ios - 从 imagePickerController 将图像保存到文件 - 无法加载图像

Question

我不太确定这里出了什么问题，我非常感谢您的帮助，因为我很困惑。这是我的 imagePickerController

-(void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info {
        [[NSUserDefaults standardUserDefaults] setObject:[NSNumber numberWithLong:customphoto1] forKey:@"customphoto1count"];
        UIImage *button1Image = [info objectForKey:@"UIImagePickerControllerOriginalImage"];


    pngData = UIImagePNGRepresentation(button1Image);
    NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
    NSString *documentsPath = [paths objectAtIndex:0]; //Get the docs directory
    NSString *filePath = [documentsPath stringByAppendingPathComponent:@"Button1image.png"]; //Add the file name
    [pngData writeToFile:filePath atomically:YES]; //Write the file
    [self dismissViewControllerAnimated:YES completion:NULL];
    pngData = [NSData dataWithContentsOfFile:filePath];
    UIImage *imageLoaded = [UIImage imageWithData:pngData];
    [_button1 setImage:imageLoaded forState:UIControlStateNormal];
    self.button1.clipsToBounds = YES;
    self.button1.layer.cornerRadius = (self.button1.frame.size.width / 16);//half of the width
    self.button1.layer.borderColor=[UIColor blackColor].CGColor;
    self.button1.layer.borderWidth=1.0f;
    [self dismissViewControllerAnimated:YES completion:NULL];
}

上面保存了图像(据我所知)，因为 _button1 正在从 imageLoaded 读取

当应用程序关闭并重新打开时，这就是调用要显示的按钮的内容，应该从我的 NSData 加载图片:

-(void)customButton1{
    if (customphoto1 == 1) {
        NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
        NSString *documentsPath = [paths objectAtIndex:0]; //Get the docs directory
        NSString *filePath = [documentsPath stringByAppendingPathComponent:@"Button1image.png"]; //Add the file name
        [pngData writeToFile:filePath atomically:YES];
        pngData = [NSData dataWithContentsOfFile:filePath];
        UIImage *imageLoaded1 = [UIImage imageWithData:pngData];
        NSLog(@"%@", filePath);
//        UIImage *imageload1 = [UIImage imageWithData:[newManagedObject valueForKey:@"imagesone"]];
        [_button1 setImage:imageLoaded1 forState:UIControlStateNormal];

    }
    else {
        button1ImageName = @"addnew";
    }
}

为什么我的图片没有加载？非常感谢

Answer 1

试试这个:

-(void)customButton1{
    if (customphoto1 == 1) {
        NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
        NSString *documentsPath = [paths objectAtIndex:0]; //Get the docs directory
        NSString *filePath = [documentsPath stringByAppendingPathComponent:@"Button1image.png"]; 
        UIImage *imageLoaded1 = [UIImage imagewithcontentsoffile:filePath];
        NSLog(@"%@", filePath);

        [_button1 setImage:imageLoaded1 forState:UIControlStateNormal];

    }
    else {
        button1ImageName = @"addnew";
    }
}

调试:检查打印的文件路径是否正确。在 Finder > CMD + Shift + G 中打开此路径并粘贴该路径(从路径中删除文件名，直到文件夹级别为止)。然后检查该文件夹中是否存在该特定图像。

同样在您的 didFinishPickingMediaWithInfo 方法中，您调用了 dismissViewControllerAnimated 方法两次，它应该是一次并且在方法的末尾。

希望对你有帮助