经过多次尝试,我没有成功理解错误以及为什么图像没有出现...这是我的代码。
我的协议(protocol).h
#import <Foundation/Foundation.h>
@protocol myProtocol <NSObject>
-(UIImage *)transferImage;
@end
ViewController.h
#import "SecondViewController.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:@"VoodooVibeThumb@2x.png"]];
[view addSubview:_imageView];
NSLog(@"VoodooVibeThumb@2x.png");
}
-(UIImage *)transferImage
{
NSLog(@"VoodooVibeThumb@2x.png");
return _imageView.image;
}
- (IBAction)sendImage:(id)sender
{
SecondViewController *secClass = [[SecondViewController alloc] init];
[secClass setImageName:@"VoodooVibeThumb@2x.png"];
[self.navigationController pushViewController:secClass animated:YES];
}
- (void)didReceiveMemoryWarning
{
[super didReceiveMemoryWarning];
}
@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,retain) UIImage *transferImage;
@property(nonatomic,assign) id delegate;
@property (strong, nonatomic)NSString *imageName;
-(void)callTransfer;
@end
SecondViewController.m
#import "SecondViewController.h"
#import "ViewController.h"
#import "myProtocol.h"
@interface SecondViewController ()
@end
@implementation SecondViewController
@synthesize delegate, myImage, transferImage;
- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
if (self) {
// Custom initialization
}
return self;
}
- (void)viewDidLoad
{
[super viewDidLoad];
}
- (void)viewWillAppear:(BOOL)animated
{
[super viewWillAppear:animated];
[myImage setImage:[UIImage imageNamed:_imageName]];
UIImageView * myImage = [[UIImageView alloc] initWithImage:[UIImage imageNamed:_imageName]];
[secondView addSubview:myImage];
}
-(void)callTransfer
{
myImage.image=[delegate performSelector:@selector(transferImage)];
myImage.image=[UIImage imageNamed:@"VoodooVibeThumb@2x.png"];
NSLog(@"%@",myImage.image);
NSLog(@"I am in call transfer");
}
- (void)didReceiveMemoryWarning
{
[super didReceiveMemoryWarning];
}
@end
最佳答案
在将 myImage subview 添加到 SecondViewController 的 viewDidLoad 方法之前,您似乎没有初始化它。
尝试删除:
[secondView addSubview:myImage];
从 viewDidLoad,并将以下内容添加到 viewWillAppear:
UIImageView * myImage = [[UIImageView alloc] initWithImage:[UIImage imageNamed:_imageName]];
就在之前:
[secondView addSubview:myImage];
可能有更好的方法,但这可能会让您朝着正确的方向前进。
关于ios - 在 FirstViewController 中单击按钮时如何在 SecondViewController 中显示图像,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/19391259/