iOS13之后的分段控制器背景灰色

Question

我目前在使用iOS 13分段控制器时遇到问题。我有这种方法可以更改分段控制器的外观，在iOS 13退出之前，它一直很好用。现在，即使我将背景色设置为白色，黑色或其他任何颜色，segmentedController始终具有灰色背景。

我该怎么办？

- (void)modifySegmentedControl{
    if (@available(iOS 13.0, *)) {
        [_segmentedControl setBackgroundColor:UIColor.clearColor];
        [_segmentedControl setSelectedSegmentTintColor:UIColor.clearColor];
    } else {
         //I had this for <iOS13, it works great
        [_segmentedControl setBackgroundColor:UIColor.clearColor];
        [_segmentedControl setTintColor:UIColor.clearColor];
    }

    [_segmentedControl setTitleTextAttributes:
       [NSDictionary dictionaryWithObjectsAndKeys:
        [UIColor colorWithRed:0.25 green:0.25 blue:0.25 alpha:0.6], NSForegroundColorAttributeName,
        [UIFont fontWithName:@"Poppins-Medium" size:15.0], NSFontAttributeName,
       nil]
    forState: UIControlStateNormal];

    [_segmentedControl setTitleTextAttributes:
       [NSDictionary dictionaryWithObjectsAndKeys:
        [UIColor colorWithRed:0.25 green:0.25 blue:0.25 alpha:1.0], NSForegroundColorAttributeName,
        [UIFont fontWithName:@"Poppins-Medium" size:15.0], NSFontAttributeName,
       nil]
    forState: UIControlStateSelected];

    self->greenBar = [[UIView alloc] init];
//This needs to be false since we are using auto layout constraints
    [self->greenBar setTranslatesAutoresizingMaskIntoConstraints:NO];
    [self->greenBar setBackgroundColor:[UIColor colorWithRed:0.00 green:0.58 blue:0.27 alpha:1.0]]; //Kelley green
//
    [_vistaTable addSubview:self->greenBar];
//
    [self->greenBar.topAnchor constraintEqualToAnchor:_segmentedControl.bottomAnchor].active = YES;
    [self->greenBar.heightAnchor constraintEqualToConstant:3].active = YES;
    [self->greenBar.leftAnchor constraintEqualToAnchor:_segmentedControl.leftAnchor].active = YES;
    [self->greenBar.widthAnchor constraintEqualToAnchor:_segmentedControl.widthAnchor multiplier:0.5].active = YES;
}

Answer 1

尝试一下：

if (@available(iOS 13.0, *)) {
    self.segmentedControl.selectedSegmentTintColor = UIColor.redColor;
    self.segmentedControl.layer.backgroundColor = UIColor.greenColor.CGColor;
}

[.selectedSegmentTintColor定义所选按钮的颜色，.layer.backgroundColor定义整个UISegmentedControl背景的颜色。

这是结果：

编辑

[事实证明，这对于背景清晰或白色不起作用，因为在iOS 13上，在分段控件的背景和分隔线上添加了一种背景图像：

一种工作方式是使用UIGraphicsGetImageFromCurrentImageContext从彩色创建图像。代码如下：

- (void)viewDidLoad {
    [super viewDidLoad];

    if (@available(iOS 13.0, *)) {
        self.segmentedControl.selectedSegmentTintColor = UIColor.redColor;
        self.segmentedControl.layer.backgroundColor = UIColor.clearColor.CGColor;
        [self customizeSegmentedControlWithColor: UIColor.whiteColor];
    }
}

- (void)customizeSegmentedControlWithColor:(UIColor *)color {

    UIImage *tintColorImage = [self imageWithColor: color];
    [self.segmentedControl setBackgroundImage:[self imageWithColor:self.segmentedControl.backgroundColor ? self.segmentedControl.backgroundColor : [UIColor clearColor]] forState:UIControlStateNormal barMetrics:UIBarMetricsDefault];
    [self.segmentedControl setBackgroundImage:tintColorImage forState:UIControlStateSelected barMetrics:UIBarMetricsDefault];
    [self.segmentedControl setBackgroundImage:[self imageWithColor:[color colorWithAlphaComponent:0.2]] forState:UIControlStateHighlighted barMetrics:UIBarMetricsDefault];
    [self.segmentedControl setBackgroundImage:tintColorImage forState:UIControlStateSelected|UIControlStateSelected barMetrics:UIBarMetricsDefault];
    [self.segmentedControl setDividerImage:tintColorImage forLeftSegmentState:UIControlStateNormal rightSegmentState:UIControlStateNormal barMetrics:UIBarMetricsDefault];
    self.segmentedControl.layer.borderWidth = 1;
    self.segmentedControl.layer.borderColor = [color CGColor];
}

- (UIImage *)imageWithColor: (UIColor *)color {
    CGRect rect = CGRectMake(0.0f, 0.0f, 1.0f, 1.0f);
    UIGraphicsBeginImageContext(rect.size);
    CGContextRef context = UIGraphicsGetCurrentContext();
    CGContextSetFillColorWithColor(context, [color CGColor]);
    CGContextFillRect(context, rect);
    UIImage *theImage = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();
    return theImage;
}

查看更多信息here。