ios - UISegmentedControl 切换 View 它重置

Question

我有一个 UISegmentedControl 和两个 ViewController。每个页面上都有一个按钮，用于浏览两个 View ，但是当我将 Segmentcontrol 设置为某个 View 并返回时，它会重置为原始 View 。

这是我想要做的，第 1 页上的用户单击设置，然后 UISegmentedControl 选择配色方案并返回。 (但是我如何从 View #1 访问标签)

到目前为止，这是我的代码:

- (IBAction)colorController:(id)sender {

    if (Controller.selectedSegmentIndex == 0) {

        //App title text color
        appTitle.textColor =  [UIColor colorWithRed:1.00 green:1.00 blue:0.00 alpha:1.0];

        //Background color when selected
        Controller.tintColor = [UIColor colorWithRed:1.00 green:1.00 blue:0.00 alpha:1.0];

        //The font of the selected
        NSDictionary *fontColor = [NSDictionary dictionaryWithObjectsAndKeys:
                                   [UIColor blackColor],NSForegroundColorAttributeName,
                                   nil];
        [Controller setTitleTextAttributes:fontColor forState:UIControlStateSelected];


    }
    if (Controller.selectedSegmentIndex == 1) {

        //App title text color
        appTitle.textColor = [UIColor colorWithRed:0.00 green:0.66 blue:1.00 alpha:1.0];

        //Background color when selected
        Controller.tintColor = [UIColor colorWithRed:0.00 green:0.66 blue:1.00 alpha:1.0];

        //The font of the selected
        NSDictionary *fontColor = [NSDictionary dictionaryWithObjectsAndKeys:
                                   [UIColor whiteColor],NSForegroundColorAttributeName,
                                   nil];
        [Controller setTitleTextAttributes:fontColor forState:UIControlStateSelected];

    }
    if (Controller.selectedSegmentIndex == 2) {

        //App title text color
        appTitle.textColor = [UIColor colorWithRed:0.98 green:0.22 blue:0.22 alpha:1.0];

        //Background color when selected
        Controller.tintColor = [UIColor colorWithRed:0.98 green:0.22 blue:0.22 alpha:1.0];


        //The font of the selected
        NSDictionary *fontColor = [NSDictionary dictionaryWithObjectsAndKeys:
                                   [UIColor whiteColor],NSForegroundColorAttributeName,
                                   nil];
        [Controller setTitleTextAttributes:fontColor forState:UIControlStateSelected];
    }
    if (Controller.selectedSegmentIndex == 3) {

        //App title text color
        appTitle.textColor = [UIColor colorWithRed:0.15 green:0.82 blue:0.44 alpha:1.0];

        //Background color when selected
        Controller.tintColor = [UIColor colorWithRed:0.15 green:0.82 blue:0.44 alpha:1.0];

        //The font of the selected
        NSDictionary *fontColor = [NSDictionary dictionaryWithObjectsAndKeys:[UIColor whiteColor], NSForegroundColorAttributeName, nil];
        [Controller setTitleTextAttributes:fontColor forState:UIControlStateSelected];


    }
}

现在。 appTitle，在 View #1 上。所以我无法访问它。当我返回查看 #2 时，加上段控制重置。

Answer 1

View #2 可能在您返回 View #1 时被释放，假设您弹出或关闭以返回。当您再次转到 View #2 时，它是一个新实例，因此分段控件当然会显示默认选择。要更改第一个 Controller 中的标题属性，您应该使用在 Controller #2 中定义的委托(delegate)协议(protocol)。使用它将颜色和字体属性传递回 Controller #1，并让该 Controller 设置自己的标题特征。使用委托(delegate)模式将数据发送回之前的 Controller 是 Apple 通常使用的范例，您可以在文档中阅读相关内容。