主要參考了這篇博客http://mobile.51cto.com/iphone-284116.htm
主要用到了，兩個類，一個delegate
a類，調用b類，當b類執行之后，需要把一個數據傳遞給a類，a類把這個數據顯示出來。
1.delegate,就這一個頭文件就足夠了。在類中去實現這個代理方法
#import <Foundation/Foundation.h>
@protocol UIViewPassValueDelegate
- (void)passValue:(NSString*)value;
一旦某個類，實現了這個回調函數，這個類就會獲取當前的value數據。因此，接收數據的類一定實現一個回調函數。對於當前項目就是passValue
@end
2.第一個頁面
.h文件
#import <UIKit/UIKit.h>
#import "UIViewPassValueDelegate.h"
#import "ValueInputView.h"
@interface DelegateSampleViewController : UIViewController<UIViewPassValueDelegate>
{
UITextField *_value;
}
@property (strong, nonatomic) IBOutletUITextField *value;
- (IBAction)buttonClick:(id)sender;
@end
.m文件
#import "DelegateSampleViewController.h"
@implementation DelegateSampleViewController
@synthesize value = _value;
- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
if (self) {
}
returnself;
}
- (void)viewDidLoad
{
[superviewDidLoad];
}
- (void)viewDidUnload
{
[self setValue: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.第二個類:
.h文件
#import <UIKit/UIKit.h>
#import "UIViewPassValueDelegate.h"
@interface ValueInputView : 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"
@implementation ValueInputView
@synthesize value=_value;
@synthesize delegate;
- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
if (self) {
// Custom initialization
}
returnself;
}
- (void)viewDidLoad
{
[superviewDidLoad];
}
- (void)viewDidUnload
{
[self setValue: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