如何在UIAlertView(iOS)中的其他两个按钮(堆叠)之间添加“取消"按钮 [英] How to add Cancel button between two other buttons (stacked) in UIAlertView (iOS)

问题描述

我试图用三个按钮(将被堆叠)创建一个UIAlertView.我希望取消"按钮位于其他两个按钮之间.我已经尝试将cancelButtonIndex设置为1，但是如果还有其他两个按钮，则将它们简单地放置在索引0和1上.我知道我可以更改按钮的名称，但是我想取消按钮的颜色为深蓝色

**请注意-我知道如何以正确的顺序获得带有标题的三个按钮，但前提是所有三个按钮本质上看起来都像其他"按钮；我希望取消按钮具有取消按钮深蓝色背景，以便它看起来像常规的取消按钮.**

我尝试过

  UIAlertView * alert = [[[[UIAlertView alloc] initWithTitle:title消息:msg委托:self cancelButtonTitle:@取消" otherButtonTitles:button1Title，button2Title，nil]自动释放];alert.cancelButtonIndex = 1;[警报显示]； 

和

  UIAlertView * alert = [[[[UIAlertView alloc] initWithTitle:title消息:msg委托:self cancelButtonTitle:@取消" otherButtonTitles:nil]自动释放];alert.cancelButtonIndex = 1;[alert addButtonWithTitle:button1Title];[alert addButtonWithTitle:button2Title];[警报显示]； 

和

  UIAlertView * alert = [[[[UIAlertView alloc] initWithTitle:title消息:msg委托:self cancelButtonTitle:@取消" otherButtonTitles:addButtonWithTitle:button1Title，nil]自动释放];alert.cancelButtonIndex = 1;[alert addButtonWithTitle:button2Title];[警报显示]； 

无济于事.甚至有可能完成我想做的事情?

解决方案

此答案有两个辅助点.

1)据我所知，Apple并未拒绝对 UIAlertView 进行合理修改的应用程序；他们说过，像 UIAlertView 这样的类的视图层次结构应该被视为私有的.

2)这个问题很好地说明了为什么您应该问更多关于最终目标的问题，而不是要达到目标的步骤.我知道这个问题的唯一原因是此处.>

答案:

由于您的评论，我知道您希望创建一个 UIAlertView ，即使只有2个按钮，它也具有堆叠的按钮.

我发现这样的代码最合逻辑的位置是在类别中.由于通常操纵警报视图所需的代码需要围绕 show 调用，因此我创建了我调用的类别方法，而不是 show ，该方法又调用了显示本身.

 -(void)showWithButtonsStacked {静态NSString * tempButtonTitle = @"SomeUnlikelyToBeUsedTitle";BOOL willAddFakeButton =(self.numberOfButtons == 2);//只有2个按钮并排如果(willAddFakeButton){self.clipsToBounds = YES;[self addButtonWithTitle:tempButtonTitle];//添加临时按钮，以便Alertview可以堆叠}布尔hasCancelButton =(self.cancelButtonIndex！= -1);//如果有一个取消按钮，我们不想切断它[自我展示]；如果(willAddFakeButton){UIButton * cancelButton = nil;UIButton * tempButton = nil;对于(UIButton * self.subviews中的按钮){如果([button isKindOfClass:[UIButton类]]){如果(hasCancelButton&& [button.titleLabel.text isEqualToString:[self buttonTitleAtIndex:self.cancelButtonIndex]]){cancelButton =按钮；}否则，如果([button.titleLabel.text isEqualToString:tempButtonTitle]){tempButton =按钮;}}}if(hasCancelButton){//移动取消按钮cancelButton.frame = tempButton.frame;}[tempButton removeFromSuperview];//查找仍然可见的最低按钮.CGRect minimumButtonFrame = CGRectZero;对于(UIButton * self.subviews中的按钮){如果([button isKindOfClass:[UIButton类]]){如果(button.frame.origin.y> lowestButtonFrame.origin.y){minimumButtonFrame = button.frame;}}}//根据最低按钮框确定警报视图的新高度CGFloat newHeight = CGRectGetMaxY(lowestButtonFrame)+(lowestButtonFrame.origin.x * 1.5);self.bounds = CGRectMake(0，0，self.bounds.size.width，newHeight);}} 

此方法完成目标的方法是在警报视图中添加一个临时按钮，以强制警报视图堆叠按钮，然后删除该临时按钮并调整高度.由于它是一种分类方法，因此只需调用以下方法即可使用它:

  UIAlertView * alert = [[UIAlertView alloc] initWithTitle:@测试标题"消息:@消息"委托:自我cancelButtonTitle:@取消" otherButtonTitles:@"OK"，无]；[alert showWithButtonsStacked]; 

此代码会产生如下警报:

I am trying to create a UIAlertView with three buttons (which will be stacked). I would like the Cancel button to be in the middle, between the two other buttons. I have tried setting the cancelButtonIndex to 1, but if there are two other buttons, it simply places them at indexes 0 and 1. I know I could just change the names of the buttons, but I want the darker blue formatting of the cancel button.

EDIT: ** Please note - I know how to get the three buttons with the titles in the correct order, but only if all three buttons essentially look like 'other' buttons; I want the cancel button to have the cancel button dark blue background so that it will look like a regular cancel button. **

I've tried

UIAlertView *alert = [[[UIAlertView alloc] initWithTitle:title message:msg delegate:self cancelButtonTitle:@"Cancel" otherButtonTitles:button1Title,button2Title,nil] autorelease];
alert.cancelButtonIndex = 1;
[alert show];

and

UIAlertView *alert = [[[UIAlertView alloc] initWithTitle:title message:msg delegate:self cancelButtonTitle:@"Cancel" otherButtonTitles:nil] autorelease];
alert.cancelButtonIndex = 1;
[alert addButtonWithTitle:button1Title];
[alert addButtonWithTitle:button2Title];
[alert show];

and

UIAlertView *alert = [[[UIAlertView alloc] initWithTitle:title message:msg delegate:self cancelButtonTitle:@"Cancel" otherButtonTitles:addButtonWithTitle:button1Title,nil] autorelease];
alert.cancelButtonIndex = 1;
[alert addButtonWithTitle:button2Title];
[alert show];

to no avail. Is it even possible to accomplish what I am trying to do?

解决方案

I have two ancillary points to this answer.

1) While, to the best of my knowledge, Apple has not rejected an app for reasonable modification of a UIAlertView; They have said that the view hierarchy of classes like UIAlertView should be considered private.

2) This question is a good example of why you should ask a question more about your end goal rather than the steps to get there. The only reason I know what this question is about is as a result of a comment left at my answer here.

Answer:

Because of your comment I know that you are looking to create a UIAlertView that has stacked buttons even when there are only 2 buttons.

I find the most logical place for code like this is in a category. Since generally the code needed to manipulate the alert-view needs to be around the show call, I created a category method I call instead of show and the method in turn calls show itself.

-(void)showWithButtonsStacked{
    static NSString *tempButtonTitle = @"SomeUnlikelyToBeUsedTitle";
    BOOL willAddFakeButton = (self.numberOfButtons == 2); // Button are only side by side when there's 2
    if (willAddFakeButton){
        self.clipsToBounds = YES;
        [self addButtonWithTitle:tempButtonTitle]; // add temp button so the alertview will stack
    }
    BOOL hasCancelButton = (self.cancelButtonIndex != -1); // If there is a cancel button we don't want to cut it off
    [self show];
    if (willAddFakeButton){
        UIButton *cancelButton = nil;
        UIButton *tempButton = nil;
        for (UIButton *button in self.subviews) {
            if ([button isKindOfClass:[UIButton class]]){
                if (hasCancelButton && [button.titleLabel.text isEqualToString:[self buttonTitleAtIndex:self.cancelButtonIndex]]){
                    cancelButton = button;
                } else if ([button.titleLabel.text isEqualToString:tempButtonTitle]) {
                    tempButton = button;
                }
            }
        }
        if (hasCancelButton){ // move in cancel button
            cancelButton.frame = tempButton.frame;
        }
        [tempButton removeFromSuperview];

        // Find lowest button still visable.
        CGRect lowestButtonFrame = CGRectZero;
        for (UIButton *button in self.subviews) {
            if ([button isKindOfClass:[UIButton class]]){
                if (button.frame.origin.y > lowestButtonFrame.origin.y){
                    lowestButtonFrame = button.frame;
                }
            }
        }

        // determine new height of the alert view based on the lowest button frame
        CGFloat newHeight = CGRectGetMaxY(lowestButtonFrame) + (lowestButtonFrame.origin.x * 1.5);
        self.bounds = CGRectMake(0, 0, self.bounds.size.width, newHeight);        
    }
}

The way this method accomplishes it's goal is to add a temporary button to the alert-view to force the alert-view to stack the buttons, then it removes the temporary button and adjusts the height. Since it's a category method you use it simply by calling:

UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Test title" message:@"message" delegate:self cancelButtonTitle:@"Cancel" otherButtonTitles:@"OK", nil];
[alert showWithButtonsStacked];

This code results in an alert like this:

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