iphone - 如何垂直移动带有 slider 的 UILabel

Question

我想将我的 slider 与我的拇指图像一起垂直移动。但是移动是错误的。

它在水平方向上完美运行，但在垂直方向上运行不佳

- (void)viewDidLoad
{
 CGAffineTransform trans = CGAffineTransformMakeRotation(-M_PI * 0.5);
 self.SDSlider.transform = trans;
}

- (IBAction)sliderValueChanged:(UISlider *)sender
{
    self.SDlabel.text = [NSString stringWithFormat:@"%d", (int)sender.value];

    CGRect trackRect = [self.SDSlider trackRectForBounds:self.SDSlider.bounds];
    CGRect thumbRect = [self.SDSlider thumbRectForBounds:self.SDSlider.bounds
                                             trackRect:trackRect
                                                 value:self.SDSlider.value];

    self.testSDlabel.center = CGPointMake(thumbRect.origin.x + self.SDSlider.frame.origin.x,  self.SDSlider.frame.origin.y - 20);
    self.testSDlabel.text = [NSString stringWithFormat:@"%.0f", self.SDSlider.value];  
}

标签从左向右移动，而不是从下往上移动

Answer 1

Got 正在通过更改 center.y 值来工作

- (IBAction)sliderValueChanged:(UISlider *)sender
{
    self.SDlabel.text = [NSString stringWithFormat:@"%d", (int)sender.value];


    CGRect trackRect = [self.SDSlider trackRectForBounds:self.SDSlider.bounds];
    CGRect thumbRect = [self.SDSlider thumbRectForBounds:self.SDSlider.bounds
                                             trackRect:trackRect
                                                 value:self.SDSlider.value];

    self.SDlabel.text = [NSString stringWithFormat:@"%.0f", self.SDSlider.value];

    NSLog(@"thumbRect.origin.x %f",thumbRect.origin.x);
    NSLog(@"self.testSDlabel %f",self.SDlabel.center.x);    
    self.SDlabel.center = CGPointMake(self.SDlabel.center.x, 423 - thumbRect.origin.x);

}