UIAlertAction值列表

Question

我想知道如何更改UIAlertAction标题的字体。我假设，这可以通过为特定键设置一个值来完成。例如，要设置图像，您可以执行以下操作：

action.setValue(image, forKey: "image")

是否有所有可用密钥的列表？我不知道该用哪个键来更改字体、左对齐/右对齐标题等。

Answer 1

class_copyIvarList可能正是您所需要的。

斯威夫特

extension UIAlertAction {
    static var propertyNames: [String] {
        var outCount: UInt32 = 0
        guard let ivars = class_copyIvarList(self, &outCount) else {
            return []
        }
        var result = [String]()
        let count = Int(outCount)
        for i in 0..<count {
            let pro: Ivar = ivars[i]
            guard let ivarName = ivar_getName(pro) else {
                continue
            }
            guard let name = String(utf8String: ivarName) else {
                continue
            }
            result.append(name)
        }
        return result
    }
}

然后

print(UIAlertAction.propertyNames)

输出结果是

["_title", "_titleTextAlignment", "_enabled", "_checked", "_isPreferred", "_imageTintColor", "_titleTextColor", "_style", "_handler", "_simpleHandler", "_image", "_shouldDismissHandler", "__descriptiveText", "_contentViewController", "_keyCommandInput", "_keyCommandModifierFlags", "__representer", "__interfaceActionRepresentation", "__alertController"]

Answer 2

您可以使用它来更改UIAlertAction标题的颜色。

 UIAlertController *alertController = [UIAlertController
                                          alertControllerWithTitle:@"alert view"
                                          message:@"hello alert controller"
                                          preferredStyle:UIAlertControllerStyleAlert];

    alertController.view.tintColor = [UIColor greenColor];

    UIAlertAction *cancelAction = [UIAlertAction
                                   actionWithTitle:@"Cancel"
                                   style:UIAlertActionStyleCancel
                                   handler:^(UIAlertAction *action)
                                   {

                                   }];
    [alertController addAction:cancelAction];

    [self.navigationController presentViewController: alertController animated:YES completion:nil];

或

检查此链接-UIAlertController custom font, size, color