CODEWITHSUNDEEP
iosswiftxcode
user172902
user172902

Reputation: 3581

Custom TextView blocking main thread

I have a custom text view with round corner radius. After testing in instrument, I am finding that it takes 53ms to initialize it (or is it?). I thought 53ms is bit much for one UI component so I was wondering if there is a faster way of doing it? Below are my instrument output and customTextView code.

import UIKit

class CustomTextView: UITextView {

    private func initialize() {
        self.layer.borderColor = UIColor(red: 225.0/255, green: 225.0/255, blue: 225.0/255, alpha: 1).CGColor
        self.layer.borderWidth = 1.0
        self.layer.cornerRadius = 5
    }

    required init?(coder aDecoder: NSCoder) {
        super.init(coder: aDecoder)
        initialize()
    }
}

timeProfile

Upvotes: 1

Views: 125

Answers (1)

Oleg Gordiichuk
Oleg Gordiichuk

Reputation: 15512

I do some investigation about that :

Initial time is 83 millisecond.

enter image description here

Firstly if we do some calculation for layer it will save you 1 millisecond so it is 82 millisecond.

 private func initialize() {
        self.layer.borderColor = UIColor(red: 0.88, green: 0.88, blue: 0.88, alpha: 1).CGColor
        self.layer.borderWidth = 1.0
        self.layer.cornerRadius = 5
    }

After disabling of the initialize() method it is 75 millisecond.

enter image description here

So let just test regular UITextView and we see that it is 82 seconds

enter image description here

Conclusion it is normal init time for UI element.

Upvotes: 1

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