Adjust font size in UITextView on screen of different size

Question

I have a UITextView with some texts. I want the big screen has bigger font size but the format is same. How can I do this?

Answer 1

I know it's a bit more advanced than the code-only solutions you've already found here, but I would encourage you to take some time and read about Adaptive Layouts: it's the future of UI development for different screens on iOS.

For instance, you can target different screen sizes and orientations using size classes. You can get an overview here: width & height traits .

Here are a few pointers if you need to begin from zero:

• Apple - Adaptive User Interfaces
• Apple - Adaptivity and Layout
• Ray Wenderlich - Beginning Adaptive Layout Tutorial
• Tuts+ - An Introduction to Adaptive Design
• Adaptive Layouts for iPhone 6

Answer 2

You can detect the screen size of the device using UIScreen.mainScreen().bounds.height and depending on the screen size you are you set a different font size.

See example below:

let screenHeight = UIScreen.mainScreen().bounds.height

switch screenHeight {
case 480: // 3.5 inch
    UIFont(name: "Helvetica", size: 16)
case 568: // 4 inch
    UIFont(name: "Helvetica", size: 17)
default: // rest of screen sizes
    UIFont(name: "Helvetica", size: 20)
}

Here you can check out the screen sizes here

Answer 3

Here are all screen sizes :)

let screenWidth = self.view.frame.size.width

switch screenWidth {
        case 320: // iPhone 4 and iPhone 5
            label.font = UIFont(name: "Avenir-Book", size: 16)
        case 375: // iPhone 6
            label.font = UIFont(name: "Avenir-Book", size: 18)
        case 414: // iPhone 6 Plus
            label.font = UIFont(name: "Avenir-Book", size: 20)
        case 768: // iPad
            label.font = UIFont(name: "Avenir-Book", size: 25)
        default: // iPad Pro
            label.font = UIFont(name: "Avenir-Book", size: 30)
        }