iphone - 隐藏 UISlider 缩略图

Question

我正在尝试创建一个没有缩略图的 UISlider。

我该怎么做，这是我目前的代码:

UISlider *sli = [[UISlider alloc] initWithFrame:progressView.frame];
    [sli setThumbImage:nil forState:UIControlStateNormal];
    [sli setBackgroundColor:[UIColor clearColor]];

    [sli setMinimumTrackImage:[[UIImage imageNamed:@"ProgressBlueCap.png"] stretchableImageWithLeftCapWidth:10.0 topCapHeight:0.0] forState:UIControlStateNormal];
    [sli setMaximumTrackImage:[[UIImage imageNamed:@"ProgressBlueCapRight.png"] stretchableImageWithLeftCapWidth:10.0 topCapHeight:0.0] forState:UIControlStateNormal];

Answer 1

更简单:

对象

[sli setThumbImage:[[[UIImage alloc] init] autorelease] forState:UIControlStateNormal];

快速版本

sli.setThumbImage(UIImage(), for: .normal)