UIAlertView按钮（子视图）未在iOS 7中显示

问题描述

UIAlertView在ios 6中运行正常，代码如下。但是当涉及到ios 7时，子视图（我的代码中的是和否按钮）在调用alertview时只显示正在显示文本消息.Can有谁告诉我如何解决这个问题？

UIAlertView is working fine in ios 6 with below code .But when it comes to ios 7 the subviews ( "yes" and "no" buttons in my code ) is not showing when alertview is called only text message is showing .Can anyone tell me how to resolve this problem ?

viewController.m文件

viewController.m file

 [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

UIAlertView.m file

  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;


  }

推荐答案

当呈现UIAlertView时，我们可以通过在presentViewController的视图中添加子视图来向UIAlerView添加子视图。我已按以下方式访问UIAlertView：

We can add subviews to UIAlerView by adding subview to the presentedViewController's view when UIAlertView is presented. I have accessed UIAlertView like following way :

NSArray * subviews = [UIApplication sharedApplication] .keyWindow.rootViewController.presentedViewController.view.subviews;

NSArray *subviews = [UIApplication sharedApplication].keyWindow.rootViewController.presentedViewController.view.subviews;

我创建了UIAlerView的子类：

I have created a subclass of UIAlerView :

头文件：

@interface MLKLoadingAlertView : UIAlertView

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

@end

实施档案：

#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

In - （void）didPresentAlertView：（UIAlertView *）alertView方法我已经通过访问Presented View Controller的视图将子视图添加到UIAlertView。

In - (void)didPresentAlertView:(UIAlertView *)alertView method I have added the subviews to UIAlertView by accessing Presented View Controller's view.

你可以找到这个的解释和代码示例在

You can find explanation and code example for this on Here

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