Question

如何通过点击另一个UIIimage内的UIButton来展示UIViewController？我想添加相同的UIButton命令来向SecondViewController添加图像。原谅我的可怜问题。

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:@"VoodooVibe@2x.png"]];
    [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(@"I am in sender");
    [self.navigationController pushViewController:secClass animated:YES];
}

- (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,retain) UIImageView *myImage;
@property(nonatomic,assign) 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:@"VoodooVibe@2x.png"];
    NSLog(@"%@",myImage.image);
    NSLog(@"I am in call transfer");
}

- (void)didReceiveMemoryWarning{

    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

@end

Answer 1

通常应该使用代理，如果您在UIViewController中包含一个类，它将执行某些操作并在特定过程完成时通过委托方法通知您。但在这种情况下，您可以设置UIImage两次。在您的delegate之后，第二次以编程方式设置UIImage。

你不应该做任何事情，比如从外面调用初始化第二个UIImage UIViewController的方法。只需调用viewDidLoad内的所有内容，您就不必关心它，因为UIViewController会自行处理它。

您只需在UIImageView内插入SecondViewController并将其连接到您的头文件即可。然后你可以在m里面访问它。文件。我遇到的问题是我第一次使用jpg而不是png，但更改后缀后一切正常。

<强> ViewController.m

- (IBAction)sendImage:(id)sender {

    SecondViewController *secClass = [[SecondViewController alloc] init];
    [secClass setImageName:@"pic.png"];
    [self.navigationController pushViewController:secClass
                                         animated:YES];

}

<强> SecondViewController.h

@interface SecondViewController : UIViewController

@property (strong, nonatomic)NSString *imageName;
@property (weak, nonatomic) IBOutlet UIImageView *myImage;

@end

SecondViewController.m （只有这两行）

- (void)viewWillAppear:(BOOL)animated{

    [super viewWillAppear:animated];
    [_myImage setImage:[UIImage imageNamed:_imageName]];
}

在SecondViewController中单击按钮时，在ViewController中显示图像

1 个答案: