关于使用模态视图时出现警告和报错的问题

1.A视图控制器:

BViewController *BVC = [[BViewController alloc]init];
[self presentViewController:BVC animated:YES completion:nil];

 

2.B视图控制器:

运行APP,点击左上角的返回按钮时,调用 

[self dismissViewControllerAnimated:YES completion:nil];

 

控制台提示警告:

Warning: Attempt to present <ModalViewController> on <ViewController>while a presentation is in progress

 

3.我修改了A视图控制器:

if(_BVC == nil){
    _BVC = [[BViewController alloc]init];
}
[self presentViewController:BVC animated:YES completion:nil];

 

运行APP,点击B视图控制器左上角的返回按钮,程序报错:

exception.reason: Application tried to present modally an active controller

 

4.在百度找到一贴,修改A视图控制器:

if(_BVC == nil){
    _BVC = [[BViewController alloc]init];
}

if (self.presentedViewController == nil) {
    [self presentViewController:BVC animated:YES completion:nil];
}

 

posted @ 2014-11-14 10:52  2014_4_30  阅读(338)  评论(0编辑  收藏  举报