我刚刚在App Store上发布了我的应用程序,但我刚收到电子邮件,并告知崩溃存在问题.
问题在于警报视图会在我们的应用程序出现时崩溃(仅在iOS 7中).我有一些应该修复此问题的代码,但它似乎不适用于某些版本的iOS 7.
这是我目前的代码：
@IBAction func resetAllButton(sender : AnyObject) {
//If statement to check whether the modern style alert is available. Prior to iOS 8 it is not.
if let gotModernAlert: AnyClass = NSClassFromString("UIAlertController") {
println("UIAlertController can be instantiated")
var alert = UIAlertController(title: "Start Over",message: "Are you sure you want to start over? This will erase your budget and all transactions.",preferredStyle: UIAlertControllerStyle.Alert)
alert.addAction(UIAlertAction(title: "I'm sure!",style: UIAlertActionStyle.Default,handler:{ (ACTION :UIAlertAction!)in
self.resetView()
}))
alert.addAction(UIAlertAction(title: "Cancel",style: UIAlertActionStyle.Cancel,handler: nil))
self.presentViewController(alert,animated: true,completion: nil)
}
else {
println("UIAlertController can NOT be instantiated")
var alertView = UIAlertView()
alertView.delegate = self
alertView.title = "Start Over"
alertView.message = "Are you sure you want to start over? This will erase your budget and all transactions."
alertView.addButtonWithTitle("I'm sure!")
alertView.addButtonWithTitle("Cancel")
alertView.show()
}
}
我该怎么做才能确保我的应用程序不会在任何版本的iOS 7或8上崩溃？
我在修复版本中遇到了同样的问题.
这似乎是swift编译器的内部错误(使用Xcode 6.0.1(6A317))
原文链接：https://www.f2er.com/swift/319963.html这似乎是swift编译器的内部错误(使用Xcode 6.0.1(6A317))
+ (BOOL) checkIfClassExists:(NSString *)className {
id c = objc_getClass([className cStringUsingEncoding:NSASCIIStringEncoding]);
if (c != nil) {
return YES;
} else {
return NO;
}
}
用我的swift代码调用了一个桥头
if ObjCFix.checkIfClassExists("UIAlertController") {
//iOS 8 code here
} else {
//iOS 7 code here
}
