Question

我正在开发一个类似的应用程序，从相机拍摄照片并将它们保存在字典数组和单例类中的nsdocument目录路径中。我在与每个单元格对应的集合视图中显示已保存的图片。我试过了，但我得到的是，集合视图图像在每个单元格中显示相同的图像。

示例数组计数为2，对于2个单元格显示最新图片，即第二张图片。所以请帮助我。代码如下所示......

CameraVC Class

//拍照时

-(IBAction)takephoto:(id)sender
{
tapCount += 1;
AVCaptureConnection *videoConnection  = nil;
for(AVCaptureConnection *connection in StillImageOutput.connections)
{
    for(AVCaptureInputPort *port in  [connection inputPorts])
    {
        if ([[port mediaType] isEqual:AVMediaTypeVideo]){
            videoConnection =connection;
            break;
        }}}

  [StillImageOutput captureStillImageAsynchronouslyFromConnection:videoConnection completionHandler:^(CMSampleBufferRef imageDataSampleBuffer, NSError *error){

    if (imageDataSampleBuffer!=NULL) {
      NSData *imageData =[AVCaptureStillImageOutput jpegStillImageNSDataRepresentation:imageDataSampleBuffer];

       self.image = [ UIImage imageWithData:imageData];
        int x = arc4random() % 100;
        NSTimeInterval secondsSinceUnixEpoch = [[NSDate date]timeIntervalSince1970];

      ImageName = [NSString stringWithFormat:@"%@_%d_%d",self.siteName,x,(int)secondsSinceUnixEpoch];

      [[SingletonImage singletonImage]SaveImageInNSdocumentAndCache:self.image withImageName:ImageName];
     [self.collection_View reloadData];
 }
   }];}

我的收藏查看方法

-(NSInteger)collectionView:(UICollectionView *)collectionView numberOfItemsInSection:(NSInteger)section
{
return [[[SingletonImage singletonImage]arrayDict] count];}

-(UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath
{

CollectionViewCell *Cell = [collectionView dequeueReusableCellWithReuseIdentifier:@"Cell" forIndexPath:indexPath];

//Loading images in collection view cell
Cell.image_View.image = [[SingletonImage singletonImage]ProvideImage:ImageName];

 return Cell;

  }

这是我的单身人士课程

 #import "SingletonImage.h"
@implementation SingletonImage
- (id)init
{
self = [super init];
if ( self )
{
    self.arrayDict = [[NSMutableArray alloc] init];
   self.imageDict = [[NSMutableDictionary alloc]init];
  }
return self;}

+(instancetype)singletonImage
{
static SingletonImage *singletonImage;
static dispatch_once_t onceToken;
dispatch_once(&onceToken, ^{
    singletonImage = [[SingletonImage alloc]init];
    });
return singletonImage;}

//将图像保存到字典数组和nsdocument目录路径

 -(void)SaveImageInNSdocumentAndCache:(UIImage *)image  withImageName:(NSString *)str
 {
//Saving image in array of dictionaries
[self.imageDict setObject:image forKey:str];
  [self.arrayDict insertObject:self.imageDict atIndex:0];
NSLog(@" array of dictionaries%@",self.arrayDict);
//Saving image in nsdocumnet directory path
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentDirectory = paths.firstObject;
NSData *imageData = UIImagePNGRepresentation(image);
NSString *imageFolder = @"Photos";
NSDateFormatter *dateFormat = [[NSDateFormatter alloc]init];
[dateFormat setDateFormat:@"yyyMMddHHmmss"];
   NSString *imagePath = [NSString stringWithFormat:@"%@/%@",documentDirectory,imageFolder];

BOOL isDir;
NSFileManager *fileManager= [NSFileManager defaultManager];
if(![fileManager fileExistsAtPath:imagePath isDirectory:&isDir])
    if(![fileManager createDirectoryAtPath:imagePath withIntermediateDirectories:YES attributes:nil error:NULL])
        NSLog(@"Error: folder creation failed %@", documentDirectory);

[[NSFileManager defaultManager] createFileAtPath:[NSString stringWithFormat:@"%@/%@", imagePath, str] contents:nil attributes:nil];
[imageData writeToFile:[NSString stringWithFormat:@"%@/%@", imagePath, str] atomically:YES];}

//提供图像（如果它在字典中，或者从nsdocument目录路径提供

）

   - (UIImage *)ProvideImage:(NSString *)text {

UIImage *Savedimage;

    NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
    NSString *documentsDirectory = [paths objectAtIndex:0];
    NSString *filePath = [documentsDirectory stringByAppendingPathComponent:text];
   if ([self.imageDict objectForKey:text])
   {
   Savedimage = [self.imageDict objectForKey:text];
    }
  else if([[NSFileManager defaultManager]fileExistsAtPath:filePath])
  {

    Savedimage = [UIImage imageWithContentsOfFile:filePath];

    NSLog(@"%@",Savedimage);

        NSLog(@"File exists at the path");  }
    else
      {
        NSLog(@"Image doesnot exist");
      }


NSLog(@" the saved image is :%@",Savedimage);
 return Savedimage;}

VC.h文件这里我声明了nsstring

   @interface CameraViewController : UIViewController<UICollectionViewDataSource ,UICollectionViewDelegate,UIImagePickerControllerDelegate>
 {   NSString *ImageName;

  }

和ImageName在单元格中用于索引路径方法的项目，以从singleton类获取图像。我尝试过我所知道的。

NSDocument Directory＆amp;加载图片集合视图

0 个答案: