一：利用代理传值，就是利用代理进行通信。
接口文件：
#import <Foundation/Foundation.h>
@protocol Cdelegate <NSObject>
-(void)change:(NSString *)name;
@end
.h文件
@interface ViewController : UIViewController<Cdelegate>
.m文件
- (IBAction)pushBB:(id)sender {
BViewController *bc=[[BViewController alloc]initWithNibName:@"BViewController" bundle:[NSBundle mainBundle]];
bc.delegate=self;
[self presentViewController:bc animated:YES completion:nil];
}
BViewController文件
.h文件
#import "ViewController.h"
#import "Cdelegate.h"
@interface BViewController : ViewController
@property (weak, nonatomic) IBOutlet UITextField *name;
@property(nonatomic,assign)id<Cdelegate> delegate;
@property(nonatomic,copy)ablock block;
- (IBAction)popBB:(id)sender;
@end
.m文件
- (IBAction)popBB:(id)sender {
[self.delegate change:self.name.text];
[self dismissViewControllerAnimated:YES completion:nil];
}
二：block传值
typedef void (^ablock)(NSString *str);
@property(nonatomic,copy)ablock block;
- (IBAction)popBB:(id)sender {
//[self.delegate change:self.name.text];
self.block(self.name.text);
[self dismissViewControllerAnimated:YES completion:nil];
}
- (IBAction)pushBB:(id)sender {
BViewController *bc=[[BViewController alloc]initWithNibName:@"BViewController" bundle:[NSBundle mainBundle]];
bc.block=^(NSString *str){
self.aname.text=str;
};
[self presentViewController:bc animated:YES completion:nil];
}
三：通知
NSDictionary *dic=[NSDictionary dictionaryWithObject:self.name.text forKey:@"name"];
[[NSNotificationCenter defaultCenter]postNotificationName:@"changeText" object:self userInfo:dic];
- (void)viewDidLoad {
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
[[NSNotificationCenter defaultCenter]addObserver:self selector:@selector(changeText:) name:@"changeText" object:nil];
}