ios中利用委托在二个视图间传值

1、定义协议

UIViewPassValueDelegate.h

#import <Foundation/Foundation.h>

@protocol UIViewPassValueDelegate <NSObject>
-(void)passValue:(NSString *)value1;
@end

2、A视图定义

#import "UIViewPassValueDelegate.h"

@interface AViewController : UIViewController<UIViewPassValueDelegate>

-(IBAction)buttonClick:(id)sender;

-(void)passValue:(NSString *)value1{
    NSLog(@"A get value is %@",value1);
}

-(IBAction)buttonClick:(id)sender{
    BViewController *b = [[BViewController alloc] init];
    b.delegate = self;  // 将A作为一个变量传给B，这样在B中对delegate的任何操作其实就是对A的操作。
    [self presentViewController:b animated:YES completion:nil];
}

3、B视图定义

#import "UIViewPassValueDelegate.h"

NSObject<UIViewPassValueDelegate> *delegate;
@property (nonatomic,retain) NSObject<UIViewPassValueDelegate> *delegate;
- (IBAction)buttonClick:(id)sender;

 7 @synthesize delegate;
 8 -(IBAction)buttonClick:(id)sender{
 9     [delegate passValue:@"ddd"];
    NSLog(@"B text = ddd");
    [self dismissViewControllerAnimated:YES completion:nil];
}

这样我点击B视图的按钮时就可以将值传给A视图了。