Suragch Suragch - 6 months ago 229
Swift Question

Assertion failure in UITextView _firstBaselineOffsetFromTop

I was learning about the view debugger in Xcode and capturing the view hierarchy with Debug > View Debugging > Capture View Hierarchy. However when I tried it in my app I got the following error:


Assertion failure in -[UITextView _firstBaselineOffsetFromTop], /BuildRoot/Library/Caches/com.apple.xbs/Sources/UIKit_Sim/UIKit-3512.60.7/UITextView.m:1683


I could reproduce this in the following simple project:

import UIKit
class ViewController: UIViewController {

override func viewDidLoad() {
super.viewDidLoad()

let myTextView = UITextView()
myTextView.frame = CGRect(x: 50, y: 50, width: 200, height: 100)
myTextView.text = "This is a test."
view.addSubview(myTextView)

}
}


I saw here that it could be caused by not using auto layout. Is this really a bug that we have to wait for a fix? Is there a Swift workaround?

Update

The suggested duplicate looks like the same issue I am having. However, unlike that question, I am asking for a Swift workaround. The "answer" to that question was just a link (the same link that I already had above). If these are still to be considered duplicate questions, then can I be so bold as to ask that the other one be marked as the duplicate of this one?

Answer

Note do this in DEBUG builds only

A workaround to resolve this issue. Keep below category in your project. It worked for me.

@interface UITextView(ZCTextView)

@end

@implementation UITextView (ZCTextView)
- (void)_firstBaselineOffsetFromTop {

}

- (void)_baselineOffsetFromBottom {

}

@end

For swift

extension UITextView {
    func _firstBaselineOffsetFromTop() {
    }
    func _baselineOffsetFromBottom() {
    }
}
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