Question

@implementation loadingViewController

- (void)viewDidLoad
{
    [super viewDidLoad];
    // send request
}

-(void)connectionDidFinishLoading:(NSURLConnection *)connection{

//inserting the response Data in database

[self performSegueWithIdentifier:@"loadingMenuSegue" sender:self];

}

@end

我有这个错误

* 断言失败 - [UIWindowController转换：fromViewController：toViewController：target：didEndSelector：]，/ SourceCache / UIKit_Sim / UIKit-1914.84 /UIWindowController.m：188

* 由于未捕获的异常'NSInternalInconsistencyException'而终止应用程序，原因：'尝试在转换已经进行时开始模式转换。等待viewDidAppear / viewDidDisappear知道当前转换已完成'

Answer 1

@implementation loadingViewController

- (void)viewDidLoad
{
    [super viewDidLoad];
    // send request
}

-(void)connectionDidFinishLoading:(NSURLConnection *)connection{

//inserting the response Data in database

//remove perform Segue from her, because the process is not finish yet
// [self performSegueWithIdentifier:@"loadingMenuSegue" sender:self];

}

-(void)viewDidAppear:(BOOL)animated{
    [super viewDidAppear:animated];
    [self performSegueWithIdentifier:@"loadingMenuSegue" sender:self];
}

@end

Answer 2

该错误可能表示您在connectionDidFinishLoading:之前调用了viewDidAppear:方法。由于此时无法执行segue，您可能希望在ivar或属性中保持某种状态（以便知道连接已完成），然后在viewDidAppear:实现中可以测试该状态并在需要时执行segue。

我执行SegueWithIdentifier时出错

2 个答案: