找到UIAlertView而不参考它 [英] Find UIAlertView without having reference to it

问题描述

我正在编写应用程序测试，并想检查当前是否显示了UIAlertView。这意味着我没有指向它的指针，我需要知道谁是所显示的UIAlertView的所有者，或者可以找到它的视图堆栈。

I'm writing application tests and want to check if an UIAlertView is currently shown. That means I don't have a pointer to it and I need to know who is the owner of the shown UIAlertView or on which views stack it can be found.

推荐答案

[ UPDATE ]实际上，下面的解决方案不适用于iOS 7，因为警报视图不再绑定到特定窗口。有关详细信息，请阅读此处： https://stackoverflow.com/a/18703524/942107

[UPDATE] Actually the solution below is not working for iOS 7, because the alert views are not bound to a specific window any more. Read here for details: https://stackoverflow.com/a/18703524/942107

根据KennyTM的建议在Sebastien提供链接的另一个问题中，我创建了一个UIAlertView类，其中一个方法返回UIAlertView，如果显示它能够以编程方式解除它。

Based on KennyTM'm advice in another question Sebastien provided link to, I've created a UIAlertView category with a method returning the UIAlertView if shown to be able to dismiss it programatically.

UIAlertViewAdditions.h：

#import <UIKit/UIKit.h>

@interface UIAlertView (UIAlertViewAdditions)

+ (UIAlertView *) getUIAlertViewIfShown;

@end

UIAlertViewAdditions.m：

#import "UIAlertViewAdditions.h"

@implementation UIAlertView (UIAlertViewAdditions)

+ (UIAlertView *) getUIAlertViewIfShown {
    if ([[[UIApplication sharedApplication] windows] count] == 1) {
        return nil;
    }

    UIWindow *window = [[[UIApplication sharedApplication] windows] objectAtIndex:1];
    if ([window.subviews count] > 0) {
        UIView *view = [window.subviews objectAtIndex:0];
        if ([view isKindOfClass:[UIAlertView class]]) {
            return (UIAlertView *) view;
        }
    }
    return nil;
}

@end

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