iphone - 从UISegmentedControl移除白色渐变

如何在UISegmentedControl（栏样式）中摆脱或更改白色渐变？

最佳答案

我发现的唯一方法是在每个线段上绘制一层。
坏消息是，您每次更改时都必须自己为选定的段着色（并“取消殖民”未选中的段）
好消息是您可以为每个段设置许多不同的颜色，并在绿色附近显示红色，在蓝色附近显示...

您可以在segmentedControl更改时调用方法：

- (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是未选择的段的中性色（UIColor），而3 + 4是已选择的段
在您的情况下，如果只希望一种颜色，则将1 color =设置为第二种颜色（和3 = 4）。

initialStateArraySegmentedControl是segmentedControl的初始数组（单击时可能会出现顺序，但是您需要初始数组），因此在您的init中尝试以下操作：

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

最后一行是保持分段控制主视图周围的角

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] ];
    ///
}

聚苯乙烯
您需要导入石英框架

关于iphone - 从UISegmentedControl移除白色渐变，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/8551510/