本文资料来自http://www.appcoda.com/facebook-pop-framework-intro/ 如有错误欢迎各位指出
如果你使用 CocoaPods，你可以添加下面这句话到你的工程中的Podfile文件中；
pod ‘pop’
如果你没有CocoaPods，你能下载Pop这个框架在https://github.com/facebook/pop 之后添加pop这个文件夹到你的工程中，并且确保你的工程中的“Other Linker Flags”选项已经添加了“-lc++”;
使用Pop
首先导入头文件
#import "POP.h"
例子一：UITableViewCell Animation
我们创建一个动画在tableViewCell上，首先添加一个放大的动画当我们点击cell的时候，当我们手离开屏幕的时候，我们用将cell上缩回原先的大小用spring animation；
重写cell中的setHighlighted方法，代码如下：
- (void)setHighlighted:(BOOL)highlighted animated:(BOOL)animated
{
[super setHighlighted:highlighted animated:animated];
if (self.highlighted) {
POPBasicAnimation *scaleAnimation = [POPBasicAnimation animationWithPropertyNamed:kPOPViewScaleXY];
scaleAnimation.duration = 0.1;
scaleAnimation.toValue = [NSValue valueWithCGPoint:CGPointMake(1, 1)];
[self.textLabel pop_addAnimation:scaleAnimation forKey:@"scalingUp"];
} else {
POPSpringAnimation *sprintAnimation = [POPSpringAnimation animationWithPropertyNamed:kPOPViewScaleXY];
sprintAnimation.toValue = [NSValue valueWithCGPoint:CGPointMake(0.9, 0.9)];
sprintAnimation.velocity = [NSValue valueWithCGPoint:CGPointMake(2, 2)];
sprintAnimation.springBounciness = 20.f;
[self.textLabel pop_addAnimation:sprintAnimation forKey:@"springAnimation"];
}
}
Pop为我们提供许多创建动画的预定义属性，你能找到这些属性在“POPAnimatableProperty.h”文件中；
例子二：Animating a Like Button
创建一个controller在storyBoard中，在controller中创建一个UITextField，之后添加一个send和like按钮，like按钮在send按钮的上面，默认的情况下我们展示like按钮，当用户输入文字在textField中我们隐藏like按钮，展示send按钮用一个动画；
创建一个名为FacebookButtonAnimationViewController的类 继承UIViewController；在这个类中添加like和send按钮，还有textField的变量；
@interface FacebookButtonAnimationViewController ()
@property (weak, nonatomic) IBOutlet UITextField *msgTextField;
@property (weak, nonatomic) IBOutlet UIButton *likeButton;
@property (weak, nonatomic) IBOutlet UIButton *sendButton;
@end
实现UITextField的代理方法：
-(BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string
在这个方法中我们可以监控用户输入和删除文字，内部的实现如下：
-(BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string
{
NSString *comment;
if(range.length == 0)
{
comment = [NSString stringWithFormat:@"%@%@", textField.text, string];
}
else
{
comment = [textField.text substringToIndex:textField.text.length - range.length];
}
if (comment.length == 0) {
//Show like
[self showLikeButton];
}
else
{
//Show Send
[self showSendButton];
}
return YES;
}
之后我们实现showLikeButton和showSendButton
-(void)showLikeButton
{
self.likeButton.hidden = NO;
self.sendButton.hidden = YES;
POPSpringAnimation *spin = [POPSpringAnimation animationWithPropertyNamed:kPOPLayerRotation];
spin.fromValue = @(M_PI / 4);
spin.toValue = @(0);
spin.springBounciness = 20;
spin.velocity = @(10);
[self.likeButton.layer pop_addAnimation:spin forKey:@"likeAnimation"];
}
-(void)showSendButton
{
if (self.sendButton.isHidden) {
self.likeButton.hidden = YES;
self.sendButton.hidden = NO;
POPSpringAnimation *sprintAnimation = [POPSpringAnimation animationWithPropertyNamed:kPOPViewScaleXY];
sprintAnimation.velocity = [NSValue valueWithCGPoint:CGPointMake(8, 8)];
sprintAnimation.springBounciness = 20.f;
[self.sendButton pop_addAnimation:sprintAnimation forKey:@"sendAnimation"];
}
}
例子三：Wrong Password Animation
首先在storyBoard中新建一个controller，在controller中添加textField和一个button；
接下来创建一个继承UIViewControll名位WrongPasswordViewController的类，在类中创建一个UITextField的变量与storyBoard中的textField关联，命名为passwordTextField；
@interface WrongPasswordViewController ()
@property (weak, nonatomic) IBOutlet UITextField *passwordTextField;
@end
之后我们创建一个名位login的方法为Login Button,在这个方法中我们校验密码是否正确，如果不正确我们为textField添加一个摇晃动画；
-(void)login{
POPSpringAnimation *shake = [POPSpringAnimation animationWithPropertyNamed:kPOPLayerPositionX];
shake.springBounciness = 20;
shake.velocity = @(3000);
[self.passwordTextField.layer pop_addAnimation:shake forKey:@"shakePassword"];
}
例子四：Custom View Controller Transition
这个例子将教你们怎么跳转到一个控制器用自定义动画，我们在控制器中建一个按钮“present”，当用户点击这个按钮，app跳转到另一个控制器中用一个自定义动画，从iOS7开始，你能够自定义控制器的过渡动画用UIViewController的transitioningDelegate.在这个代理中，我们要实现UIViewControllerTransitioningDelegate的代理方法，还有提供过渡动画的实现；
首先，创建在storyBoard中创建俩个controller和俩个新类，命名为 “CustomVCTransitionViewController”和 “CustomModalViewController”
UI设计如下：
现在我们实现CustomVCTransitionViewController中Present按钮的点击，首先是添加UIViewControllerTransitioningDelegate的声明；
在CustomVCTransitionViewController.m 我们引入一下头文件：
#import "CustomModalViewController.h"
#import "PresentingAnimationController.h"
#import "DismissingAnimationController.h"
接下来实现Present按钮的action和代理方法：
- (IBAction)didClickOnPresent:(id)sender {
CustomModalViewController *modalVC = [self.storyboard instantiateViewControllerWithIdentifier:@"customModal"];
modalVC.transitioningDelegate = self;
modalVC.modalPresentationStyle = UIModalPresentationCustom;
[self.navigationController presentViewController:modalVC animated:YES completion:nil];
}
#pragma mark - UIViewControllerTransitionDelegate -
- (id <UIViewControllerAnimatedTransitioning>)animationControllerForPresentedController:(UIViewController *)presented presentingController:(UIViewController *)presenting sourceController:(UIViewController *)source
{
return [[PresentingAnimationController alloc] init];
}
- (id <UIViewControllerAnimatedTransitioning>)animationControllerForDismissedController:(UIViewController *)dismissed
{
return [[DismissingAnimationController alloc] init];
}
当Present按钮被点击的时候，didClickOnPresent会响应点击事件，在这个方法中我们初始化CustomModalViewController，并且设置过度代理方法对于当前这个controller；
我们必须实现 UIViewControllerTransitioningDelegate中俩个必须实现的代理方法，animationControllerForPresentedController方法返回跳转到CustomModalViewController的过渡动画.相反，animationControllerForDismissedController返回动画为了要dismiss的控制器；
现在我们创建一个继承NSObject的新类叫做PresentingAnimationController，在这个类中我们遵守UIViewControllerAnimatedTransitioning协议.
在PresentingAnimationController.m中我们添加下面的方法：
- (NSTimeInterval)transitionDuration:(id <UIViewControllerContextTransitioning>)transitionContext
{
return 0.5f;
}
- (void)animateTransition:(id <UIViewControllerContextTransitioning>)transitionContext
{
UIView *fromView = [transitionContext viewControllerForKey:UITransitionContextFromViewControllerKey].view;
fromView.tintAdjustmentMode = UIViewTintAdjustmentModeDimmed;
fromView.userInteractionEnabled = NO;
UIView *toView = [transitionContext viewControllerForKey:UITransitionContextToViewControllerKey].view;
toView.frame = CGRectMake(0,
0,
CGRectGetWidth(transitionContext.containerView.bounds) - 100.f,
CGRectGetHeight(transitionContext.containerView.bounds) - 280.f);
CGPoint p = CGPointMake(transitionContext.containerView.center.x, -transitionContext.containerView.center.y);
toView.center = p;
[transitionContext.containerView addSubview:toView];
POPSpringAnimation *positionAnimation = [POPSpringAnimation animationWithPropertyNamed:kPOPLayerPositionY];
positionAnimation.toValue = @(transitionContext.containerView.center.y);
positionAnimation.springBounciness = 10;
[positionAnimation setCompletionBlock:^(POPAnimation *anim, BOOL finished) {
[transitionContext completeTransition:YES];
}];
POPSpringAnimation *scaleAnimation = [POPSpringAnimation animationWithPropertyNamed:kPOPLayerScaleXY];
scaleAnimation.springBounciness = 20;
scaleAnimation.fromValue = [NSValue valueWithCGPoint:CGPointMake(1.2, 1.4)];
[toView.layer pop_addAnimation:positionAnimation forKey:@"positionAnimation"];
[toView.layer pop_addAnimation:scaleAnimation forKey:@"scaleAnimation"];
}
第一个方法返回过渡时间，为了实现动画，我们实现animateTransition方法，这里我们将实现怎么去跳转。
现在我们创建一个继承NSObject的新类叫做DismissingAnimationController，在这个类中我们遵守UIViewControllerAnimatedTransitioning协议.
相似，我们在DismissingAnimationController.m添加如下方法：
- (NSTimeInterval)transitionDuration:(id <UIViewControllerContextTransitioning>)transitionContext
{
return 0.5f;
}
- (void)animateTransition:(id <UIViewControllerContextTransitioning>)transitionContext
{
UIView *toView = [transitionContext viewControllerForKey:UITransitionContextToViewControllerKey].view;
toView.tintAdjustmentMode = UIViewTintAdjustmentModeNormal;
toView.userInteractionEnabled = YES;
UIView *fromView = [transitionContext viewControllerForKey:UITransitionContextFromViewControllerKey].view;
POPBasicAnimation *closeAnimation = [POPBasicAnimation animationWithPropertyNamed:kPOPLayerPositionY];
closeAnimation.toValue = @(-fromView.layer.position.y);
[closeAnimation setCompletionBlock:^(POPAnimation *anim, BOOL finished) {
[transitionContext completeTransition:YES];
}];
POPSpringAnimation *scaleDownAnimation = [POPSpringAnimation animationWithPropertyNamed:kPOPLayerScaleXY];
scaleDownAnimation.springBounciness = 20;
scaleDownAnimation.toValue = [NSValue valueWithCGPoint:CGPointMake(0, 0)];
[fromView.layer pop_addAnimation:closeAnimation forKey:@"closeAnimation"];
[fromView.layer pop_addAnimation:scaleDownAnimation forKey:@"scaleDown"];
}
来到CustomModalViewController.m中，更新viewDidLoad方法并且实现didClickOnClose方法：
-(void)viewDidLoad
{
[super viewDidLoad];
self.view.layer.cornerRadius = 8.f;
}
- (IBAction)didClickOnClose:(id)sender {
[self dismissViewControllerAnimated:YES completion:nil];
}
