ios UIAlterController的使用---注意presentViewController函数一定要延时执行
2016-04-13 10:22
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如果这样在一个普通的viewcontroller里面写的话,会报错误
whose view is not in the window hierarchy!
在storyboard中,由controller A跳转到controller B的时候然后报Warning: Attempt to present on whoseview is not in the window hierarchy!
问题参考:
http://stackoverflow.com/questions/11862883/whose-view-is-not-in-the-window-hierarchy
问题分析:
My presumption is that the view controller's view is not in the window hierarchy at the point
that it has been loaded (when the
but it is in the window hierarchy after
it has been presented (when the
补上中文分析:
结合自己的思考以及半通不通的英文水平,大致分析一下,应该是这么回事情,在controller a的viewDidLoad里面直接跳转controller
b,然后导致在显示controller b的时候也调用了controller a来显示,然后发现这个window的层次结构就错乱了。
问题解决:
在controller a中跳转的时候,要在viewDidLoad以及viewDidAppear之后才能跳转,所以可以自己想办法延时跳转,而不是直接跳转,延时的话,方法就很多了,可以用nstimer各种等等。
以上纯属菜鸟自己分析,如有不当,请各位大侠指正。
所以不能这样写:
UIAlertController *alertController = [UIAlertController
alertControllerWithTitle:@"aaa"
message:@"ddddd"
preferredStyle:UIAlertControllerStyleAlert];UIAlertAction *cancelAction = [UIAlertAction
actionWithTitle:@"取消"
style:UIAlertActionStyleCancel
handler:nil];UIAlertAction *certainAction = [UIAlertAction
actionWithTitle:@"确定"
style:UIAlertActionStyleDefault
handler:nil];[alertController
addAction:cancelAction];[alertController
addAction:certainAction];
self.alterVC = alertController;
// [self performSelector:@selector(delayMethod) withObject:nil afterDelay:1.0f];
[self
presentViewController:alertController
animated:YES
completion:nil];
需要这样写:
UIAlertController *alertController = [UIAlertController
alertControllerWithTitle:@"aaa"
message:@"ddddd"
preferredStyle:UIAlertControllerStyleAlert];UIAlertAction *cancelAction = [UIAlertAction
actionWithTitle:@"取消"
style:UIAlertActionStyleCancel
handler:nil];UIAlertAction *certainAction = [UIAlertAction
actionWithTitle:@"确定"
style:UIAlertActionStyleDefault
handler:nil];[alertController
addAction:cancelAction];[alertController
addAction:certainAction];
self.alterVC = alertController;
// [self performSelector:@selector(delayMethod) withObject:nil afterDelay:1.0f];
[self
presentViewController:alertController
animated:YES
completion:nil];
whose view is not in the window hierarchy!
在storyboard中,由controller A跳转到controller B的时候然后报Warning: Attempt to present on whoseview is not in the window hierarchy!
问题参考:
http://stackoverflow.com/questions/11862883/whose-view-is-not-in-the-window-hierarchy
问题分析:
My presumption is that the view controller's view is not in the window hierarchy at the point
that it has been loaded (when the
viewDidLoadmessage is sent),
but it is in the window hierarchy after
it has been presented (when the
viewDidAppear:message is sent).
补上中文分析:
结合自己的思考以及半通不通的英文水平,大致分析一下,应该是这么回事情,在controller a的viewDidLoad里面直接跳转controller
b,然后导致在显示controller b的时候也调用了controller a来显示,然后发现这个window的层次结构就错乱了。
问题解决:
在controller a中跳转的时候,要在viewDidLoad以及viewDidAppear之后才能跳转,所以可以自己想办法延时跳转,而不是直接跳转,延时的话,方法就很多了,可以用nstimer各种等等。
以上纯属菜鸟自己分析,如有不当,请各位大侠指正。
所以不能这样写:
UIAlertController *alertController = [UIAlertController
alertControllerWithTitle:@"aaa"
message:@"ddddd"
preferredStyle:UIAlertControllerStyleAlert];UIAlertAction *cancelAction = [UIAlertAction
actionWithTitle:@"取消"
style:UIAlertActionStyleCancel
handler:nil];UIAlertAction *certainAction = [UIAlertAction
actionWithTitle:@"确定"
style:UIAlertActionStyleDefault
handler:nil];[alertController
addAction:cancelAction];[alertController
addAction:certainAction];
self.alterVC = alertController;
// [self performSelector:@selector(delayMethod) withObject:nil afterDelay:1.0f];
[self
presentViewController:alertController
animated:YES
completion:nil];
需要这样写:
UIAlertController *alertController = [UIAlertController
alertControllerWithTitle:@"aaa"
message:@"ddddd"
preferredStyle:UIAlertControllerStyleAlert];UIAlertAction *cancelAction = [UIAlertAction
actionWithTitle:@"取消"
style:UIAlertActionStyleCancel
handler:nil];UIAlertAction *certainAction = [UIAlertAction
actionWithTitle:@"确定"
style:UIAlertActionStyleDefault
handler:nil];[alertController
addAction:cancelAction];[alertController
addAction:certainAction];
self.alterVC = alertController;
// [self performSelector:@selector(delayMethod) withObject:nil afterDelay:1.0f];
[self
presentViewController:alertController
animated:YES
completion:nil];
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