|
1
|
2015
-
03
10
09
:
55
34.197
Test[
1140
29622
] Warning: Attempt to present <UIAlertController:
0x7c95ca20
> on <Test.ViewController:
0x7a6afc60
> whose view is not in the window hierarchy!
|
解决办法： 原来的调用代码是写在viewDidLoad方法中，这个表示视图加载完毕。我们应该把方法调用放到viewDidApper中，这个是UIViewController对象的视图已经加入到窗口时调用。
import
UIKit
class
ViewController
:
UIViewController
,
UIActionSheetDelegate
{
override
func
viewDidLoad() {
super
.viewDidLoad()
}
viewDidAppear(animated:
Bool
){
.viewDidAppear(animated)
var
alertController =
UIAlertController
(title:
"系统提示"
message:
"您确定要离开hangge.com吗？"
UIAlertControllerStyle
.
Alert
)
cancelAction =
UIAlertAction
"取消"
UIAlertActionStyle
Cancel
nil
)
okAction =
"好的"
Default
)
alertController.addAction(cancelAction)
alertController.addAction(okAction)
self
.presentViewController(alertController,animated:
true
)
}
didReceiveMemoryWarning() {
.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
}
|
原文出自： www.hangge.com 转载请保留原文链接： http://www.hangge.com/blog/cache/detail_652.html 原文链接：https://www.f2er.com/swift/324619.html
