我正在开发一个联系人应用程序。我想通过打开这样的新 View 来添加联系人:
RootViewController.m... 它有一个名为 contacts 的 NSMutableArray
- (IBAction)addContact:(id)sender {
AddContViewController *cont = [[AddContViewController alloc]init];
[self.navigationController presentViewController:cont animated:YES completion:nil];
}
然后回来将联系人添加到 Root View Controller 的数组中:
AddContViewController.m
- (IBAction)acceptAction:(id)sender {
if ([[firstName text] length] < 1 && [[lastName text] length] < 1)
{
UIAlertView *alert = [[UIAlertView alloc]initWithTitle:@"Oh no!" message:@"Invalid contact information!" delegate:self cancelButtonTitle:@"Ok" otherButtonTitles: nil];
[alert show];
}
else{
//创建联系人并将其放入 Root View Controller 的数组中
Contact *cont = [[Contact alloc]initWithFirstName:[firstName text] lastName:[lastName text] andDOB:[dobPicker date]];
//现在我不知道该怎么办....
[self dismissViewControllerAnimated:YES completion:^{
UIAlertView *alert = [[UIAlertView alloc]initWithTitle:@"Success!" message:@"Contact added successfully!" delegate:self cancelButtonTitle:@"Ok" otherButtonTitles: nil];
[alert show];
}];
}
}
最佳答案
您应该使用委托(delegate)将新的 Contact 对象传达给您的 RootViewController。
定义协议(protocol)
@protocol AddContDelegate
-(void)didAddnewContact:(Contact *)contact;
@end
在您的 AddContViewController 上有一个委托(delegate)属性:
@property (nonatomic, assign) id<AddContDelegate> delegate;
在您的 addContact: 方法中分配委托(delegate):
- (IBAction)addContact:(id)sender {
AddContViewController *cont = [[AddContViewController alloc]init];
cont.delegate = self;
[self.navigationController presentViewController:cont animated:YES completion:nil];
}
在 RootViewController 中实现委托(delegate)方法:
-(void)didAddnewContact:(Contact *)contact {
[contacts addObject:contact];
}
从 AddContViewController 调用委托(delegate):
- (IBAction)acceptAction:(id)sender {
if ([[firstName text] length] < 1 && [[lastName text] length] < 1)
{
UIAlertView *alert = [[UIAlertView alloc]initWithTitle:@"Oh no!" message:@"Invalid contact information!" delegate:self cancelButtonTitle:@"Ok" otherButtonTitles: nil];
[alert show];
}
else{
Contact *cont = [[Contact alloc]initWithFirstName:[firstName text] lastName:[lastName text] andDOB:[dobPicker date]];
if([self.delegate respondsToSelector:@selector(didAddnewContact:)]) {
[self.delegate didAddnewContact:cont];
}
[self dismissViewControllerAnimated:YES completion:^{
UIAlertView *alert = [[UIAlertView alloc]initWithTitle:@"Success!" message:@"Contact added successfully!" delegate:self cancelButtonTitle:@"Ok" otherButtonTitles: nil];
[alert show];
}];
}
}
关于ios - 将数据传递给根 Controller ，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/12913565/