried: [button1(==button2+10)] and [button1(==(button2+10))] and both failed.. here is an error example: A predicate on a view's thickness must end with ')' and the view must end with ']' V:[tagWrapper(==tagButton+10)] ^' (I obviously know you can do this by doing an NSStringWithFormat and simply filling in the variable in question.. but that

To illustrate my problem, I created the following graphic: The black border around the red square is supposed to be the iPhone screen. Inside, we have in red a UIScrollView , which is taller than the screen. It is, in fact, as tall as a UIWebView , displayed above in yellow. The UIWebView is a subview of the UIScrollView , with scrolling disabled. Further more, we have two blue views, which I like to call the header and footer views. They are also subviews of the UIScrollView , but outside of the scrollable bounds. My problem now is : How do I configure the auto layout constraints for this? I