ios - Text View 在 Placeholder Swift 中插入图像

Question

如何在我的占位符“(在此处)在此输入可选文本...”中插入图像？

@IBOutlet var textView : UITextView!
var placeholderLabel : UILabel!

override func viewDidLoad() {
    textView.delegate = self
    placeholderLabel = UILabel()
    placeholderLabel.text = "Enter optional text here..."
    placeholderLabel.font = UIFont.italicSystemFontOfSize(textView.font.pointSize)
    placeholderLabel.sizeToFit()
    textView.addSubview(placeholderLabel)
    placeholderLabel.frame.origin = CGPointMake(5, textView.font.pointSize / 2)
    placeholderLabel.textColor = UIColor(white: 0, alpha: 0.3)
    placeholderLabel.hidden = countElements(textView.text) != 0
}

func textViewDidChange(textView: UITextView) {
    placeholderLabel.hidden = countElements(textView.text) != 0
}

Answer 1

leftView 可以满足您的需求在场上。将自己设置为该领域的代表并在textField:shouldChangeCharactersInRange:replacementString: 当新文本为空时设置一个UIImageView作为leftView，当新文本的长度大于时清除它0.

要获取新文本，请使用 var newText:NSString = self.projectSearchTxtFld.text.stringByReplacingCharactersInRange(range, withString: string)。