在iOS 8中自定义UIAlertController以包含UITableView等标准元素

问题描述

我习惯通过[警报setValue：someView forKey：@accessoryView] 方法自定义 UIAlertViews 。这为自定义高度的UIAlertViews创建了可自定义的内容。但它只适用于iOS7及以下版本。在iOS8中， UIAlertController 已经接管，我无法再自定义它，它将削减 UIAlertView 的高度。

I am used to customize UIAlertViews through the [alert setValue:someView forKey:@"accessoryView"] method. This creates customizable content for UIAlertViews with custom heights. However it only works on iOS7 and down. In iOS8 the UIAlertController have taken over, and I cannot customize it anymore, it will cut the height of the UIAlertView.

由于滥用 UIAlertController 而不可能，或者我该怎么做？
我试图在UIAlertController中加入一个UITableView，其中包含 UIAlertControllerStyleAlert 。

Is it impossible because of misuse of the UIAlertController, or how am I supposed to do it?I am trying to incorporate a UITableView inside a UIAlertController with UIAlertControllerStyleAlert.

Thx。

推荐答案

我现在遇到了同样的问题。我查看了UIAlertController的私有标头（）并找到了一个很有前途的属性： contentViewController

I ran into the same issue right now. I looked at the private header for UIAlertController (https://github.com/nst/iOS-Runtime-Headers/blob/master/Frameworks/UIKit.framework/UIAlertController.h) and found a promising property: contentViewController

结果与UIAlertView的 accessoryView 完全相同，不同之处在于你需要将UIViewController分配给此属性而不是UIView。

And it turned out to be exactly the same as accessoryView used to be for UIAlertView, the difference being that you need to assign a UIViewController to this property rather than a UIView.

UIViewController *v = [[UIViewController alloc] init];
v.view.backgroundColor = [UIColor redColor];

[alertController setValue:v forKey:@"contentViewController"];

这段代码将在警报视图中显示红色视图！快乐的UIAlertController定制;）

That piece of code will show a red view on the alert view! Happy UIAlertController customizing ;)

PS。这是一个私有财产，但使用KVC应该不会有问题App Store明智，我认为。

PS. It is a private property but using KVC there shouldn't be a problem App Store wise, I think.

编辑：

有些人抱怨说这不太安全。它不是公共API，所以是的，Apple可以在任何版本中更改它，导致此方法失败。

Some people complained that this isn't very safe. It's not a public API, so yes, Apple could change it in any release, causing this method to fail.

确保整个应用程序不会崩溃您可以将KVC调用包装在 try 块中。如果属性发生变化，您的控制器将不会显示内容视图，但也不会崩溃：

To make sure your entire app doesn't crash if that happens you could wrap the KVC call in a try block. If the property changes your controller won't show the content view, but it also won't crash:

@try {
    [alertController setValue:v forKey:@"contentViewController"];
}
@catch(NSException *exception) {
    NSLog(@"Failed setting content view controller: %@", exception);
}

在生产中使用此方法可能存在风险，我不推荐它重要警报。

Using this method in production can be risky, and I don't recommend it for important alerts.

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