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This time we are going to look into how to embed custom view in UIScrollView and setting up autolayout constraints for different scenarios. Setting up view controller with scroll view We'll gonna create a new view controller what contains UIScrollView as it's subview. UIScrollView will cover the whole view area. Everything is set up in …
Let's see how to replace multiple tokens in string. As an example problem to solve we will use this string:The quick <color_1> <animal_1> jumps over the lazy <animal_2> String extension for replacing tokens Token's format is < text _ numbers > what can be turned into regular expression: <[:alpha:]+_{1}[:digit:]+>. We'll extend string and add a …
Property wrappers allow property declaration to state what kind of property wrapper is used for implementing the property. We can use it for implementing transformations on properties like validating if string is email or not. This is what we will do: creating a property wrapper for email properties and validating emails using NSDataDetector. If value …
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When writing code in Swift it is often needed to observe changes in other objects. We can use Apple's key-value observation but it has some implications: requires to use NSObject and dynamic dispatch through Objective-C runtime. This time, let's build a simple key-value observation in Swift what does not require to use NSObject at all. …
Continue reading "Key-value observing without NSObject and dynamic modifier in Swift"
iOS 13 added a new class named UIContextMenuInteraction what is used for attaching menus to views. When adding menu interaction to a view and user uses 3D Touch or long press gesture on devices not supporting it, a menu is presented alongside with the highlighted content view. Therefore depending on the available space, not all …
Continue reading "Displaying menus with UIContextMenuInteraction on iOS"
