第二個界面往第一個界面傳值

第二個界面

 

//第二個界面制定協議

@protocol ChuanZhiDelegate

- (void)chuanzhid;

@end

@interface ViewController2 : UIViewController

@property(nonatomic,assign)idchuanzhidelegate;

@end

 

- (void)viewDidLoad {

[super viewDidLoad];

self.view.backgroundColor=[UIColor cyanColor];

self.btn=[[UIButton alloc]initWithFrame:CGRectMake(70, 100, 100, 30)];

self.btn.backgroundColor=[UIColor redColor];

[self.view addSubview:self.btn];

[self.btn addTarget:self action:@selector(chuan) forControlEvents:UIControlEventTouchUpInside];

}

- (void)chuan{

if ([self.chuanzhidelegate respondsToSelector:@selector(chuanzhid)]) {

[self.chuanzhidelegate chuanzhid];

}else{

NSLog(@"代理沒有實現changeStatus:方法");

}

}

然後第一個界面

 

 

- (void)viewDidLoad {

[super viewDidLoad];

self.btn=[[UIButton alloc]initWithFrame:CGRectMake(70, 100, 100, 30)];

self.btn.backgroundColor=[UIColor redColor];

[self.view addSubview:self.btn];

[self.btn addTarget:self action:@selector(chuanzhi) forControlEvents:UIControlEventTouchUpInside];

self.view.backgroundColor=[UIColor lightGrayColor];

}

- (void)chuanzhi{

ViewController2 *vc=[[ViewController2 alloc]init];

vc.chuanzhidelegate=self;//設置為第二個界面的代理

[self.navigationController pushViewController:vc animated:YES];

}

//實現協議

- (void)chuanzhid{

NSLog(@"代理實現");

}