走进 Facebook POP 的世界

POP: 一个流行的可扩展的动画引擎iOS,它支持spring和衰变动态动画,使其可用于构建现实,基于物理交互。Objective - C API允许快速集成, 对于所有的动画和过渡他是成熟的.

解释:

1.1 POP 使用 Objective-C++ 编写，Objective-C++ 是对 C++ 的扩展，就像 Objective-C 是 C 的扩展。而至于为什么他们用 Objective-C++ 而不是纯粹的 Objective-C. 可能是偏爱。-.O

1.2 POP 目前由四部分组成：1. Animations；2. Engine；3. Utility；4. WebCore。下图有助于你更好的理解它的架构

1.它支持CocoaPods 你可以这样

pod 'pop', '~> 1.0.8'

2.或者这样点击下载拉入工程 https://github.com/facebook/pop

3.我使用的Cocoapods 所以使用之前你需要这样

#import <POP.h>

动图

E1:

- (void)clickPopAction

{

    // kPOPLayerPositionY 向下

    // kPOPLayerPositionX 向右

    POPSpringAnimation *anim = [POPSpringAnimation animationWithPropertyNamed:kPOPLayerPositionY];

    // 移动距离

    anim.toValue = [[NSNumber alloc] initWithFloat:_btnPop.center.y + 200];

    // 从当前 + 1s后开始

    anim.beginTime = CACurrentMediaTime() + 1.0f;

    // 弹力--晃动的幅度 (springSpeed速度)

    anim.springBounciness = 15.0f;

    [_btnPop pop_addAnimation:anim forKey:@"position"];

    POPSpringAnimation *anim1 = [POPSpringAnimation animationWithPropertyNamed:kPOPLayerBounds];

    anim1.toValue = [NSValue valueWithCGRect:CGRectMake(100, 100, 99, 99)];

    [_btnPop pop_addAnimation:anim1 forKey:@"size"];

}

动图

E2:在很多金融类app中比较常见、支付宝中的余额包、京东金融余额、就类似这样

// 初始化

    POPBasicAnimation *anim = [POPBasicAnimation animation];

    // 限时 1s

    anim.duration = 3.0;

    POPAnimatableProperty * prop = [POPAnimatableProperty propertyWithName:@"count++" initializer:^(POPMutableAnimatableProperty *prop) {

        prop.readBlock = ^(id obj, CGFloat values[]){ values[0] = [[obj description] floatValue]; };

        prop.writeBlock = ^(id obj, const CGFloat values[])

        {

            [obj setText:[NSString stringWithFormat:@"%.2f",values[0]]];

        };

        prop.threshold = 0.01;

    }];

    anim.property = prop;

    anim.fromValue = @(0.0);

    anim.toValue = @(1314.52);

    [self.xt_countLabel pop_addAnimation:anim forKey:@"counting"];

动图

E3

CALayer *layer0 = [CALayer layer];

    layer0.opacity = 1.0;

    layer0.transform = CATransform3DIdentity;

    [layer0 setMasksToBounds:YES];

    [layer0 setBackgroundColor:[UIColor colorWithRed:0.5448 green:0.6836 blue:0.9986 alpha:1.0].CGColor];

    [layer0 setCornerRadius:12.5];

    [layer0 setBounds:CGRectMake(0, 0, 25, 25)];

    [self.view.layer addSublayer:layer0];

    layer0.position = CGPointMake(self.view.center.x, 266);

    [self performAnimation:layer0];

- (void)performAnimation:(CALayer *)layer

{

    [layer pop_removeAllAnimations];

    POPBasicAnimation *anim = [POPBasicAnimation animationWithPropertyNamed:kPOPLayerScaleXY];

    static BOOL ani = YES;

    if (ani) {

        anim.toValue = [NSValue valueWithCGPoint:CGPointMake(1.0, 1.0)];

    }else{

        anim.toValue = [NSValue valueWithCGPoint:CGPointMake(1.5, 1.5)];

    }

    ani = !ani;

    anim.completionBlock = ^(POPAnimation *anim, BOOL finished) {

        if (finished) { [self performAnimation:layer]; }

    };

    [layer pop_addAnimation:anim forKey:@"Animation"];

}