iOS中详解Block作为property属性实现页面之间传值

- (void)SecondVc{ 
 
  SecondViewController *svc = [[SecondViewController alloc] init]; 
  // Block 传值 
  svc.secOndBlock= ^(){ 
    NSLog(@"First->Second"); 
    [self.button setTitle:@"23" forState:UIControlStateNormal]; 
  }; 
  [self.navigationController pushViewController:svc animated:YES]; 
   
} 

typedef void (^SecondController)(); 
@interface SecondViewController : UIViewController 
/** block */ 
@property (nonatomic, copy) SecondController secondBlock; 
@end

- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event{ 
  NSLog(@"second view controller"); 
  if (_secondBlock) { 
    _secondBlock(); 
  } 
}