ios - 用于自定义拇指位置和拇指图像的 UISlider 子类？

Question

是否可以通过子类化 UISlider 来实现上述 slider ？我希望 slider 拇指移动到边缘，但还剩下一些空间。我通过覆盖以下方法实现了自定义位置，但现在拇指没有响应触摸事件。

-(void)awakeFromNib {
    [super awakeFromNib];
    [self setThumbImage:[UIImage imageNamed:IMG_SLIDER_THUMB] forState:UIControlStateNormal];
}

- (CGRect)thumbRectForBounds:(CGRect)bounds trackRect:(CGRect)rect value:(float)value {
    UIImage* image = self.currentThumbImage;

    CGRect thumbRect = [super thumbRectForBounds:bounds trackRect:rect value:value];

return CGRectMake(thumbRect.origin.x, rect.origin.y+2, image.size.width, image.size.height);
}

Answer 1

我通过子类化 UISlider 来实现上面的功能，并且对于触摸事件问题，我向 Storyboard 中的 slider 添加了高度约束，以增加运行时的边界。以下是将 slider 移动到边缘和自定义拇指位置的代码:

//Get thumb rect for larger track rect than actual to move slider to edges
-(CGRect)thumbRectForBounds:(CGRect)bounds trackRect:(CGRect)rect value:(float)value {
    UIImage *image = self.currentThumbImage;

    rect.origin.x -= SLIDER_OFFSET;
    rect.size.width += (SLIDER_OFFSET*2);
    CGRect thumbRect = [super thumbRectForBounds:bounds trackRect:rect value:value];
    return CGRectMake(thumbRect.origin.x, rect.origin.y+2, image.size.width, image.size.height);
}

//Make track rect smaller than bounds
-(CGRect)trackRectForBounds:(CGRect)bounds  {
    bounds.origin.x += SLIDER_OFFSET;
    bounds.size.width -= (SLIDER_OFFSET*2);
    CGRect trackRect = [super trackRectForBounds:bounds];

    return CGRectMake(trackRect.origin.x, trackRect.origin.y, trackRect.size.width, trackRect.size.height);
}