use prepareForSegue for button

问题

Hi I create button programmatically and I connect my button to another view, but I got segue problem that I should use prepareForSegue method for storyboard but I don't know how there ar esome sample to the internet but I will get error when I used that sample, would you please help me

Thanks in advance!

here is my code

Creating Button

 UIButton * button = [UIButton buttonWithType:UIButtonTypeCustom]; 
        button.backgroundColor=[UIColor colorWithRed: 201.0/255.0 green: 201.0/255.0 blue:201.0/255.0 alpha: 1.0];
        button.tag = currentTag;
        currentTag++;
        [button.layer setBorderColor: [[UIColor blackColor] CGColor]];
        [button.layer setBorderWidth: 1.0];
        [button setTitle:[NSString stringWithFormat:@"%d",currentTag] forState:UIControlStateNormal];
        button.frame = CGRectMake(80*x, 32*y, 80, 32); 
        [button addTarget:self action:@selector(buttonPressed:) forControlEvents:UIControlEventTouchUpInside];
        [buttonView addSubview: button];

Action for button

-(void)buttonPressed:(UIButton *)button
{
NSLog(@"button %u -- frame: %@", button.tag, NSStringFromCGRect(button.frame));
WeekView *crtObj=[[WeekView alloc]initWithNibName:@"WeekView" bundle:nil];
[self.navigationController pushViewController:crtObj animated:YES];
[crtObj release];


}

Prepare for segue

- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender
{
if ([[segue identifier] isEqualToString:@"WeekView"]) {

        // Get reference to the destination view controller
       WeekView *vc = [segue destinationViewController];

        // Pass any objects to the view controller here, like...
        [vc setMyObjectHere:object];  //// I don't know what should I write instead of object
    }}

error

Edit 2:**** I have a warning :

Segues initiated directly from view controllers must have an identifier for use with -[UIViewController performSegueWithIdentifier:sender:]

- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender
{
if ([[segue identifier] isEqualToString:@"WeekView"]) {

        // Get reference to the destination view controller
     //  WeekView *vc = [segue destinationViewController];

        // Pass any objects to the view controller here, like...
       // [vc setMyObjectHere:object];
    [segue.destinationViewController setTitle:@"WeekView"];
    }}

回答1:

There are really two ways to push a view controller onto the navigation controller.

The old way, all in code. That is what you did. You can completely forget about segues at this point.
The new way: establish a Segue in Storyboard (push segue from one view controller to a new view controller, which you also define in Storyboard), give it an Identifier name and then use this code to push the view controller.

[self performSegueWithIdentifier:myIdentifyer sender:self];

where self is the view controller. Now you can do the customizations in prepareForSegue:.

回答2:

the sample code in this case is just telling you the type of thing you can do in prepareForSegue:sender: .

it is suggesting that the viewController to which you are attempting to segue would have a method setMyObjectHere: and it would be expecting you to pass that object.

as an example, your class might have a setTitle: method, and in the prepareForSegue:sender: code, you could pre-set the title based on information in the controller you are performing the segue from.

to get rid of the warning, you need an identifier, as in the picture below:

回答3:

"The old way to code", no the better way to code hopefully this helps, but if your using UIButtons and UIViews programmatically you shouldn't even be using segues.

Create a root view control in app delegate, than just pop on and off the next viewcontrollers and such.

For example this is all you need in your viewcontrollers:

-(void)nextControllerButton:(UIButton*)button{

    SearchViewController *nextController = [[SearchViewController alloc] init];

    nextController.username = _username.text;
    nextController.password = _password.text;

    [self.navigationController showViewController:nextController sender:self];
}

来源：https://stackoverflow.com/questions/11135047/use-prepareforsegue-for-button

标签

objective-c

ios

xcode

storyboard