使用相机胶卷图像设置背景答案

【问题标题】：Set Background using camera roll images使用相机胶卷图像设置背景
【发布时间】：2011-06-06 21:45:31
【问题描述】：

我想知道，如何使用相机胶卷图像更改我的图像应用背景。有任何想法吗？？？如何获得相机滚动路径或类似的东西！！！

谢谢！！！！

【问题讨论】：

标签： objective-c ios

【解决方案1】：

以下代码使用工具栏上的按钮，按下时会调出相机胶卷，然后您就可以选择要设置的图像

首先添加 MobileCoreServices 框架

在.h文件中添加以下代码

    #import <UIKit/UIKit.h>
#import <MobileCoreServices/MobileCoreServices.h>

@interface cameraViewController : UIViewController
<UIImagePickerControllerDelegate,
UINavigationControllerDelegate, UIPopoverControllerDelegate>

@property (nonatomic) BOOL newMedia;
@property (nonatomic, strong) IBOutlet UIImageView *imageView;
@property (nonatomic, strong) UIPopoverController *popoverController;
@property (nonatomic, strong) IBOutlet UIToolbar *toolbar;

- (IBAction)useCameraRoll: (id)sender;
@end

在.m文件中添加如下代码：

@synthesize imageView, popoverController, toolbar, newMedia;

    - (IBAction) useCameraRoll: (id)sender
{
    if ([self.popoverController isPopoverVisible]) {
        [self.popoverController dismissPopoverAnimated:YES];
    } else {
        if ([UIImagePickerController isSourceTypeAvailable:
             UIImagePickerControllerSourceTypeSavedPhotosAlbum])
        {
            UIImagePickerController *imagePicker =
            [[UIImagePickerController alloc] init];
            imagePicker.delegate = self;
            imagePicker.sourceType =
            UIImagePickerControllerSourceTypePhotoLibrary;
            imagePicker.mediaTypes = [NSArray arrayWithObjects:
                                  (NSString *) kUTTypeImage,
                                  nil];
            imagePicker.allowsEditing = NO;

            self.popoverController = [[UIPopoverController alloc]
                initWithContentViewController:imagePicker];

            self.popoverController.delegate = self;

            [self.popoverController 
                presentPopoverFromBarButtonItem:sender
                permittedArrowDirections:UIPopoverArrowDirectionUp
                animated:YES];

             newMedia = NO;
        }
    }
}



#pragma mark -
#pragma mark UIImagePickerControllerDelegate

-(void)imagePickerController:(UIImagePickerController *)picker
didFinishPickingMediaWithInfo:(NSDictionary *)info
{
    [self.popoverController dismissPopoverAnimated:true];
    NSString *mediaType = [info
           objectForKey:UIImagePickerControllerMediaType];
    [self dismissModalViewControllerAnimated:YES];
    if ([mediaType isEqualToString:(NSString *)kUTTypeImage]) {
        UIImage *image = [info
            objectForKey:UIImagePickerControllerOriginalImage];

        self.imageView.image = image;
        if (newMedia)
            UIImageWriteToSavedPhotosAlbum(image,
               self,  
               @selector(image:finishedSavingWithError:contextInfo:),
               nil);
    }
    else if ([mediaType isEqualToString:(NSString *)kUTTypeMovie])
    {
                // Code here to support video if enabled
        }
}

-(void)image:(UIImage *)image
finishedSavingWithError:(NSError *)error
 contextInfo:(void *)contextInfo
{
    if (error) {
        UIAlertView *alert = [[UIAlertView alloc]
           initWithTitle: @"Save failed"
           message: @"Failed to save image"
           delegate: nil
           cancelButtonTitle:@"OK"
           otherButtonTitles:nil];
        [alert show];
    }
}


-(void)imagePickerControllerDidCancel:(UIImagePickerController *)picker
{
   [self dismissModalViewControllerAnimated:YES];
}

在 viewDidUnload 中添加以下内容：

- (void)viewDidUnload {
    self.imageView = nil;
    self.popoverController = nil;
    self.toolbar = nil;
}

不要忘记将 imageview 连接到您的图像，并将 cameraroll 按钮连接到您的按钮。

【讨论】：

【解决方案2】：

查看资产库的文档。

【讨论】：

【解决方案3】：

-(void) uourCallingMethod{ UIImage *img = [UIImage imageNamed: [NSString stringWithFormat:@"image.jpg", i]]; UIImageWriteToSavedPhotosAlbum(img, nil, nil, nil); }

(void) image:(UIImage *)image didFinishSavingWithError:(NSError *) error contextInfo:(void *) contextInfo{

}

【讨论】：