ios - 将 UIImage 从一个 Viewcontroller 传递到另一个 Viewcontroller 得到 nil

Question

我正在尝试将 UIImage 从一个 Viewcontroller 传递到另一个 Viewcontroller，方法与我传递 NSString 的方式相同，但在图像的情况下，它在第二个 Controller 中获得 nil 值。我使用 imagepickercontroller 从第一个 Controller 中的图库中选择图像。 这是 InfoViewcontroller.h-

#import <UIKit/UIKit.h>

@interface InfoViewController : UIViewController

@property(strong,nonatomic) UIImagePickerController *imagepicker;
@property(strong,nonatomic) UIImage *image1;

@end

这是InfoViewcontroller.m-

- (void)imagePickerController:(UIImagePickerController *)picker  didFinishPickingMediaWithInfo:(NSDictionary *)info{

NSData *data=UIImageJPEGRepresentation([info objectForKey:@"UIImagePickerControllerOriginalImage"], 1);
image1=[[UIImage alloc]initWithData:data];
//[imgview1 setImage:image1];
[imagepicker dismissViewControllerAnimated:YES completion:nil];
[self performSegueWithIdentifier:@"tocrop" sender:self];
}

-(void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender{

if ([segue.identifier isEqualToString:@"toimage"]) {

ThirdViewController *destViewController = segue.destinationViewController;
destViewController.image2 =image1;}
}

这是ThirdViewController.h-

#import <UIKit/UIKit.h>

@interface ThirdViewController : UIViewController
@property (strong, nonatomic)  IBOutlet UIImageView *imgview2;
@property (strong,nonatomic) UIImage *image2;
@end

这是ThirdViewController.m-

-(void)viewDidLoad {
[super viewDidLoad];
//if(image2==nil) NSLog(@"abab");
[imgview2 setImage:image2];
}

为什么我得到的是零？

Answer 1

在这里

- (void)imagePickerController:(UIImagePickerController *)picker  didFinishPickingMediaWithInfo:(NSDictionary *)info{

NSData *data=UIImageJPEGRepresentation([info objectForKey:@"UIImagePickerControllerOriginalImage"], 1);
image1=[[UIImage alloc]initWithData:data];
//[imgview1 setImage:image1];
[imagepicker dismissViewControllerAnimated:YES completion:nil];
[self performSegueWithIdentifier:@"tocrop" sender:self];
}

你正在使用“ToCrop”执行 segue，在这里你检查 toimage

if ([segue.identifier isEqualToString:@"toimage"]) 

我认为应该是 if ([segue.identifier isEqualToString:@"tocrop"]) 并且还使用 self.image1=[[UIImage alloc]initWithData:data];