Ios uiscrollview

This tutorial assumes you understand how to use Interface Builder to add objects and connect outlets between your code and storyboard scenes, ios uiscrollview.

Scroll views have two main purposes:. Scroll views are created as any other view is, either programmatically or in Interface Builder. After that, only a small amount of additional configuration is required to achieve basic scrolling capabilities. A scroll view is created and inserted into a controller or view hierarchy like any other view. There are only two additional steps required to complete the scroll view configuration:. You can optionally configure any visual cues your application requires like vertical and horizontal scroll indicators, drag bouncing, zoom bouncing, and directional constraint of scrolling.

Ios uiscrollview

UIScrollView has gone through some major improvements. Starting with iOS 11, Apple introduced content and frame layout guides to make it a little less confusing to configure the content inside of your scroll view. Xcode 11 also added these layout guides to interface builder. I will also show you how the scroll view can move your content out of the way of the pop-up keyboard. Are you working on a project that cannot target iOS 11 yet? No worries. I want to give you a sense of what we are building, so you can follow along and see how the view is constructed. I created a view with some labels, text fields, and an image. If you want to see the finished project, I put the entire project on GitHub. Here is what it should look like in portrait and landscape:. For demo purposes, I colored the scroll view with a yellow background and the content inside with a blue background. When in portrait mode, the content will not scroll until the keyboard covers up the bottom of the view.

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Since the introduction of Auto Layout to iOS, there is a new way you can configure your scrolling content. With Auto Layout, the amount of code you have to write is greatly reduced. One of the big pain points with the old way of setting up a UIScrollView was communicating the content size to the scroll view. It was fairly straightforward to calculate your content size if the content in the UIScrollView was an image. But it was not as easy if your scroll view included a mixed bag of buttons, labels, custom views, and text fields. Lengthy code adjustments were needed to reflect constant changes in device rotations and phone size differences.

In order to make the UIScrollView scroll, you have to manually tell it how tall and wide the content is. Before you can do that, you must create an outlet, as shown below. If you want to embed a tall image into the scrollView, then you can set the contentSize to the size of the image, as below. This assumes that you've also created an outlet for the Image View and added it as a subview of the scroll view. Create a comma-delimited list of all the delegates that your view controller supports.

Ios uiscrollview

Since the introduction of Auto Layout to iOS, there is a new way you can configure your scrolling content. With Auto Layout, the amount of code you have to write is greatly reduced. One of the big pain points with the old way of setting up a UIScrollView was communicating the content size to the scroll view. It was fairly straightforward to calculate your content size if the content in the UIScrollView was an image. But it was not as easy if your scroll view included a mixed bag of buttons, labels, custom views, and text fields. Lengthy code adjustments were needed to reflect constant changes in device rotations and phone size differences. I will also show you how the scroll view can move your content out of the way of the pop-up keyboard. I want to give you a sense of what we are building so you can follow along and see how the view is constructed. I created a view with some labels, text fields, and an image. If you want to follow along, I put the entire project on GitHub.

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Set it as the initial view controller by either dragging the Storyboard Entry Point arrow from the other view controller, or by selecting the new view controller and checking the Is Initial View Controller checkbox in the Attributes Inspector. If you set it to greater than 1, the image may appear blurry when the user zooms in on it. I searched for 3 days through different tutorials to find an answer to this including posting 2 questions to stackoverflow and read this tutorial through 1 time and finally understood how to accomplish this. January 12, Finally, add an outlet to your scroll view and implement the keyboard notification selectors. In the viewDidLoad function, add the view controller as an observer. Look at the section titled Pure Auto Layout Approach and read the third bullet. November 18, March 29, On running the app, it will start off with the same scale factor as previously shown zoomScale of 1. With this view controller selected, go to the Size Inspector and change its Simulated Size to Freeform and set its height to

This tutorial assumes you understand how to use Interface Builder to add objects and connect outlets between your code and storyboard scenes. Use the Download Materials button at the top or bottom of this tutorial to download the starter project, then open it in Xcode.

As the final step, I check to see if the active text field is visible and scroll the field into view if it is not. Make sure you have constraints attached to all four sides of the content view so that it will expand to the size of your content. Greg Michaelson says:. That class will be responsible for tracking the number of fingers on the screen and the tap count. Hold down the shift key to select multiple constraints in this dialog. November 19, Rupesh says:. The Background scroll view has an image view with all its edges pinned to the scroll view with no padding. But it was not as easy if your scroll view included a mixed bag of buttons, labels, custom views, and text fields. Therefore I need to set the width of my single content view to be the width of the scroll view. We do this to make sure that the active field is visible when the keyboard pops up. Josep says:. Look at the section titled Pure Auto Layout Approach and read the third bullet. This can be done in IB.