ios – Animate UISlider顺利进行动画制作

我想为UiSlider设置动画,例如0.25到0.75然后回来.这应该向用户显示要做什么.

我试过这个：

[self incrementCounter:[NSnumber numberWithInt:0]];


-(void) incrementCounter:(NSnumber *)i {
    [Slider SETVALue:[i floatValue]/1000];
    [self performSELEctor:@SELEctor(incrementCounter:) withObject:[NSnumber numberWithInt:i.intValue+1] afterDelay:0.001];
}

但那不是那么顺利……我可以使用转换吗？

[Slider SETVALue:1 animated:YES];

快要…

[UIView animateWithDuration:2.0
                 animations:^{
                     [Slider SETVALue:0.2];
                 }];
[UIView animateWithDuration:2.0
                 animations:^{
                     [Slider SETVALue:0.5];
                 }];

只是动画第二个……

-(IBACtion)animateSlider:(id)sender {

    [UIView animateWithDuration:2 animations:^{
        [self.slider SETVALue:.75];
    } completion:^(BOOL finished) {
        [UIView animateWithDuration:2 animations:^{
            [self.slider SETVALue:0.25];//or `[self.slider SETVALue:(.75)-(.5*finished)];` if you want to be safe
        }];
    }];
}