Ios uiscrollview

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

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:.

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. 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. In landscape mode, the content can scroll vertically especially when the keyboard covers up most of the view. Now add some constraints to your scroll view to place it where you want it in your main view.

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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.

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. Don't paste the snippet below. Instead, go to your view controller, and add the UIScrollViewDelegate in the same place that's shown in the snippet. This is telling the scroll view to call the view controller with the scroll view event methods. Choose the event that you want, and add the function to your view controller file.

Ios uiscrollview

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. Continue using the iPhone 8 simulator for the rest of the tutorial. Open Main. Then, move Image View inside your newly-added Scroll View.

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Jeremy says:. Now items is a crazy big number, so I would suggest some of the other options. I have also been writing online for some time now, a process I find enjoyable and challenging, for, at times, it is when you have to explain something to someone, that you find there is still a lot to learn. I also check to see if the whole textview is in the visible area, rather than just its point origin. Hello, Aman, Your question is old, but I am answering in case another person needs to find the answer. The labels are only there so that we have a populated scroll view when we run the app. Bipin maurya says:. 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. To do this, click on the view controller, select the size inspector, and select Freeform size. However this part is the most confusing because Apple has repurposed the constraints in this case to indicate to the UIScrollView the boundaries of your content and therefore calculate the content size.

I love building tools with software, and that is why I am currently the Lead Developer for Green 13 Solutions. I ran into some challenges when I was trying to create a scene where users can scroll to see content that overflows in the current content view.

When in portrait mode, the content will not scroll until the keyboard covers up the bottom of the view. February 9, Perhaps you have an explicit width or height that is not marked as placeholder. But some applications require a more flexible behavior when dealing with tap-to-zoom functionality, an example of this is the Maps application. Place it to the left of the scroll view. Now we need to register for keyboard notifications. Use it to set the width of your content if you are scrolling vertically , or use it to set the height if scrolling horizontally. Thanks for the clear article and also for keeping it up-to-date with the changes since it was originally written. In Main. Todd Aspeotis says:. In the Foreground scroll view, there are some labels added to it and a container view. I think I just woke up the neighbors with a loud cheer of joy! This tutorial finally help me to get the job done. March 21, This method calculates the zoom scale for the scroll view.