iOS slider 改变方向变竖

        UISlider *slider = [[UISlider alloc] initWithFrame:CGRectMake(100, 450, 200, 20)];
        slider.minimumValue = 0.0;
        slider.maximumValue = 1;
        slider.value = 0.0;
        [slider addTarget:self action:@selector(updateValue:) forControlEvents:UIControlEventValueChanged];
        slider.transform =CGAffineTransformMakeRotation(M_PI/2); //旋转一下即可 -_-!!