Question

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如何在UISegmentedControl（Bar style）中摆脱或更改白色渐变？

Answer 1

我找到的唯一方法是在每个细分上绘制一个图层。坏消息是，每当它改变时你必须自己着色选定的段（并且“取消选择”未选择的段）好消息是，你可以为每一个细分市场提供多种不同的颜色，并在蓝色附近的绿色附近显示红色...

您可以在segmentedControl更改时调用您的方法：

- (IBAction)changeSection:(id)sender {
    UISegmentedControl *segmetedControl = sender;
    [self colorize2SegmentsWithSelected:segmetedControl.selectedSegmentIndex];
// (...)
}

并在您的方法中：

-(void)colorize2SegmentsWithSelected:(int)selected{
    switch (selected) {
        case 0:
            [self myShineGradient:[initialStateArraySegmentedControl objectAtIndex:1] withColor1:myUIColor1  withColor2:myUIColor2];

            [self myShineGradient:[initialStateArraySegmentedControl objectAtIndex:0] withColor1:myUIColor3  withColor2:myUIColor4];
            break;
        case 1:
            [self myShineGradient:[initialStateArraySegmentedControl objectAtIndex:0] withColor1:myUIColor1  withColor2:myUIColor2];

            [self myShineGradient:[initialStateArraySegmentedControl objectAtIndex:1] withColor1:myUIColor3  withColor2:myUIColor4];
            break;
// (...)
}
// (...)
}

其中myColor1和2是未选定段的中性色（UIColor），选择3 + 4 在你的情况下，如果你只想要一种颜色，那么1种颜色=第二种颜色（和3 = 4）。

initialStateArraySegmentedControl是你的segmentedControl的初始数组（单击时可能会命令，但是你需要初始数组），所以在你的init中试试这个：

initialStateArraySegmentedControl = self.segmentedControl.subviews;
[self setColorForBackGround:self.segmentedControl withColor1:myUIColor1  withColor2:myUIColor2];

这最后一行是保持分段控件主视图周围的角落

和

- (void)myShineGradient:(UIView*)myView withColor1:(UIColor*)color1  withColor2:(UIColor*)color2
{
    //   remove old personal shine layer (if any exists):
    int layerNumberNow = [[myView.layer sublayers] count];
    if (layerNumberNow>2) {
        [[[myView.layer sublayers] objectAtIndex:0] removeFromSuperlayer];
    }
    // add shine layer
    CAGradientLayer *gradientLayer = [CAGradientLayer layer];

    [gradientLayer setBounds:[myView bounds]];
    // Center the layer inside the parent layer
    [gradientLayer setPosition:
     CGPointMake([myView bounds].size.width/2,
                 [myView bounds].size.height/2)];

    // Set the colors for the gradient to the 
    // two colors specified for high and low
    [gradientLayer setColors:
     [NSArray arrayWithObjects:
      (id)[color1 CGColor],(id)[color2 CGColor], nil]];
    [myView.layer insertSublayer:gradientLayer atIndex:layerNumberNow-2];


}
- (void)setColorForBackGround:(UIView*)myView withColor1:(UIColor*)color1 withColor2:(UIColor*)color2
{
    // add shine layer
    CAGradientLayer *gradientLayer = [CAGradientLayer layer];

    [gradientLayer setBounds:[myView bounds]];
    // Center the layer inside the parent layer
    [gradientLayer setPosition:
     CGPointMake([myView bounds].size.width/2,
                 [myView bounds].size.height/2)];

    // Set the colors for the gradient to the 
    // two colors specified for high and low
    [gradientLayer setColors:
     [NSArray arrayWithObjects:
      (id)[color1 CGColor],(id)[color2 CGColor], nil]];

    [myView.layer setBackgroundColor:[ [UIColor colorWithRed:0 green:0 blue:0 alpha:0] CGColor]];

    [myView.layer setCornerRadius:4];
    [[myView layer] setMasksToBounds:YES];

    // Display a border around the button
    // with a 1.0 pixel width

    [[myView layer] setBorderWidth:1.0f];
    [[myView layer] setBorderColor:[ [UIColor colorWithRed:1 green:1 blue:1 alpha:.1] CGColor] ];
    ///
}

PS 你需要导入石英框架

从UISegmentedControl中删除白色渐变

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