无法让图像和标题的续集正常工作

Question

在这段代码中，用户在ImageViewController中获取并显示一张照片(现在提供)，添加一个标题，并将照片和标题传递给MTViewcontroller，在那里它被制作成pdf。我已经解决了PDF部分，但与segue斗争。感谢任何指导。我找不到一个这样的例子。

ImageViewController.h

#import <UIKit/UIKit.h>
@interface ImageViewController : UIViewController
{
    NSURL *url;
    UIImage *imageRoll;
}
@property (strong, nonatomic) IBOutlet UIWebView *webView;
@property (strong, nonatomic) IBOutlet UITextField *enterCaption;
- (IBAction)Button:(id)sender;
@end

ImageViewController。我不确定我是否正确处理imageRoll，我找不到合适的segue格式。一旦用户提交了标题，它就会segue到PDF控制器。但是，键盘会释放给segue吗?

- (void)viewDidLoad
{
    [super viewDidLoad];
    // Since iPhone simulator doesn't have photos, load and display a placeholder image
    NSString *fPath = [[NSBundle mainBundle] pathForResource:@"IMG_3997" ofType:@"jpg"];
    url = [NSURL fileURLWithPath:fPath];
    [webView loadRequest:[NSURLRequest requestWithURL:url]];
    UIImage *imageRoll = [UIImage imageWithContentsOfFile:fPath];
}
// User provides a caption for the image
- (IBAction)Button:(id)sender {
    NSString *caption = enterCaption.text;
    [self performSegueWithIdentifier:@"showPDF" sender:sender];
    MTViewController *vc1 = [segue destinationViewController];
    vc1.photoCaption = caption;
    MTViewController *vc2 = [segue destinationViewController];
    vc2.photoImage = imageRoll;
}
//Dismiss Keyboard
- (BOOL)textFieldShouldReturn:(UITextField *)textField
{
    [textField resignFirstResponder];
    return YES;
}

MTViewController.h

#import <UIKit/UIKit.h>
#import "ReaderViewController.h"
@interface MTViewController : UIViewController <ReaderViewControllerDelegate>
@property(nonatomic, assign) NSString *photoCaption;
@property(nonatomic, assign) UIImage *photoImage;
- (IBAction)didClickMakePDF:(id)sender;
@end

MTViewController。我是否通过并正确使用photoCaption和photoImage ?

- (IBAction)didClickMakePDF {
    [self setupPDFDocumentNamed:@"NewPDF" Width:850 Height:1100];
    [self beginPDFPage];
    CGRect textRect = [self addText:photoCaption
                          withFrame:CGRectMake(kPadding, kPadding, 400, 200) fontSize:48.0f];
    CGRect blueLineRect = [self addLineWithFrame:CGRectMake(kPadding, textRect.origin.y + textRect.size.height + kPadding, _pageSize.width - kPadding*2, 4) 
                                       withColor:[UIColor blueColor]];
    UIImage *anImage = [UIImage imageNamed:@"photoImage"];
    CGRect imageRect = [self addImage:anImage 
                              atPoint:CGPointMake((_pageSize.width/2)-(anImage.size.width/2), blueLineRect.origin.y + blueLineRect.size.height + kPadding)];
    [self addLineWithFrame:CGRectMake(kPadding, imageRect.origin.y + imageRect.size.height + kPadding, _pageSize.width - kPadding*2, 4) 
                 withColor:[UIColor redColor]];
    [self finishPDF];
}

Answer 1

updated:

您应该使用self.xxx = xxx在一种方法中保存它，并使用self.xxx在另一种方法中获得它。例如，您应该使用

self.imageRoll = [UIImage imageWithContentsOfFile:fPath];

而不是在代码中声明新的imageRoll。你的标题也是一样的。

你使用segue的方式不正确。

您调用[self performSegueWithIdentifier:@"showPDF" sender:sender];的方式是正确的。然后你可以在

中做一些自定义

- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender
{
    if ([segue.identifier isEqualToString:@"showPDF"]) {
        MTViewController *vc1 = [segue destinationViewController];
        vc1.photoCaption = self.caption;
        vc1.photoImage = self.imageRoll;
    }
}