Transfer Data between ios page jumps ---- use delegate

Transfer Data between ios page jumps ---- use delegate

 

Mainly used, two classes, one delegate

Class a: Class B is called. After Class B is executed, a data must be passed to Class a, and Class a displays the data.

1. delegate, this header file is enough. Implement this proxy method in the class

# Import

@ ProtocolUIViewPassValueDelegate

-(Void) passValue :( NSString *) value;

Once a class implements this callback function, this class will obtain the current value data. Therefore, the class that receives data must implement a callback function. The current project is passValue.

@ End

2. The first page

. H file

# Import

# Import UIViewPassValueDelegate. h

# Import ValueInputView. h

@ InterfaceDelegateSampleViewController: UIViewController

{

UITextField * _ value;

}

@ Property (strong, nonatomic) IBOutletUITextField * value;

-(IBAction) buttonClick :( id) sender;

@ End

. M file

# Import DelegateSampleViewController. h

@ ImplementationDelegateSampleViewController

@ Synthesizevalue = _ value;

-(Id) initWithNibName :( NSString *) nibNameOrNil bundle :( NSBundle *) nibBundleOrNil

{

Self = [superinitWithNibName: nibNameOrNil bundle: nibBundleOrNil];

If (self ){

}

Returnself;

}

-(Void) viewDidLoad

{

[SuperviewDidLoad];

}

-(Void) viewDidUnload

{

[SelfsetValue: nil];

[SuperviewDidUnload];

}

-(BOOL) shouldAutorotateToInterfaceOrientation :( UIInterfaceOrientation) interfaceOrientation

{

Return (interfaceOrientation = UIInterfaceOrientationPortrait );

}

 

-(IBAction) buttonClick :( id) sender

{

ValueInputView * valueView = [[ValueInputViewalloc] init];

ValueView. delegate = self;

[SelfsetModalTransitionStyle: UIModalTransitionStyleCoverVertical];

[SelfpresentModalViewController: valueView animated: YES];

}

-(Void) passValue :( NSString *) value

{

Self. value. text = value;

NSLog (@ the get value is % @, value );

}

@ End

3. Second Class:

. H file

# Import

# Import UIViewPassValueDelegate. h

@ InterfaceValueInputView: UIViewController

{

NSObject * Delegate;

UITextField * _ value;

}

@ Property (retain, nonatomic) IBOutletUITextField * value;

@ Property (nonatomic, retain) NSObject * Delegate;

-(IBAction) buttonClick :( id) sender;

@ End

. M file

# Import ValueInputView. h

 

@ ImplementationValueInputView

@ Synthesizevalue = _ value;

@ Synthesizedelegate;

 

-(Id) initWithNibName :( NSString *) nibNameOrNil bundle :( NSBundle *) nibBundleOrNil

{

Self = [superinitWithNibName: nibNameOrNil bundle: nibBundleOrNil];

If (self ){

// Custom initialization

}

Returnself;

}

-(Void) viewDidLoad

{

[SuperviewDidLoad];

}

-(Void) viewDidUnload

{

[SelfsetValue: nil];

[SuperviewDidUnload];

}

-(BOOL) shouldAutorotateToInterfaceOrientation :( UIInterfaceOrientation) interfaceOrientation

{

Return (interfaceOrientation = UIInterfaceOrientationPortrait );

}

-(IBAction) buttonClick :( id) sender {

[DelegatepassValue: self. value. text];

NSLog (@ self. value. text is % @, self. value. text );

[SelfdismissModalViewControllerAnimated: YES];

}

@ End