前段时间看了些动画方面的文章，发现一个很不错的教程：iOS-Core-Animation-Advanced-Techniques，看会这个动画方面基本上差不多了，剩下的就是举一反三了。
疏于原先没有太过关注Facebook的POP动画引擎,做的效果这么好，于是就研究了下，找到了些几篇很好的文章：
POP使用指南：
http://geeklu.com/2014/05/facebook-pop-usage/
很好的POP示例教程:
https://github.com/schneiderandre/popping
https://github.com/kejinlu/facebook-pop-sample
上面都是Objective-C写的，况且Swift出来已经一年了，由于公司项目一直使用OC，Swift也得加强学习，故以后做Demo就用Swift了。
OK，那就仿Popping,用Swift写一个POP动画：SwiftPopping。效果如下：
POP1.gif
0.桥接
POP动画引擎是用Objective-C写的，想要用在Swift项目中，需要用到桥接。
开始桥接项目：前提是创建了SwiftPopping项目并且添加了POP。
第一步：创建桥接文件：SwiftPopping-Bridging-Header.h
第二步：在SwiftPopping-Bridging-Header.h文件中写入：#import
第三步：详见下图：
POP2.jpg
需要注意的地方就是1中 SwiftPopping-Bridging-Header.h 所在项目的位置。
OK,编译运行，成功！
如果想在Objective-C项目中调用Swift代码，可以参考下面的文章：
http://www.shimingwei.com/iOS/OC_Use_Swift.html
1.创建按钮FlatButton
由于我们需要自定义UIButton的一些效果（点进去缩放、出来还原效果），故创建一个FlatButton，代码如下：
import UIKit
class FlatButton: UIButton {
//标题居上下左右间距
override var titleEdgeInsets: UIEdgeInsets{
get{
return UIEdgeInsetsMake(4.0,28.0,4.0,28.0)
}
set{
self.titleEdgeInsets = newValue
}
}
class func button() -> FlatButton{
var button = buttonWithType(UIButtonType.Custom) as! FlatButton
return button
}
override init(frame: CGRect) {
super.init(frame: frame)
setup()//设置按钮
}
required init(coder aDecoder: NSCoder) {
super.init(coder: aDecoder)
}
//内容大小
override func intrinsicContentSize() -> CGSize {
var size = super.intrinsicContentSize()
return CGSizeMake(size.width + self.titleEdgeInsets.left + self.titleEdgeInsets.right,
size.height + self.titleEdgeInsets.top + self.titleEdgeInsets.bottom)
}
/**
设置
*/
func setup(){
self.backgroundColor = self.tintColor;
self.layer.cornerRadius = 4.0
self.setTitleColor(UIColor.whiteColor(), forState: UIControlState.Normal)
self.titleLabel?.font = UIFont(name: "Avenir-Medium", size: 22)
//添加事件
self.addTarget(self, action: "scaleToSmall", forControlEvents: UIControlEvents.TouchDown | UIControlEvents.TouchDragEnter)
self.addTarget(self, action: "scaleAnimation", forControlEvents: UIControlEvents.TouchUpInside)
self.addTarget(self, action: "scaleToDefault", forControlEvents: UIControlEvents.TouchDragExit)
}
//缩小
func scaleToSmall(){
var scaleAnimation = POPBasicAnimation(propertyNamed: kPOPLayerScaleXY)
scaleAnimation.toValue = NSValue(CGPoint:CGPointMake(0.95, 0.95))
self.layer.pop_addAnimation(scaleAnimation, forKey: "scaleToSmallAnimation")
}
//还原
func scaleToDefault(){
var scaleAnimation = POPBasicAnimation(propertyNamed: kPOPLayerScaleXY)
scaleAnimation.toValue = NSValue(CGPoint:CGPointMake(1, 1))
self.layer.pop_addAnimation(scaleAnimation, forKey: "scaleToDefaultAnimation")
}
//动画
func scaleAnimation(){
var scaleAnimation = POPSpringAnimation(propertyNamed: kPOPLayerScaleXY)
scaleAnimation.toValue = NSValue(CGPoint: CGPointMake(1.0, 1.0))
scaleAnimation.velocity = NSValue(CGPoint:CGPointMake(3.0, 3.0))
scaleAnimation.springBounciness = 18.0
self.layer.pop_addAnimation(scaleAnimation, forKey: "scaleAnimation")
}
}
2.创建ButtonViewController
用于实现我们Gif图的效果。
import UIKit
class ButtonViewController: UIViewController {
var flatButton = FlatButton.button()//按钮
var errorLabel = UILabel()//错误标签
var activityIndicatorView = UIActivityIndicatorView(activityIndicatorStyle: UIActivityIndicatorViewStyle.Gray)//导航栏右侧Item
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view.
addButton()//添加按钮
addLabel()//添加标签
addActivityIndicatorView()//添加活动指示视图
}
override func viewWillDisappear(animated: Bool) {
super.viewWillDisappear(animated)
errorLabel.layer.transform = CATransform3DMakeScale(0.5, 0.5, 1)
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
/*
// MARK: - Navigation
// In a storyboard-based application, you will often want to do a little preparation before navigation
override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
// Get the new view controller using segue.destinationViewController.
// Pass the selected object to the new view controller.
}
*/
/**
添加按钮
*/
func addButton(){
flatButton.backgroundColor = UIColor(red: 52/255.0, green: 152/255.0, blue: 219/255.0, alpha: 1.0)
flatButton.setTitle("Log in", forState: UIControlState.Normal)
flatButton.setTranslatesAutoresizingMaskIntoConstraints(false)
flatButton.addTarget(self, action: "touchUpInside:", forControlEvents: UIControlEvents.TouchUpInside)
view.addSubview(flatButton)
//添加约束
self.view.addConstraint(NSLayoutConstraint(item: flatButton, attribute: NSLayoutAttribute.CenterX, relatedBy: NSLayoutRelation.Equal, toItem: view, attribute: NSLayoutAttribute.CenterX, multiplier: 1, constant: 0.0))
self.view.addConstraint(NSLayoutConstraint(item: flatButton, attribute: NSLayoutAttribute.CenterY, relatedBy: NSLayoutRelation.Equal, toItem: view, attribute: NSLayoutAttribute.CenterY, multiplier: 1, constant: 0.0))
}
/**
添加标签
*/
func addLabel(){
errorLabel.font = UIFont(name: "Avenir-Light", size: 18)
errorLabel.textColor = UIColor(red: 231/255.0, green: 76/255.0, blue: 60/255.0, alpha: 1.0)
errorLabel.setTranslatesAutoresizingMaskIntoConstraints(false)
errorLabel.text = "Just a serious login error."
errorLabel.textAlignment = NSTextAlignment.Center
view.insertSubview(errorLabel, belowSubview: flatButton)
//添加约束
self.view.addConstraint(NSLayoutConstraint(item: errorLabel, attribute: NSLayoutAttribute.CenterX, relatedBy: NSLayoutRelation.Equal, toItem: flatButton, attribute: NSLayoutAttribute.CenterX, multiplier: 1, constant: 0.0))
self.view.addConstraint(NSLayoutConstraint(item: errorLabel, attribute: NSLayoutAttribute.CenterY, relatedBy: NSLayoutRelation.Equal, toItem: flatButton, attribute: NSLayoutAttribute.CenterY, multiplier: 1, constant: 0.0))
errorLabel.layer.transform = CATransform3DMakeScale(0.5, 0.5, 1)
}
/**
添加活动指示图
*/
func addActivityIndicatorView(){
activityIndicatorView.hidesWhenStopped = true
self.navigationItem.rightBarButtonItem = UIBarButtonItem(customView: activityIndicatorView)
}
/**
按钮点击时
:param: button 按钮
*/
func touchUpInside(button: FlatButton){
button.userInteractionEnabled = false
activityIndicatorView.startAnimating()
hiddenErrorLabel()
let delayTime = dispatch_time(DISPATCH_TIME_NOW,
Int64(1 * Double(NSEC_PER_SEC)))
dispatch_after(delayTime, dispatch_get_main_queue()) {
self.shakeFlatButton()
self.showErrorLabel()
self.activityIndicatorView.stopAnimating()
}
}
/**
摇晃按钮
*/
func shakeFlatButton(){
var shakeSpringAnimation = POPSpringAnimation(propertyNamed: kPOPLayerPositionX)
shakeSpringAnimation.velocity = NSNumber(float: 2000.0)
shakeSpringAnimation.springBounciness = 20.0
shakeSpringAnimation.completionBlock = {(animation, finished) in
self.flatButton.userInteractionEnabled = true
}
flatButton.layer.pop_addAnimation(shakeSpringAnimation, forKey: "shakeSpringAnimation")
}
/**
显示错误提示标签
*/
func showErrorLabel(){
//缩放
var scaleSpringAnimation = POPSpringAnimation(propertyNamed: kPOPLayerScaleXY)
scaleSpringAnimation.toValue = NSValue(CGPoint: CGPointMake(1, 1))
scaleSpringAnimation.velocity = NSValue(CGPoint: CGPointMake(3, 3))
scaleSpringAnimation.springBounciness = 20.0
errorLabel.layer.pop_addAnimation(scaleSpringAnimation, forKey: "scaleSpringAnimation")
//position Y
var positionSpringAnimation = POPSpringAnimation(propertyNamed: kPOPLayerPositionY)
positionSpringAnimation.toValue = NSNumber(float: Float(flatButton.layer.position.y + flatButton.intrinsicContentSize().height))
positionSpringAnimation.springBounciness = 20.0
errorLabel.layer.pop_addAnimation(positionSpringAnimation, forKey: "positionSpringAnimation")
}
/**
隐藏错误提示标签
*/
func hiddenErrorLabel(){
//缩放
var scaleSpringAnimation = POPSpringAnimation(propertyNamed: kPOPLayerScaleXY)
scaleSpringAnimation.toValue = NSValue(CGPoint: CGPointMake(0.5, 0.5))
scaleSpringAnimation.velocity = NSValue(CGPoint: CGPointMake(3, 3))
scaleSpringAnimation.springBounciness = 20.0
errorLabel.layer.pop_addAnimation(scaleSpringAnimation, forKey: "scaleSpringAnimation")
//position Y
var positionSpringAnimation = POPSpringAnimation(propertyNamed: kPOPLayerPositionY)
positionSpringAnimation.toValue = NSNumber(float: Float(flatButton.layer.position.y))
positionSpringAnimation.springBounciness = 20.0
errorLabel.layer.pop_addAnimation(positionSpringAnimation, forKey: "positionSpringAnimation")
}
}