UIAlertView Buttons(subviews) is not Showing in iOS 7

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 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 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;


  }

回答1:

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;

I have created a subclass of UIAlerView :

Header File :

@interface MLKLoadingAlertView : UIAlertView

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

@end

Implementation File :

#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 method I have added the subviews to UIAlertView by accessing Presented View Controller's view.

You can find explanation and code example for this on Here

回答2:

What you were doing was always wrong. You are not allowed to add your own subviews to a UIAlertView. The good news is - in iOS 7, you don't have to! The new custom transition animation mechanism lets you make your own view that behaves just an alert view, but since it is your view, you can put anything you like into it, like this:

Note how the fake "alert view" floats in front of the original view in the screen shot on the right, and dims the screen behind it, just like a real alert view. But it is made up entirely of custom content; a "real" alert view could never contain an image and a switch!

For the code that creates this view, which you can easily adapt to your own purposes, see my github site: https://github.com/mattneub/custom-alert-view-iOS7

回答3:

I think the root of the problem in iOS7 that Apple changed the UIAlertView appearance mechanism. From now any show of alertView follows after initiating of two private view controllers

_UIModalItemAppViewController
_UIModalItemsPresentingViewController

In other words, now UIAlertView is not a pure view - it is a part of some complicated collection of view controllers with full view controller life cycle.

But a good news that you can change accessoryView to your customContentView in a standard alert view

[alertView setValue:customContentView forKey:@"accessoryView"];

Note that you must call this before [alertView show].

来源：https://stackoverflow.com/questions/18964046/uialertview-buttonssubviews-is-not-showing-in-ios-7

标签

iphone

objective-c

uialertview

ios7