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"];
}