ios 页面跳转之间传递数据----通过delegate

主要参考了这篇博客http://mobile.51cto.com/iphone-284116.htm

主要用到了，两个类，一个delegate

a类，调用b类，当b类执行之后，需要把一个数据传递给a类，a类把这个数据显示出来。

1.delegate,就这一个头文件就足够了。在类中去实现这个代理方法

#import <Foundation/Foundation.h>

@protocolUIViewPassValueDelegate

- (void)passValue:(NSString*)value;

一旦某个类，实现了这个回调函数，这个类就会获取当前的value数据。因此，接收数据的类一定实现一个回调函数。对于当前项目就是passValue

@end

2.第一个页面

.h文件

#import <UIKit/UIKit.h>

#import "UIViewPassValueDelegate.h"

#import "ValueInputView.h"

 @interfaceDelegateSampleViewController : UIViewController<UIViewPassValueDelegate>

{

    UITextField*_value;

}

@property(strong, nonatomic) IBOutletUITextField*value;

- (IBAction)buttonClick:(id)sender;

@end

.m文件

#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.第二个类:

.h文件

#import <UIKit/UIKit.h>

#import "UIViewPassValueDelegate.h"

 @interfaceValueInputView : UIViewController

{

    NSObject<UIViewPassValueDelegate>* delegate;

    UITextField* _value;

}

@property(retain, nonatomic) IBOutletUITextField*value;

@property(nonatomic,retain) NSObject<UIViewPassValueDelegate>* delegate;

- (IBAction)buttonClick:(id)sender;

@end

.m文件

#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

ios 页面跳转之间传递数据----通过delegate,,5-wow.com