在UIAlertController中的操作下方显示空格

Question

8之前版本的iOS允许我创建一个UIActionsheet，它会显示一组按钮，一些空格，然后是一个取消按钮。像这样：

然而，在iOS 8中，当我尝试创建相同的外观时，我最终得到的结果如下：

iOS 8中的代码如下所示：

UIAlertController *alertVC = [UIAlertController alertControllerWithTitle:nil message:nil preferredStyle:UIAlertControllerStyleActionSheet];

[alertVC.view setTintColor:[UIColor copperColor]];

UIAlertAction* notifyViaPush = [UIAlertAction
                        actionWithTitle:@"Send Alert to my phone"
                       style:UIAlertActionStyleDefault
                       handler:^(UIAlertAction * action)
                        {
                            [alertVC dismissViewControllerAnimated:YES completion:nil];
                        }];
UIAlertAction* notifyViaEmail = [UIAlertAction
                         actionWithTitle:@"Notify me by email"
                         style:UIAlertActionStyleDefault
                         handler:^(UIAlertAction * action)
                        {
                            [alertVC dismissViewControllerAnimated:YES completion:nil];
                        }];
UIAlertAction* cancel = [UIAlertAction
                                 actionWithTitle:@"Cancel"
                                 style:UIAlertActionStyleCancel
                                 handler:^(UIAlertAction * action)
                                 {
                                     [alertVC dismissViewControllerAnimated:YES completion:nil];
                                 }];

[alertVC addAction:notifyViaPush];
[alertVC addAction:notifyViaEmail];
[alertVC addAction:cancel];

[self presentViewController:alertVC animated:YES completion:nil];

如何使用UIAlertController对按钮进行分组并在操作和取消按钮之间留出一些空间？

Answer 1

线alertVC.view.tintColor = [UIColor copperColor];导致问题，它使警报控制器的整个视图颜色相同，在第一张图片中取消按钮有白色背景。要解决此问题，请将此行移至函数末尾，即添加所有操作后。

Answer 2

对我来说，当我将样式设置为UIAlertActionStyleCancel上的UIAlertAction时，它就有用了。

在下面的代码中，action是UIAlertAction对象，而controller是带有样式操作表的UIAlertController。

UIAlertAction *action2 = [UIAlertAction actionWithTitle:@"No" style:UIAlertActionStyleCancel handler:^(UIAlertAction * _Nonnull action) {
            self.tabBarView.selectedIndex = 1;
            [self.tabBarView setSelectedIndex:self.tabBarView.selectedIndex];
        }];
        [controller addAction:action];
        [controller addAction:action2];

Answer 3

将要分开的操作按钮的style:参数设置为.cancel，而不是.default。

像style: .cancel

或更具体地说

// **style: on this is set to .cancel**
let cancelAction = UIAlertAction(title: "Cancel", style: .cancel) { (action) in }

通常是您命名为“取消”的按钮

我不确定按钮文字的颜色如何设置，即操作员说他在回答中所做的方式会影响动作分离的方式。我使用“ titleTextColor”操作来更改文本颜色，并且对操作员询问的间距没有影响。

cancelAction.setValue(UIColor.green, forKey: "titleTextColor")

这是4个步骤的代码

func presentActionSheet() {

    let actionSheet = UIAlertController(title: nil, message: nil, preferredStyle: .actionSheet)

    // 1. style: is set to .default on both of these which will keep them grouped
    let blockAction = UIAlertAction(title: "Block", style: .default) { (action) in }
    let reportAction = UIAlertAction(title: "Report", style: .default) { (action) in }

    // 2. style: is set to .cancel which will separate it from the other two actions
    let cancelAction = UIAlertAction(title: "Cancel", style: .cancel) { (action) in }

    // 3. set the colors for the action text
    blockAction.setValue(UIColor.brown, forKey: "titleTextColor")
    reportAction.setValue(UIColor.purple, forKey: "titleTextColor")
    cancelAction.setValue(UIColor.green, forKey: "titleTextColor")

    // 4. add the buttons to the action sheet and make sure the cancel button is last
    actionSheet.addAction(blockAction)
    actionSheet.addAction(reportAction)
    actionSheet.addAction(cancelAction)

    present(actionSheet, animated: true, completion: nil)
}