Question

我有这个简单的课程

TestViewController.h

#import <UIKit/UIKit.h>
#import "ClassB.h"

@protocol TestViewControllerDelegate <NSObject>

-(void)hello;

@end

@interface TestViewController : UIViewController

@property (nonatomic , weak) id<TestViewControllerDelegate> delegate;

@end

TestViewController.m

#import "TestViewController.h"

@interface TestViewController ()

@end

@implementation TestViewController
@synthesize delegate = _delegate;

- (void)viewDidLoad
{
    [super viewDidLoad];

    /******* WHAT SHOULD I WRITE HERE?!?? *****/

    [self.delegate hello];

}

- (void)didReceiveMemoryWarning
{
    [super didReceiveMemoryWarning];
}

@end

另一堂课：

ClassB.h

#import <Foundation/Foundation.h>
#import "TestViewController.h"

@interface ClassB : NSObject <TestViewControllerDelegate>

@end

ClassB.m

#import "ClassB.h"
@implementation ClassB

-(void)hello
{
    NSLog(@"HELLO!");
}

@end

现在我需要创建和实例化ClassB并将此实例设置为TestViewContoller的委托，但我无法弄清楚我需要编写什么！你能帮帮我吗？

Answer 1

你所写的内容是正确的。您需要做的唯一事情是将ClassB设置为TestViewController的委托。通常做的一种方法是让ClassB实例化TestViewController，然后将自己设置为委托：

在ClassB中：

TestViewController *test = [[TestViewController alloc] init];
test.delegate = self;

如何设置委托

1 个答案: