一個 push action put btn inter text nac mic

1、在第二個視圖控制器的.h文件中定義聲明Block屬性：

// 定義block @property (nonatomic, copy) void (^NextViewControllerBlock)(NSString *tfText); @interface NextViewController () @property (weak, nonatomic) IBOutlet UITextField *inputTF; @end - (IBAction)BtnAction:(id)sender { // 判斷block是否為空 if (self.NextViewControllerBlock) { self.NextViewControllerBlock(self.inputTF.text); } [self.navigationController popViewControllerAnimated:YES]; } 2、在第一個視圖中獲得第二個視圖控制器，並且用第二個視圖控制器來調用定義的屬性： @interface AViewController () @property (weak, nonatomic) IBOutlet UILabel *nextVCInfoLabel; @end - (IBAction)btnClicked:(id)sender { NextViewController*nextVC = [[NextViewController alloc]init]; nextVC.NextViewControllerBlock= ^(NSString *tfText) { self.nextVCInfoLabel.text = tfText; }; [self.navigationController pushViewController:nextVC animated:YES]; }

iOS Block界面反向傳值小demo