自定义 UISegmentedControl

问题描述

如何制作自定义 UISegmentedControl?

我有 2 张图片，其中 1 张应在段处于活动状态时显示，而另一张应在段处于非活动状态时显示.我可以覆盖样式或其他东西，所以我有一个 UISegmentedControl 与我自己的图像作为活动/非活动背景?

I have 2 images, 1 that should be displayed when the segment is active and the other if the segment is inactive. Can i override the style or something so i have a UISegmentedControl with my own images as active/inactive background?

推荐答案

除了on"和off"位置有两种不同的状态之外，我还必须添加这个额外的代码:

I had to add this extra code, in addition to having 2 different states for the "on" and "off" positions:

- (void)viewDidLoad
{
    [super viewDidLoad];

    // Set set segControl background to transparent
    CGRect rect = CGRectMake(0, 0, 1, 1);
    UIGraphicsBeginImageContext(rect.size);
    CGContextRef context = UIGraphicsGetCurrentContext();
    CGContextSetFillColorWithColor(context, [[UIColor clearColor] CGColor]);
    CGContextFillRect(context, rect);
    UIImage *transparentImage = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();

    [self.segControl setBackgroundImage:transparentImage forState:UIControlStateNormal barMetrics:UIBarMetricsDefault];

    [self.segControl setDividerImage:transparentImage forLeftSegmentState:UIControlStateNormal rightSegmentState:UIControlStateNormal barMetrics:UIBarMetricsDefault];
}

因为这得到了一些宣传，所以更简洁的解决方案是使用 [UIImage new] 而不是创建透明图像，例如:

Because this is getting some publicity, a cleaner solution is to use [UIImage new] instead of creating transparent images, as such:

 [self.segControl setDividerImage:[UIImage new] forLeftSegmentState:UIControlStateNormal rightSegmentState:UIControlStateNormal barMetrics:UIBarMetricsDefault];
 [self.segControl setBackgroundImage:[UIImage new] forState:UIControlStateNormal barMetrics:UIBarMetricsDefault];

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