如何在视图控制器之间传递对象 [英] how to pass objects between view controllers
本文介绍了如何在视图控制器之间传递对象的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
我有一个表视图列出运动员。当选择运动员时,我希望具有详细视图控制器(被推到堆栈上的控制器)以知道关于运动员的所有属性。他/她的姓名,生日,电话号码等。但是我不确定如何传递这些信息。
I have a table view that lists athletes. when an athlete is selected, I wish to have the detail view controller (the controller that is pushed onto the stack) to know all the attributes about the athlete. his/her name, birthday, phone number, etc. But im unsure on how to pass this information.
allathletes.h
allathletes.h
-(void)viewWillAppear:(BOOL)animated{
AppDelegate *appDelegate = [[UIApplication sharedApplication] delegate];
_managedObjectContext = [appDelegate managedObjectContext];
NSFetchRequest *request = [[NSFetchRequest alloc] init];
NSEntityDescription *athlete = [NSEntityDescription entityForName:@"Athlete" inManagedObjectContext:_managedObjectContext];
[request setEntity:athlete];
NSSortDescriptor *sortDescriptor = [[NSSortDescriptor alloc] initWithKey:@"last" ascending:YES];
NSArray *sortDescriptors = [[NSArray alloc]initWithObjects:sortDescriptor, nil];
[request setSortDescriptors:sortDescriptors];
NSError *error = nil;
NSMutableArray *mutableFetchResults = [[_managedObjectContext executeFetchRequest:request error:&error] mutableCopy];
if (mutableFetchResults == nil){
//handle error
}
[self setAthleteArray:mutableFetchResults];
[self.tableView reloadData];
}
-(void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender{
NSString *segueIdentifier = [segue identifier];
if ([segueIdentifier isEqualToString:@"setAthlete"])
{
UINavigationController *navController = (UINavigationController *)[segue destinationViewController];
AllAthletes *athleteList = (AllAthletes *)[[navController viewControllers] lastObject];
//the line below gets an error :(
AthleteDetail.managedObjectContext = self.managedObjectContext;
}
}
推荐答案
我想你会想使用委托。这是一个很好的教程, href =https://www.youtube.com/watch?v=kFLK_1Shwe8 =nofollow>链接
I think you're going to want to use delegates. Here is a great tutorial on how to do that: Link
这篇关于如何在视图控制器之间传递对象的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持IT屋!
查看全文