Question

我正在努力让segue正确，但我根本没有得到它。我在游戏编程方面有经验但是在目标c中是初学者。我正在尝试在应用程序中拍照，然后将其显示在另一个视图控制器上，以便用户可以裁剪它这是我的Viewcontroller.h

#import <UIKit/UIKit.h>
#import "CropViewController.h"
@interface ViewController : UIViewController <UIImagePickerControllerDelegate,
UINavigationControllerDelegate> {
UIImagePickerController *picker;
UIImage *image;
IBOutlet UIImageView *imageview;
CropViewController *cropVC;
}
- (IBAction)TakePhoto;

我的Viewcontroller.m是

#import "ViewController.h"
#import "CropViewController.h"

@interface ViewController ()
@end
@implementation ViewController
-(IBAction)TakePhoto {
picker = [[UIImagePickerController alloc]init];
picker.delegate = self;
[picker setSourceType:UIImagePickerControllerSourceTypeCamera];
[self presentViewController:picker animated:YES completion:nil];
[self performSegueWithIdentifier:@"CropImage" sender:self];
}
- (void)imagePickerControllerDidCancel  :(UIImagePickerController *)picker {
[self dismissViewControllerAnimated:YES completion:NULL];
}

- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender
{
if([segue.identifier isEqualToString:@"CropImage"])
{
    CropViewController *CropViewController = segue.destinationViewController;
    CropViewController.theImage = picker;
    // Similar to [segue.destinationViewController setTheImage:yourImage];
}
}
-(void)createDirectory:(NSString *)ShoesDirectory atFilePath:(NSString *)filePath
{
NSString *filePathAndDirectory = [filePath stringByAppendingPathComponent:ShoesDirectory];
NSError *error;

if (![[NSFileManager defaultManager] createDirectoryAtPath:filePathAndDirectory
                               withIntermediateDirectories:NO
                                                attributes:nil
                                                     error:&error])
{
    NSLog(@"Create directory error: %@", error);
}
}

我的CropViewController是

@interface CropViewController : UITableViewController
@property (nonatomic, retain) UIImage *theImage;
@property UIImage *picker;

我希望用户在viewcontroller中按下相机按钮，然后拍照，然后将图片显示到我放置的CopViewController和UImageView。如果我使用上面的代码，那么应用程序会停止我按下“相机”按钮的那一刻更新这是我没有触及App Delagate的崩溃

@autoreleasepool {
return UIApplicationMain(argc, argv, nil, NSStringFromClass([AppDelegate class]));

2013-07-19 14：11：25.226 [4758：907] *因未被捕获而终止应用异常'NSInvalidArgumentException'，原因：'接收者（）没有带标识符的segue 'CropImage'” * 第一次抛出调用堆栈：（0x343192a3 0x3bffd97f 0x3632ce31 0x891ef 0x3620c0c5 0x3620c077 0x3620c055 0x3620b90b 0x3620be01 0x361345f1 0x36121801 0x3612111b 0x37e285a3 0x37e281d3 0x342ee173 0x342ee117 0x342ecf99 0x3425febd 0x3425fd49 0x37e272eb 0x36175301 0x88eed 0x3c434b20）libc ++ abi.dylib：terminate调用抛出异常（LLDB）

Answer 1

取出这一行：

[self presentViewController:picker animated:YES completion:nil];

Answer 2

我不知道它是否使用了segue，但是here就是你想要实现的确切例子。

Answer 3

找到解决方案。您需要在故事板中安装UINavigationController。要执行此操作，请执行第一个场景，单击它并转到xcode顶部的选项卡，然后执行编辑器＆gt;嵌入＆gt;导航控制器，选中按钮将导航控制器设置为初始场景。添加以下代码以隐藏顶部的导航栏。

self.navigationController.navigationBar.hidden = YES;
self.navigationController.navigationBar.translucent = NO;

塞格根本不起作用

3 个答案: