Facebook開源動畫庫 POP-小執行個體，facebookpop-

Facebook開源動畫庫 POP-小執行個體，facebookpop-

執行個體1：圖片視圖跟著手在螢幕上的點改變大小

- (void)viewDidLoad{    [super viewDidLoad];    //添加手勢    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(0, 0, point.x, point.y)];    //彈性值    springAnimation.springBounciness = 20.0;    //彈性速度    springAnimation.springSpeed = 20.0;    [_springView pop_addAnimation:springAnimation forKey:@"changeframe"];}

執行個體2：實現一個彈出收縮視圖的效果，彈出來有彈性的效果，收縮有變小的效果

- (void)viewDidLoad{    [super viewDidLoad];        _showPosition = CGRectMake(320-147, 5, 147, 160);    _hidePosition = CGRectMake(320, 5, 0, 0);        _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)];        //讓螢幕從導覽列下開始算(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;}

執行個體3：建立兩個按鍵，增加兩個動畫效果，其中一個按鍵是動畫改變大小，另外一個修改ViewFrame，只要定位好座標跟大小可以做出很不錯的動畫

@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(245, 70, 0, 0)];    [self.view addSubview:_popOut];        _button = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"TimerButton"]];    [_button setFrame:CGRectMake(240, 50, 46, 46)];    [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(37, 37)];    }    else {        buttonAnimation.toValue = [NSValue valueWithCGSize:CGSizeMake(46, 46)];    }    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(245, 70, 0, 10)];    }    else {        popOutAnimation.toValue = [NSValue valueWithCGRect:CGRectMake(180, 60, 75, 26)];    }    popOutAnimation.velocity = [NSValue valueWithCGRect:CGRectMake(200, 0, 300, -200)];    popOutAnimation.springBounciness = 10.0;    popOutAnimation.springSpeed = 10.0;    [_popOut pop_addAnimation:popOutAnimation forKey:@"slide"];}