That way I just use that button type when I want custom behavior and it just works. However, for customizations like this I prefer to create a subclass of UIButton. With that category in place, you CAN set the border color of a layer from IB as described above. The setBorderUIColor method takes a UIColor as input and uses it to change the CGColor on a layer. Returns the preferred symbol configuration for a button state. Make sure you modify it before pass it to UIButton since struct is value type. It adds a method to CALayer called setBorderUIColor. A control that executes your custom code in response to user interactions. You can customize your button by modifying a UIButton.Configuration property. I added a category called CALayer+setUIColor. That doesn't work because IB's "color" setting specifies a UIColor, and layers want a CGColor. Select the "identity inspector." Open the "User Defined Runtime Attributes" section if it isn't already, click the "+" button underneath, and add "layer.borderwidth" as a key, make it a number, and enter a value of 1, enter a key of "rnerRadius" and a value of 8.) The only thing you can't do directly with "User Defined Runtime Attributes" is adjust the border color to the light gray color that Apple's buttons use. You can also use "User Defined Runtime Attributes" on each button in IB to change most of those settings on a button-by-button basis. However you then need to do it for every button that you want to customize. The Image shows the plus from SF Symbols.Instead of subclassing UIButton you can add custom code that grabs a button and manipulates it's layer. In this example, we’ll add a trailing Button holding an Image. We can use the view modifier navigationBarItems to add leading and trailing views to it. Tapping the plus icon presents a sheet with a form. If you know a better way, please let me know! We will create a Navigation View with a plus icon. I somehow expect SwiftUI to be smart enough to handle it because the pattern is so common. I’ve found a way to fix it, but because I’m still new to SwiftUI, I don’t know if that’s the right way. The first is that you might find the + button really hard to tap, because whereas UIKit extends the tappable area to make it easier to interact with SwiftUI does not, so you need to tap exactly on the +. For example, a UI button that would have sent feedback email using a mailto URL might instead open a web-based feedback form using an https URL on failure. Two SwiftUI glitches might affect you while following along, depending on which Xcode version you’re using. Paul Hudson writes about this in Creating books with Core Data on November 16th 2019: We’ll change it to 44 ✕ 44 which is much easier to tap on The plus button in a Navigation Bar has a default size of 18 ✕ 18 which is too small to tap on. Visually it looked okay, but the tap area was too small to actually trigger an action. The problem: When running the app on my iPhone, I’ve noticed that the button was simply too small to tap on. This is a very common design pattern for adding items, such as calendar events, alarms, or anything that could be stored in an Array, Set or Core Data Model. One of the first things I wanted to do in SwiftUI was to place a plus icon (+) in a Navigation Bar. To learn more about SwiftUI I recommend to start reading 100 days of Swift How to increase the tap area of icons in a SwiftUI Navigation Bar
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