我不明白,因为错误出现“未实现协议中的方法”
myProtocol.h
#import <Foundation/Foundation.h>
@protocol myProtocol <NSObject>
-(UIImage *)transferImage;
@end
ViewController.h
#import "SecondClass.h"
@interface ViewController : UIViewController<myProtocol, UINavigationControllerDelegate>
{
UIView *view;
}
@property (nonatomic,retain) UIImageView *imageView;
- (IBAction)sendImage:(id)sender;
@end
ViewController.m
#import "ViewController.h"
#import "SecondViewController.h"
#import "myProtocol.h"
@interface ViewController ()
@end
@implementation ViewController
- (void)viewDidLoad
{
[super viewDidLoad];
_imageView = [[UIImageView alloc]initWithImage:[UIImage imageNamed:@"[email protected]"]];
[view addSubview:_imageView];
NSLog(@"I am in VC.m");
}
-(UIImage *)transferImage{
NSLog(@"I am in transferImage");
return _imageView.image;}
- (IBAction)sendImage:(id)sender {
SecondViewController *secClass = [[SecondViewController alloc]init];
secClass.delegate = self; [secClass callTransfer]; NSLog(@“我在发件人中”); [self.navigationController pushViewController:secClass动画:是];}
- (void)didReceiveMemoryWarning
{
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
@end
SecondViewController.h
#import <UIKit/UIKit.h>
#import "myProtocol.h"
#import "ViewController.h"
@interface SecondViewController : UIViewController<myProtocol,UINavigationControllerDelegate> {
UIView *secondView;
IBOutlet UIImageView *myImage;
id <myProtocol> myDelegate;
}
@property (nonatomic,strong) UIImageView *myImage;
@property(nonatomic,weak) id delegate;
-(void)callTransfer;
@end
SecondViewController.m
#import "SecondViewController.h"
#import "ViewController.h"
#import "myProtocol.h"
@interface SecondViewController ()
@end
@implementation SecondViewController
@synthesize delegate,myImage;
- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
if (self) {
// Custom initialization
}
return self;
}
- (void)viewDidLoad
{
[super viewDidLoad];
// Do any additional setup after loading the view.
[secondView addSubview:myImage];
}
-(void)callTransfer
{
myImage.image=[delegate performSelector:@selector(transferImage)];
myImage.image=[UIImage imageNamed:@"[email protected]"];
NSLog(@"%@",myImage.image);
NSLog(@"I am in call transfer");
}
- (void)didReceiveMemoryWarning
{
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
@end
就像您在协议实现中声明方法一样简单,但尚未实现相同。在您的Second VC中,您尚未实现方法“ transfer image”。因此,编译器正在生成警告
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