Facebook开源动画库 POP-小实例

实例1：图片视图跟着手在屏幕上的点改变大小

- (void)viewDidLoad
{
    [super viewDidLoad];
    //添加手势
    UIPanGestureRecognizer *gesture = [[UIPanGestureRecognizer alloc] init];
    [gesture addTarget:self action:@selector(changeSize:)];
    [self.view addGestureRecognizer:gesture];

}

- (void)changeSize:(UIPanGestureRecognizer*)tap{
    POPSpringAnimation *springAnimation = [POPSpringAnimation animationWithPropertyNamed:kPOPViewFrame];

    CGPoint point = [tap locationInView:self.view];
    springAnimation.toValue = [NSValue valueWithCGRect:CGRectMake(, , point.x, point.y)];

    //弹性值
    springAnimation.springBounciness = 20.0;
    //弹性速度
    springAnimation.springSpeed = 20.0;
    [_springView pop_addAnimation:springAnimation forKey:@"changeframe"];

}

实例2：实现一个弹出收缩视图的效果，弹出来有弹性的效果，收缩有变小的效果

- (void)viewDidLoad
{
    [super viewDidLoad];

    _showPosition = CGRectMake(-, , , );
    _hidePosition = CGRectMake(, , , );

    _popView = [[UIImageView alloc] initWithFrame:_hidePosition];
    _popView.image = [UIImage imageNamed:@"menu.png"];
    [self.view addSubview:_popView];

    self.navigationItem.rightBarButtonItem = [[UIBarButtonItem alloc] initWithTitle:@"+" style:UIBarButtonItemStyleDone target:self action:@selector(showPop)];

    //让屏幕从导航栏下开始算(0,0)
    if ([self respondsToSelector:@selector(setEdgesForExtendedLayout:)]) {
        self.edgesForExtendedLayout = UIRectEdgeNone;
    }
}

- (void)showPop{

    if (_isOpened) {
        [self hidePop];
        return;
    }
    _isOpened = YES;

    POPSpringAnimation *positionAnimation = [POPSpringAnimation animationWithPropertyNamed:kPOPViewFrame];
    positionAnimation.fromValue = [NSValue valueWithCGRect:_hidePosition];
    positionAnimation.toValue = [NSValue valueWithCGRect:_showPosition];
    positionAnimation.springBounciness = 15.0f;
    positionAnimation.springSpeed = 20.0f;
    [_popView pop_addAnimation:positionAnimation forKey:@"frameAnimation"];
}

- (void)hidePop{

    POPBasicAnimation *positionAnimation = [POPBasicAnimation animationWithPropertyNamed:kPOPViewFrame];
    positionAnimation.fromValue = [NSValue valueWithCGRect:_showPosition];
    positionAnimation.toValue = [NSValue valueWithCGRect:_hidePosition];
    [_popView pop_addAnimation:positionAnimation forKey:@"frameAnimation"];

    _isOpened = NO;
}

实例3：创建两个按键，增加两个动画效果，其中一个按键是动画改变大小，另外一个修改ViewFrame，只要定位好坐标跟大小可以做出很不错的动画

@interface ViewController ()

@property (nonatomic, retain) UIView *button;
@property (nonatomic, retain) UIView *popOut;
@property (readwrite, assign) BOOL timerRunning;

@end

@implementation ViewController

- (void)viewDidLoad
{
    [super viewDidLoad];

    _popOut = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"TimerPopOut"]];
    [_popOut setFrame:CGRectMake(, , , )];
    [self.view addSubview:_popOut];

    _button = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"TimerButton"]];
    [_button setFrame:CGRectMake(, , , )];
    [self.view addSubview:_button];

    _timerRunning = NO;

    [self.view addGestureRecognizer:[[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(demoAnimate:)]];
}

- (void)demoAnimate:(UITapGestureRecognizer*)tap
{
    _timerRunning = !_timerRunning;

    POPSpringAnimation *buttonAnimation = [POPSpringAnimation animation];
    buttonAnimation.property = [POPAnimatableProperty propertyWithName:kPOPLayerSize];
    if (_timerRunning) {
        buttonAnimation.toValue = [NSValue valueWithCGSize:CGSizeMake(, )];
    }
    else {
        buttonAnimation.toValue = [NSValue valueWithCGSize:CGSizeMake(, )];
    }
    buttonAnimation.springBounciness = 10.0;
    buttonAnimation.springSpeed = 10.0;
    [_button pop_addAnimation:buttonAnimation forKey:@"pop"];

    POPSpringAnimation *popOutAnimation = [POPSpringAnimation animation];
    popOutAnimation.property = [POPAnimatableProperty propertyWithName:kPOPViewFrame];
    if (!_timerRunning) {
        popOutAnimation.toValue = [NSValue valueWithCGRect:CGRectMake(, , , )];
    }
    else {
        popOutAnimation.toValue = [NSValue valueWithCGRect:CGRectMake(, , , )];
    }
    popOutAnimation.velocity = [NSValue valueWithCGRect:CGRectMake(, , , -)];
    popOutAnimation.springBounciness = 10.0;
    popOutAnimation.springSpeed = 10.0;
    [_popOut pop_addAnimation:popOutAnimation forKey:@"slide"];
}