项目初期因为需要用到动画展示，便写了自带的
[UIView animateWithDuration:2.0 animations:^{
CGRect frame = self.theGreenView.frame;
frame.origin.x+= 200;
self.theGreenView.frame = frame;
} completion:^(BOOL finished) {
}
}];
随着需求的增加、需要时时的展示控件的X坐标，上面方法不能满足需求了。
然后开始集成pop的POPAnimatableProperty进行自定义动画，目的是改变imageview的x轴坐标
官方地址 https://github.com/facebook/pop
POPAnimatableProperty *prop = [POPAnimatableProperty propertyWithName:@"countdown" initializer:^(POPMutableAnimatableProperty *prop) {
prop.writeBlock = ^(id obj, const CGFloat values[]) {
// NSLog(@"values==%f",(float)values[0]);
[imageview setLeft:(float)values[0]]；
};
// prop.threshold = 0.01f;
}];
POPBasicAnimation *anBasic = [POPBasicAnimation linearAnimation]; //
anBasic.property = prop; //自定义属性
anBasic.fromValue = @(imageview.left); //获取imageview的初始x轴坐标
anBasic.toValue = @(value); //imageview 的x轴坐标
anBasic.duration = 10; //持续时间
anBasic.beginTime = CACurrentMediaTime() ; //开始时间
[imageview pop_addAnimation:anBasic forKey:@"countdown"];
