blocks|key|2466750|text|您的按钮操作方法应该具有如下签名：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2466751|+-(void)doSomething:(id)sender;|code-block|syntax|javascript|2466752|因此发送者将是按钮。在此基础上，您可以找出URL的含义。|2466753|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|L|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|M|8|@]|9|@]|A|$]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

Your button action method should have a signature like this:

<pre><code> -(void)doSomething:(id)sender;
</code></pre>

whereby sender will be the button. Based on this you could find out which URL is meant.

blocks|key|4547372|text|我建议您使用UIAlertView的子类，它能够跟踪更多的属性。我在我的所有项目中都是这样做的，而且它要简单得多。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|4547373|4547374|要做到这一点，一种解决方案是将UIAlertView子类化为MyAlertView，然后添加一个@property(nonatomic,+retain)+id+userInfo;或@property(nonatomic,+retain)+NSURL*+urlToOpen。因此，您可以将自定义数据附加到UIAlertView并在委托方法中检索它，以执行您需要的任何操作。|unordered-list-item|4547375|另一种解决方案，实际上也是我更喜欢的解决方案，是向UIAlertView添加Objective-C块支持，以便能够使用块API而不是delegate来使用UIAlertView。如果您在同一个类中使用多个UIAlertViews，并且具有相同的委托，这将特别有用，因为使用单个委托来处理不同的实例会非常混乱。|4547376|4547377|我个人一直在使用这种技术，因为它还使我的代码更具可读性，因为当您使用委托方法时，让按钮在显示警报的代码旁边执行，而不是将其放在完全不同的位置。|4547378|你可以看看我的OHAlertView+subclass+here+on+GitHub，它已经实现了这个功能。用法非常简单，允许您为每个警报视图使用块，而不是普通的委托，见下文。|4547379|4547380|使用示例|4547381|-(void)confirmOpenURL:(NSURL*)url
{
++NSString*+message+=+[NSString+string+WithFormat:@"Open+%25@+in+Safari?",
++++++++++++++++++++++++++++++++++++++++++++++++++url.absoluteString];
++[OHAlertView+showAlertWithTitle:@"Open+URL"
++++++++++++++++++++++++++message:message
+++++++++++++++++++++cancelButton:@"No"
+++++++++++++++++++++++++okButton:@"Yes"
+++++++++++++++++++onButtonTapped:%5E(OHAlertView*+alert,+NSInteger+buttonIndex)
++{
++++if+(buttonIndex+!=+alert.cancelButtonIndex)
++++{
+++++++//+If+user+tapped+"Yes"+and+not+"No"
+++++++[[UIApplication+sharedApplication]+openURL:url];
++++}
++}];
}|code-block|syntax|javascript|4547382|然后，每个按钮都可以有自己的操作：|4547383|-(IBAction)button1Action
{
++[self+confirmOpenURL:[NSURL+URLWithString:@"http://www.google.com"]];
}
-(IBAction)button2Action
{
++[self+confirmOpenURL:[NSURL+URLWithString:@"http://www.stackoverflow.com"]];
}|4547384|或者，您可以为所有打开URL的按钮提供一个通用的IBAction：|4547385|-(IBAction)commonButtonAction:(UIButton*)sender
{
+++NSUInteger+tag+=+sender.tag;
+++NSString*+urls[]+=+{+@"http://www.google.com",+@"http://www.stackoverflow.com"+};
+++NSURL*+buttonURL+=+[NSURL+URLWithString:+urls[tag]+];+//+in+practice+you+should+check+that+tag+is+between+0+and+the+number+of+urls+to+be+sure,+that's+just+an+example+here
+++[self+confirmOpenURL:buttonURL];
}|4547386|entityMap|0|LINK|mutability|MUTABLE|url|https://github.com/AliSoftware/OHAlertView-OHActionSheet^0|6|B|0|0|F|B|U|B|1C|15|2I|19|47|B|0|P|B|1U|8|25|B|2U|C|0|0|0|7|B|7|Z|0|0|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|1E|8|@$9|1F|A|1G|B|C]]|D|@]|E|$]]|$1|F|3|-4|5|6|7|1H|8|@]|D|@]|E|$]]|$1|G|3|H|5|I|7|1I|8|@$9|1J|A|1K|B|C]|$9|1L|A|1M|B|C]|$9|1N|A|1O|B|C]|$9|1P|A|1Q|B|C]|$9|1R|A|1S|B|C]]|D|@]|E|$]]|$1|J|3|K|5|I|7|1T|8|@$9|1U|A|1V|B|C]|$9|1W|A|1X|B|C]|$9|1Y|A|1Z|B|C]|$9|20|A|21|B|C]]|D|@]|E|$]]|$1|L|3|-4|5|6|7|22|8|@]|D|@]|E|$]]|$1|M|3|N|5|6|7|23|8|@]|D|@]|E|$]]|$1|O|3|P|5|6|7|24|8|@$9|25|A|26|B|C]]|D|@$9|27|A|28|1|29]]|E|$]]|$1|Q|3|-4|5|6|7|2A|8|@]|D|@]|E|$]]|$1|R|3|S|5|6|7|2B|8|@]|D|@]|E|$]]|$1|T|3|U|5|V|7|2C|8|@]|D|@]|E|$W|X]]|$1|Y|3|Z|5|6|7|2D|8|@]|D|@]|E|$]]|$1|10|3|11|5|V|7|2E|8|@]|D|@]|E|$W|X]]|$1|12|3|13|5|6|7|2F|8|@]|D|@]|E|$]]|$1|14|3|15|5|V|7|2G|8|@]|D|@]|E|$W|X]]|$1|16|3|-4|5|6|7|2H|8|@]|D|@]|E|$]]]|17|$18|$5|19|1A|1B|E|$1C|1D]]]]

I suggest that you use a subclass of <code>UIAlertView</code> that is able to track some more properties along. I do this in all my projects and it is much simpler.

<ul>
<li>One solution to do this would be to subclass <code>UIAlertView</code> to <code>MyAlertView</code> and add a <code>@property(nonatomic, retain) id userInfo;</code> or <code>@property(nonatomic, retain) NSURL* urlToOpen</code>. Thus you can attach custom data to your <code>UIAlertView</code> and retrieve it in the delegate method to do whatever you need with it.</li>
<li>Another solution, and my preferred one actually, is to add Objective-C blocks support to <code>UIAlertView</code>, to be able to use <code>UIAlertView</code> using the blocks API instead of using a <code>delegate</code>. This is particularly useful if you use multiple <code>UIAlertViews</code> in the same class and with the same delegate, as using a single delegate to handle the different instances is a mess.</li>
</ul>

I personally use this technique all the time, as it also makes my code more readable by having the code that executes when the button is tapped right next to the code that shows the alert, instead of having it at a complete different places when you use delegate methods.

You can look at my <a href="https://github.com/AliSoftware/OHAlertView-OHActionSheet" rel="nofollow"><code>OHAlertView</code> subclass here on GitHub</a> that implement this already. The usage is really simple and allow you to use blocks for each alert view instead of a common delegate, see below.

<hr>

<h3>Usage Example</h3>

<pre><code>-(void)confirmOpenURL:(NSURL*)url
{
 NSString* message = [NSString string WithFormat:@"Open %@ in Safari?",
 url.absoluteString];
 [OHAlertView showAlertWithTitle:@"Open URL"
 message:message
 cancelButton:@"No"
 okButton:@"Yes"
 onButtonTapped:^(OHAlertView* alert, NSInteger buttonIndex)
 {
 if (buttonIndex != alert.cancelButtonIndex)
 {
 // If user tapped "Yes" and not "No"
 [[UIApplication sharedApplication] openURL:url];
 }
 }];
}
</code></pre>

Then each button can have its own action:

<pre><code>-(IBAction)button1Action
{
 [self confirmOpenURL:[NSURL URLWithString:@"http://www.google.com"]];
}
-(IBAction)button2Action
{
 [self confirmOpenURL:[NSURL URLWithString:@"http://www.stackoverflow.com"]];
}
</code></pre>

Or you can have a common IBAction for all your buttons opening URLs:

<pre><code>-(IBAction)commonButtonAction:(UIButton*)sender
{
 NSUInteger tag = sender.tag;
 NSString* urls[] = { @"http://www.google.com", @"http://www.stackoverflow.com" };
 NSURL* buttonURL = [NSURL URLWithString: urls[tag] ]; // in practice you should check that tag is between 0 and the number of urls to be sure, that's just an example here
 [self confirmOpenURL:buttonURL];
}
</code></pre>

blocks|key|2823315|text|解决方法如下:在创建UIAlertView时添加一个tag。如下所示：|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|2823316|-+(IBAction)PressedButton+{

++++UIAlertView+*message+=+[[UIAlertView+alloc]+initWithTitle:@"Link"
++++++++++++++++++++++++++++++++++++++++++++++++++++++message:@"Want+to+open+in+safari?"
+++++++++++++++++++++++++++++++++++++++++++++++++++++delegate:self
++++++++++++++++++++++++++++++++++++++++++++cancelButtonTitle:@"Ok"
++++++++++++++++++++++++++++++++++++++++++++otherButtonTitles:nil];

++++message.tag+=+2;++++++++//different+tag+for+each+button

++++[message+addButtonWithTitle:@"Cancel"];
++++[message+show];

}|code-block|syntax|javascript|2823317|然后，当抛出-+(void)alertView:(UIAlertView+*)alertView+clickedButtonAtIndex:(NSInteger)buttonIndex委托时，我这样做了：|2823318|-+(void)alertView:(UIAlertView+*)alertView+clickedButtonAtIndex:(NSInteger)buttonIndex
{

++++if+(buttonIndex+==+alertView.cancelButtonIndex){

++++++++if+(alertView.tag+==+1)
++++++++{
++++++++++++//go+to+URL1
++++++++}

++++++++else+if+(alertView.tag+==+2)
++++++++{
+++++++++++++//go+to+URL2
++++++++}

++++++++else+if+(alertView.tag+==+3)
++++++++{
++++++++++++//go+to+URL3
++++++++}

++++}
}|2823319|entityMap^0|A|B|Q|3|0|0|6|2E|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@$9|R|A|S|B|C]|$9|T|A|U|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|V|8|@]|D|@]|E|$I|J]]|$1|K|3|L|5|6|7|W|8|@$9|X|A|Y|B|C]]|D|@]|E|$]]|$1|M|3|N|5|H|7|Z|8|@]|D|@]|E|$I|J]]|$1|O|3|-4|5|6|7|10|8|@]|D|@]|E|$]]]|P|$]]

Solved it like this:
added a <code>tag</code> when creating the <code>UIAlertView</code>. Like this:

<pre><code>- (IBAction)PressedButton {

 UIAlertView *message = [[UIAlertView alloc] initWithTitle:@"Link"
 message:@"Want to open in safari?"
 delegate:self
 cancelButtonTitle:@"Ok"
 otherButtonTitles:nil];

 message.tag = 2; //different tag for each button

 [message addButtonWithTitle:@"Cancel"];
 [message show];

}
</code></pre>

Then when <code>- (void)alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex</code> delegate was thrown I did this:

<pre><code>- (void)alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex
{

 if (buttonIndex == alertView.cancelButtonIndex){

 if (alertView.tag == 1)
 {
 //go to URL1
 }

 else if (alertView.tag == 2)
 {
 //go to URL2
 }

 else if (alertView.tag == 3)
 {
 //go to URL3
 }

 }
}
</code></pre>

Im trying to add a <code>UIAlertView</code> to warn the user that the link will open in <code>Safari</code>. The user can then choose OK(open the url) or cancel which should just close the alert and return to the links.
I have three different <code>UIButton</code>s which has 3 different <code>URL</code>s.

Right now ive added a <code>IBAction</code> to all buttons and all buttons has Tags (which i think i can use somehow :D). I guess <code>- (void)alertView:(UIAlertView *)alertView clickedButtonAtIndex:</code> delegate will be good to use to..

My question: how should the <code>UIAlertView</code> know what <code>URL</code> to open i user clicks ok?

confirmation before open in safari

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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我正在尝试添加一个UIAlertView来警告用户该链接将在Safari中打开。然后，用户可以选择OK(打开url)或cancel (取消)，这应该只是关闭警报并返回到链接。我有三个不同的UIButton，其中有三个不同的URL。现在，ive为所有按钮添加了一个IBAction，并且所有按钮都有标签(我想我可以通过某种...

问在safari中打开前的确认
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