UIAlertView按钮(子视图)未在iOS 7中显示

Question

UIAlertView在ios 6中使用以下代码正常工作.但是当涉及ios 7时,子视图(我的代码中的"是"和"否"按钮)没有显示当调用alertview时只显示文本消息.任何人都可以告诉我如何解决这个问题？

viewController.m文件

 [Utilities prCustomAlert:@"Textmessage" inTitle:@"Alert view title" delegate:self inTag:300];
 CustomAlertView *alertView    = [Utilities sharedUtility].customAlertView;
alertView.numberOfBtns  = 2;
UIButton *btn= (UIButton *)[alertView viewWithTag:10];
[btn setTitle:@"no" forState:UIControlStateNormal];
[btn addTarget:self action:@selector(dontlogout) forControlEvents:UIControlEventTouchDown];

btn = (UIButton *)[alertView viewWithTag:11];
[btn setTitle:@"yes" forState:UIControlStateNormal];
[btn addTarget:self action:@selector(logout) forControlEvents:UIControlEventTouchDown];    
[Utilities displayCustomAlertForDelegate:self];

UIAlertView.m文件

  CGRect viewFrame    = self.frame;
  CGRect buttonFrame  = button.frame;
  if(self.numberOfBtns==2){

  CGRect labelFrame   = [self viewWithTag:15].frame;        
  button.frame    = CGRectMake(10, 0, 40, 30);
        button.hidden   = NO;

        //yes...
        btn          = (UIButton *)[self viewWithTag:11];       
        btn.frame    = CGRectMake(60, 0, 40, 30);
        btn.hidden   = NO;

        //no..    
        btn          = (UIButton *)[self viewWithTag:10];
        btn.hidden   = YES;


  }

Answer 1

当呈现 UIAlertView 时，我们可以通过将子视图添加到presentedViewController 的视图来将子视图添加到UIAlerView。我已经通过以下方式访问了 UIAlertView ：

NSArray *subviews = [UIApplication共享应用程序].keyWindow.rootViewController.presentedViewController.view.subviews;

我创建了 UIAlerView 的子类：

头文件：

@interface MLKLoadingAlertView : UIAlertView

- (id)initWithTitle:(NSString *)title;

@end

实施文件：

#import "MLKLoadingAlertView.h"

#define ACTIVITY_INDICATOR_CENTER   CGPointMake(130, 90)

@implementation MLKLoadingAlertView

- (id)initWithTitle:(NSString *)title
{
    if ( self = [super init] )
    {
        self.title = title;
        self.message = @"\n\n";

        [self setDelegate:self];
    }

    return self;
}

// You can Customise this based on your requirement by adding subviews.
- (void)didPresentAlertView:(UIAlertView *)alertView
{
    NSArray *subviews = [UIApplication sharedApplication].keyWindow.rootViewController.presentedViewController.view.subviews;

    if( subviews.count > 1 )
    {
        // iOS while presenting an alertview uses a presening view controller. That controller's view has several subviews. I have picked one
        // subview from it which has frame similar to the alertview frame.
        UIView *presentedView = [subviews objectAtIndex:1];

         UIActivityIndicatorView *customActivityIndicator = [[UIActivityIndicatorView alloc] initWithActivityIndicatorStyle:UIActivityIndicatorViewStyleGray];
        [customActivityIndicator startAnimating];
        customActivityIndicator.center = ACTIVITY_INDICATOR_CENTER;

        [presentedView addSubview:customActivityIndicator];
    }
}

@end

在 - (void)didPresentAlertView:(UIAlertView *)alertView 方法中，我通过访问呈现视图控制器的视图将子视图添加到 UIAlertView 中。

您可以在此处找到相关说明和代码示例