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如何UIIimage通过单击UIButton另一个内部来显示一个UIViewController？我想添加相同UIButton的命令以将图像添加到 SecondViewController。原谅我可怜的问题。

我的协议.h

#import <Foundation/Foundation.h>

@protocol myProtocol <NSObject>

-(UIImage *)transferImage;

@end

视图控制器.h

#import "SecondClass.h"

@interface ViewController : UIViewController<myProtocol, UINavigationControllerDelegate>{
    UIView *view;
}

@property (nonatomic,retain) UIImageView *imageView;

- (IBAction)sendImage:(id)sender;

@end

视图控制器.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

第二视图控制器.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
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1 回答 1

0

通常应该使用委托，如果您的内部包含一个类UIViewController，它将执行某些操作并在特定过程完成时使用委托方法通知您。但在这种情况下，您将设置UIImage两次。一次是你delegate的，第二次是通过UIImage编程设置的。

您不应该做任何诸如调用从外部初始化UIImage第二个的方法之类的事情。UIViewController只需调用内部的所有内容viewDidLoad，您不必关心它，因为UIViewController它自己处理它。

您只需UIImageView在您的内部插入一个SecondViewController并将其连接到您的头文件。然后你可以在 m. 文件。我遇到的问题是我第一次使用 ajpg而不是 a png，但是在更改后缀后一切正常。

视图控制器.m

- (IBAction)sendImage:(id)sender {

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

}

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]];
}
于 2013-10-13T09:04:56.547 回答