xcode Swift 中的 UIAlertView，获取 EXC_BAD_ACCESS
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UIAlertView in Swift, getting EXC_BAD_ACCESS
提问by Brandon Buck
First and foremost, I'm quite aware that Xcode 6 and the Swift language are in Beta and are prone to errors; however, this particular one seems to be something strange as everything else I've tried so far seems to work fine.
首先，我很清楚 Xcode 6 和 Swift 语言处于 Beta 阶段，容易出错；然而，这个特殊的似乎有些奇怪，因为到目前为止我尝试过的所有其他方法似乎都可以正常工作。
If this is not appropriate for StackOverflow, I will gladly remove the question.
如果这不适合 StackOverflow，我很乐意删除这个问题。
I've begin playing with Xcode 6/Swift (preparing for its release) and it has been an extraordinarily enjoyable experience compared to what I thought it would be. That being said, one issue in porting a "training" style app I like to do is that I can't seem to generated a UIAlertView due to EXC_BAD_ACCESSthe code in question is:
我已经开始使用 Xcode 6/Swift（准备发布），与我想象的相比，这是一次非常愉快的体验。话虽如此，在移植我喜欢做的“培训”风格的应用程序时的一个问题是，由于EXC_BAD_ACCESS有问题的代码，我似乎无法生成 UIAlertView ：
override func viewDidAppear(animated: Bool) {
super.viewDidAppear(animated)
var alert = UIAlertView(title: "Title", message: "Message", delegate: nil, cancelButtonTitle: "OK") // EXC_BAD_ACCESS here
alert.show()
}
On the line that creates the UIAlertView I get an EXC_BAD_ACCESSbecause [UIAlertView retain]was called on a deallocated instance.
在创建 UIAlertView 的行上，我得到一个EXC_BAD_ACCESS因为[UIAlertView retain]在释放的实例上被调用。
Again, I'm chalking this up to the beta banner but was curious if I was doing something wrong or if anyone else has run into similar issues.
再一次，我把这归结为测试版横幅，但很好奇我是否做错了什么，或者其他人是否遇到了类似的问题。
回答by iPatel
Try the following code
试试下面的代码
let alert = UIAlertView()
alert.title = "Title"
alert.message = "My message"
alert.addButtonWithTitle("Ok")
alert.show()
But in iOS 8
但在 iOS 8
UIAlertViewis deprecated. So use UIAlertControllerwith a preferredStyleof UIAlertControllerStyleAlert. It should be:
UIAlertView已弃用。因此，使用UIAlertController了preferredStyle的UIAlertControllerStyleAlert。它应该是：
var alert = UIAlertController(title: "Title", message: "Message", preferredStyle: UIAlertControllerStyle.Alert)
alert.addAction(UIAlertAction(title: "Ok", style: UIAlertActionStyle.Default, handler: nil))
self.presentViewController(alert, animated: true, completion: nil)
Check the above code, are you getting same error or not ?
检查上面的代码，您是否遇到相同的错误？
回答by Brandon Buck
From Xcode 6.0 UIAlertView class:
从 Xcode 6.0 UIAlertView 类：
UIAlertView is deprecated. Use UIAlertController with a preferredStyle of UIAlertControllerStyleAlert instead.
UIAlertView 已弃用。使用 UIAlertController 和首选样式 UIAlertControllerStyleAlert 代替。
On swift ( iOS 8 and OS X 10.10 ), you can do this:
在 swift ( iOS 8 和 OS X 10.10 ) 上，你可以这样做：
var alert = UIAlertController(
title: "Send",
message: "You have successfully send your feedback.",
preferredStyle: UIAlertControllerStyle.Alert
)
alert.addAction(UIAlertAction(
title: "Ok",
style: UIAlertActionStyle.Default,
handler: nil
))
self.presentViewController(alert, animated: true, completion: nil)
回答by Divyang Shah
2 things u have to use delegate:self cancelButtonTitle ends with nil
你必须使用委托的 2 件事：self cancelButtonTitle 以 nil 结束
