传值方

.h文件
#import <UIKit/UIKit.h>

@class AddPushCourseSearchModel;

//自定义类型
typedef void(^SelectedDiseaseBlock)(AddPushCourseSearchModel *searchModel);

@interface AddPushCourseSearchViewController : UIViewController

//声明自定义类型
@property (nonatomic, copy) SelectedDiseaseBlock selectedDiseaseBlock;

- (void)returnDisease:(SelectedDiseaseBlock)block;

@end


.m文件
- (void)returnDisease:(SelectedDiseaseBlock)block{
    self.selectedDiseaseBlock = block;
}

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
    //点击Cell 添加回调函数，传model
    AddPushCourseSearchModel *model = _courseList[indexPath.row];
    if (self.selectedDiseaseBlock) {
        self.selectedDiseaseBlock(model);
        [self backAction];
    }
}

接收方

- (void)nurseAddIllnessEvent{
    AddPushCourseSearchViewController *VC = [[AddPushCourseSearchViewController alloc] init];
    [self.navigationController pushViewController:VC animated:YES];
    [VC returnDisease:^(AddPushCourseSearchModel *searchModel) {
        #warning 拿到model，刷新界面
    }];
}

其实可以不在.h文件暴露方法

传值方

.h文件
#import <UIKit/UIKit.h>

@class AddPushCourseSearchModel;

//自定义类型
typedef void(^SelectedDiseaseBlock)(AddPushCourseSearchModel *searchModel);

@interface AddPushCourseSearchViewController : UIViewController

//声明自定义类型
@property (nonatomic, copy) SelectedDiseaseBlock selectedDiseaseBlock;

@end


.m文件
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
   //点击Cell 添加回调函数，传model
   AddPushCourseSearchModel *model = _courseList[indexPath.row];
   if (self.selectedDiseaseBlock) {
       self.selectedDiseaseBlock(model);
       [self backAction];
   }
}

接收方

- (void)nurseAddIllnessEvent{
    AddPushCourseSearchViewController *VC = [[AddPushCourseSearchViewController alloc] init];
    [self.navigationController pushViewController:VC animated:YES];
    
    VC.selectedDiseaseBlock = ^(AddPushCourseSearchModel *searchModel) {
        #warning 拿到model，刷新界面
    };

}

小白总结，欢迎打脸指正