Meilleure façon d'get l'effet d'animation UILabel dans Swift?

C'est la source d'un bon projet qui réalise exactement ce que vous searchz:

  public enum EGFloatingTextFieldValidationType { case Email case Number } public class EGFloatingTextField: UITextField { private typealias EGFloatingTextFieldValidationBlock = ((text:Ssortingng,inout message:Ssortingng)-> Bool)! public var validationType : EGFloatingTextFieldValidationType! private var emailValidationBlock : EGFloatingTextFieldValidationBlock private var numberValidationBlock : EGFloatingTextFieldValidationBlock let kDefaultInactiveColor = UIColor(white: CGFloat(0), alpha: CGFloat(0.54)) let kDefaultActiveColor = UIColor.blueColor() let kDefaultErrorColor = UIColor.redColor() let kDefaultLineHeight = CGFloat(22) let kDefaultLabelTextColor = UIColor(white: CGFloat(0), alpha: CGFloat(0.54)) public var floatingLabel : Bool! var label : UILabel! var labelFont : UIFont! var labelTextColor : UIColor! var activeBorder : UIView! var floating : Bool! var active : Bool! var hasError : Bool! var errorMessage : Ssortingng! required public init(coder aDecoder: NSCoder) { super.init(coder: aDecoder) self.commonInit() } override public init(frame: CGRect) { super.init(frame: frame) self.commonInit() } func commonInit(){ self.emailValidationBlock = ({(text:Ssortingng, inout message: Ssortingng) -> Bool in var emailRegex = "[A-Z0-9a-z._%+-]+@[A-Za-z0-9.-]+\\.[A-Za-z]{2,6}" var emailTest = NSPredicate(format:"SELF MATCHES %@" , emailRegex) var isValid = emailTest.evaluateWithObject(text) if !isValid { message = "Invalid Email Address" } return isValid; }) self.numberValidationBlock = ({(text:Ssortingng,inout message: Ssortingng) -> Bool in var numRegex = "[0-9.+-]+"; var numTest = NSPredicate(format:"SELF MATCHES %@" , numRegex) var isValid = numTest.evaluateWithObject(text) if !isValid { message = "Invalid Number" } return isValid; }) self.floating = false self.hasError = false self.labelTextColor = kDefaultLabelTextColor self.label = UILabel(frame: CGRectZero) self.label.font = self.labelFont self.label.textColor = self.labelTextColor self.label.textAlignment = NSTextAlignment.Left self.label.numberOfLines = 1 self.label.layer.masksToBounds = false self.addSubview(self.label) self.activeBorder = UIView(frame: CGRectZero) self.activeBorder.backgroundColor = kDefaultActiveColor self.activeBorder.layer.opacity = 0 self.addSubview(self.activeBorder) self.label.autoAlignAxis(ALAxis.Horizontal, toSameAxisOfView: self) self.label.autoPinEdge(ALEdge.Left, toEdge: ALEdge.Left, ofView: self) self.label.autoMatchDimension(ALDimension.Width, toDimension: ALDimension.Width, ofView: self) self.label.autoMatchDimension(ALDimension.Height, toDimension: ALDimension.Height, ofView: self) self.activeBorder.autoPinEdge(ALEdge.Bottom, toEdge: ALEdge.Bottom, ofView: self) self.activeBorder.autoPinEdge(ALEdge.Left, toEdge: ALEdge.Left, ofView: self) self.activeBorder.autoPinEdge(ALEdge.Right, toEdge: ALEdge.Right, ofView: self) self.activeBorder.autoSetDimension(ALDimension.Height, toSize: 2) NSNotificationCenter.defaultCenter().addObserver(self, selector: Selector("textDidChange:"), name: "UITextFieldTextDidChangeNotification", object: self) } public func setPlaceHolder(placeholder:Ssortingng){ self.label.text = placeholder } override public func becomeFirstResponder() -> Bool { var flag:Bool = super.becomeFirstResponder() if flag { if self.floatingLabel! { if !self.floating! || self.text!.isEmpty { self.floatLabelToTop() self.floating = true } } else { self.label.textColor = kDefaultActiveColor self.label.layer.opacity = 0 } self.showActiveBorder() } self.active=flag return flag } override public func resignFirstResponder() -> Bool { var flag:Bool = super.becomeFirstResponder() if flag { if self.floatingLabel! { if self.floating! && self.text!.isEmpty { self.animateLabelBack() self.floating = false } } else { if self.text!.isEmpty { self.label.layer.opacity = 1 } } self.label.textColor = kDefaultInactiveColor self.showInactiveBorder() self.validate() } self.active = flag return flag } override public func drawRect(rect: CGRect){ super.drawRect(rect) var borderColor = self.hasError! ? kDefaultErrorColor : kDefaultInactiveColor var textRect = self.textRectForBounds(rect) var context = UIGraphicsGetCurrentContext() var borderlines : [CGPoint] = [CGPointMake(0, CGRectGetHeight(textRect) - 1), CGPointMake(CGRectGetWidth(textRect), CGRectGetHeight(textRect) - 1)] if self.enabled { CGContextBeginPath(context); CGContextAddLines(context, borderlines, 2); CGContextSetLineWidth(context, 1.0); CGContextSetStrokeColorWithColor(context, borderColor.CGColor); CGContextStrokePath(context); } else { CGContextBeginPath(context); CGContextAddLines(context, borderlines, 2); CGContextSetLineWidth(context, 1.0); var dashPattern : [CGFloat] = [2, 4] CGContextSetLineDash(context, 0, dashPattern, 2); CGContextSetStrokeColorWithColor(context, borderColor.CGColor); CGContextStrokePath(context); } } func textDidChange(notif: NSNotification){ self.validate() } func floatLabelToTop() { CATransaction.begin() CATransaction.setCompletionBlock { () -> Void in self.label.textColor = self.kDefaultActiveColor } var anim2 = CABasicAnimation(keyPath: "transform") var fromTransform = CATransform3DMakeScale(CGFloat(1.0), CGFloat(1.0), CGFloat(1)) var toTransform = CATransform3DMakeScale(CGFloat(0.5), CGFloat(0.5), CGFloat(1)) toTransform = CATransform3DTranslate(toTransform, -CGRectGetWidth(self.label.frame)/2, -CGRectGetHeight(self.label.frame), 0) anim2.fromValue = NSValue(CATransform3D: fromTransform) anim2.toValue = NSValue(CATransform3D: toTransform) anim2.timingFunction = CAMediaTimingFunction(name: kCAMediaTimingFunctionEaseOut) var animGroup = CAAnimationGroup() animGroup.animations = [anim2] animGroup.duration = 0.3 animGroup.fillMode = kCAFillModeForwards; animGroup.removedOnCompletion = false; self.label.layer.addAnimation(animGroup, forKey: "_floatingLabel") self.clipsToBounds = false CATransaction.commit() } func showActiveBorder() { self.activeBorder.layer.transform = CATransform3DMakeScale(CGFloat(0.01), CGFloat(1.0), 1) self.activeBorder.layer.opacity = 1 CATransaction.begin() self.activeBorder.layer.transform = CATransform3DMakeScale(CGFloat(0.01), CGFloat(1.0), 1) var anim2 = CABasicAnimation(keyPath: "transform") var fromTransform = CATransform3DMakeScale(CGFloat(0.01), CGFloat(1.0), 1) var toTransform = CATransform3DMakeScale(CGFloat(1.0), CGFloat(1.0), 1) anim2.fromValue = NSValue(CATransform3D: fromTransform) anim2.toValue = NSValue(CATransform3D: toTransform) anim2.timingFunction = CAMediaTimingFunction(name: kCAMediaTimingFunctionEaseOut) anim2.fillMode = kCAFillModeForwards anim2.removedOnCompletion = false self.activeBorder.layer.addAnimation(anim2, forKey: "_activeBorder") CATransaction.commit() } func animateLabelBack() { CATransaction.begin() CATransaction.setCompletionBlock { () -> Void in self.label.textColor = self.kDefaultInactiveColor } var anim2 = CABasicAnimation(keyPath: "transform") var fromTransform = CATransform3DMakeScale(0.5, 0.5, 1) fromTransform = CATransform3DTranslate(fromTransform, -CGRectGetWidth(self.label.frame)/2, -CGRectGetHeight(self.label.frame), 0); var toTransform = CATransform3DMakeScale(1.0, 1.0, 1) anim2.fromValue = NSValue(CATransform3D: fromTransform) anim2.toValue = NSValue(CATransform3D: toTransform) anim2.timingFunction = CAMediaTimingFunction(name: kCAMediaTimingFunctionEaseOut) var animGroup = CAAnimationGroup() animGroup.animations = [anim2] animGroup.duration = 0.3 animGroup.fillMode = kCAFillModeForwards; animGroup.removedOnCompletion = false; self.label.layer.addAnimation(animGroup, forKey: "_animateLabelBack") CATransaction.commit() } func showInactiveBorder() { CATransaction.begin() CATransaction.setCompletionBlock { () -> Void in self.activeBorder.layer.opacity = 0 } var anim2 = CABasicAnimation(keyPath: "transform") var fromTransform = CATransform3DMakeScale(1.0, 1.0, 1) var toTransform = CATransform3DMakeScale(0.01, 1.0, 1) anim2.fromValue = NSValue(CATransform3D: fromTransform) anim2.toValue = NSValue(CATransform3D: toTransform) anim2.timingFunction = CAMediaTimingFunction(name: kCAMediaTimingFunctionEaseOut) anim2.fillMode = kCAFillModeForwards anim2.removedOnCompletion = false self.activeBorder.layer.addAnimation(anim2, forKey: "_activeBorder") CATransaction.commit() } func performValidation(isValid:Bool,message:Ssortingng){ if !isValid { self.hasError = true self.errorMessage = message self.labelTextColor = kDefaultErrorColor self.activeBorder.backgroundColor = kDefaultErrorColor self.setNeedsDisplay() } else { self.hasError = false self.errorMessage = nil self.labelTextColor = kDefaultActiveColor self.activeBorder.backgroundColor = kDefaultActiveColor self.setNeedsDisplay() } } func validate(){ if self.validationType != nil { var message : Ssortingng = "" if self.validationType! == .Email { var isValid = self.emailValidationBlock(text: self.text, message: &message) performValidation(isValid,message: message) } else { var isValid = self.numberValidationBlock(text: self.text, message: &message) performValidation(isValid,message: message) } } } } extension EGFloatingTextField { } 

Il s'appelle EGFloatingTextField et vous pouvez find plus de détails ici

Utilisation :

 let emailLabel = EGFloatingTextField(frame: CGRectMake(8, 64, CGRectGetWidth(self.view.bounds) - 16, 48)) emailLabel.floatingLabel = true emailLabel.setPlaceHolder("Email") emailLabel.validationType = .Email emailLabel.keyboardType = .EmailAddress self.view.addSubview(emailLabel) 

PS Vous devez importer la bibliothèque PureLayout , ici vous pouvez find la source complète et des instructions sur la façon de l'importer.

Vous pouvez l'essayer de cette façon:

Pour créer l'animation:

1. Placez l'label sur textfield et ajoutez tap gestureRecogniser à l'label. Ajustez l'label à sa position et faites également le champ de text en tant que premier répondeur lorsque vous appuyez sur l'label.

Pour créer la bordure inférieure:

1. Ajoutez un UIView / UIImageView sous le champ de text avec une hauteur de 1 ou 2 pixels en fonction de vos besoins. Et définissez le style sans bordure pour le champ de text.

Pour changer les icons avec des colors, essayez les icons font-awesome . De cette façon, vous avez juste besoin de passer le nom de la string pour changer l'icône en icône de couleur.