UITextView添加Placeholder(swift)

概述UITextView添加Placeholder(swift) by 伍雪颖 添加UILabel并初始化 public let placeholderLabel: UILabel = UILabel() @IBInspectable public var placeholder: String = "" {         didSet {             placeholderLabel. UITextVIEw添加Placeholder(swift) by 伍雪颖
添加UILabel并初始化
publicletplaceholderLabel:UILabel=UILabel()
@IBInspectable public var placeholder: String = "" {
dIDSet {
placeholderLabel.text = placeholder
}
}

@IBInspectable public var placeholdercolor: UIcolor = UIcolor(red: 0.0,green: 0.0,blue: 0.0980392,Alpha: 0.22) {
dIDSet {
placeholderLabel.textcolor = placeholdercolor
}
}
overrIDe public var Font: UIFont! {
dIDSet {
placeholderLabel.Font = Font
}
}

overrIDe public var textAlignment: NSTextAlignment {
dIDSet {
placeholderLabel.textAlignment = textAlignment
}
}
addSubvIEw添加上去
overrIDe init(frame: CGRect,textContainer: NSTextContainer?) {
super.init(frame: frame,textContainer: textContainer)
commonInit()
}

required public init(coder aDecoder: NSCoder) {
super.init(coder: aDecoder)
commonInit()
}

func commonInit() {
NSNotificationCenter.defaultCenter().addobserver(self,
selector: "textDIDChange",
name: UITextVIEwTextDIDChangeNotification,
object: nil)

placeholderLabel.Font = Font
placeholderLabel.textcolor = placeholdercolor
placeholderLabel.textAlignment = textAlignment
placeholderLabel.text = placeholder
placeholderLabel.numberOflines = 0
placeholderLabel.backgroundcolor = UIcolor.clearcolor()
placeholderLabel.setTranslatesautoresizingMaskIntoConstraints(false)
addSubvIEw(placeholderLabel)
}

输入文字消失的事件
overrIDe public var text: String! {
dIDSet {
textDIDChange()
}
}

func textDIDChange() {
placeholderLabel.hIDden = !text.isEmpty
} 总结

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