去除 UITextView 粘贴动画

在iOS11, iOS12上UITextView会有个奇怪的动画

之前

这个动画看起来很难受，特别是文本比较多的时候，所以还是把它去除掉吧

之后

class SKTextView: UITextView {

    override init(frame: CGRect, textContainer: NSTextContainer?) {
        super.init(frame: frame, textContainer: textContainer)
        
        pasteDelegate = self
    }
    
}

extension SKTextView: UITextPasteDelegate { 
    
    func textPasteConfigurationSupporting(_ textPasteConfigurationSupporting: UITextPasteConfigurationSupporting, shouldAnimatePasteOf attributedString: NSAttributedString, to textRange: UITextRange) -> Bool {
        return false
    }
}

解释: 在合适的地方去实现一下UITextView的pasteDelegate即可，比如自定义的UITextView子类