【发布时间】：2013-06-18 06:16:30
【问题描述】：
我使用 Xcode 4.6.1、iOS SDK 6.1、ARC 和 Storyboards，测试运行 6.1.3 的设备 iphone 4S
我在配置包含图片的 collectionviewcell 时遇到了一点问题，当我尝试在单元格上添加一些自定义图片时，内存只是每张图片直接跳跃 30-40mb，图片直接在设备相机并保存在文档目录中，也许您可以帮助我。
这是我使用的代码：
--the code to load the images path on an array imagesArray
-(void) llenarArregloImagenes
{
imagesArray=[[NSMutableArray alloc]init];
NSFileManager *fileMgr=[[NSFileManager alloc]init];
NSError * error = nil;
NSString *documentsDirectory = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) lastObject];
//vemos cuantos objetos con la extension .jpg hay
NSArray *contenidoDirectorio=[fileMgr contentsOfDirectoryAtPath:documentsDirectory error:&error];
//FILTER THE JPG FILES
contenidoDirectorio = [contenidoDirectorio filteredArrayUsingPredicate:[NSPredicate predicateWithFormat:@"pathExtension ==[c] %@", @"jpg"]];
//para meter en el arrelo las imagenes
int indice=0;
if([contenidoDirectorio count]>0)
{
for(indice=0;indice<=[contenidoDirectorio count]-1;indice++)
{
NSString* path = [documentsDirectory stringByAppendingPathComponent: [NSString stringWithString:[contenidoDirectorio objectAtIndex:indice]]];
[imagesArray addObject:path];
}
}
--end loading images
然后我使用此代码将图像加载到集合视图中
--collection view code to add image to cell
-(UICollectionViewCell *)collectionView:(UICollectionView *)collectionView
cellForItemAtIndexPath:(NSIndexPath *)indexPath
{
NSLog(@"Entra a las celdas");
static NSString *identificador=@"celdaImagen";
celdaImagen *myCell = [collectionView dequeueReusableCellWithReuseIdentifier:identificador forIndexPath:indexPath];
UIImage* image = [UIImage imageWithContentsOfFile:[imagesArray objectAtIndex:indexPath.item]];
//myCell.imagen.image = [imagesArray objectAtIndex:indexPath.item];
//comprimir la imagen
//double compressionRatio=1;
//NSData *imgData=UIImageJPEGRepresentation(image,compressionRatio);
//NSLog(@"tamano de la imagen %i",(imgData.length)/1024);
//UIImage *imagenRedimensionada=[[UIImage alloc] initWithData:imgData];
//
NSData *imageData = UIImagePNGRepresentation(image); //png o jpg
NSLog(@"tamano imagen %i",(imageData.length)/1024);
myCell.imagen.image=image;
return myCell;
}
--end of loading images
这是我用来从相机或相机胶卷中保存图像的代码，我必须说我不在乎它是 PNG 还是 JPG，我可以使用任何一个。
--code to save image on documents file
-(void)imagePickerController:(UIImagePickerController *)picker
didFinishPickingMediaWithInfo:(NSDictionary *)info
{
NSString *mediaType = info[UIImagePickerControllerMediaType];
[self dismissViewControllerAnimated:YES completion:nil];
if ([mediaType isEqualToString:(NSString *)kUTTypeImage]) {
UIImage *image = info[UIImagePickerControllerOriginalImage];
NSData *imageData = UIImageJPEGRepresentation(image,0.009); //png o jpg
NSLog(@"tamano imagen %i",(imageData.length)/1024);
NSFileManager *fileMgr=[[NSFileManager alloc]init];
NSError * error = nil;
NSString *documentsDirectory = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) lastObject];
//vemos cuantos objetos con la extension .png hay
NSArray *contenidoDirectorio=[fileMgr contentsOfDirectoryAtPath:documentsDirectory error:&error];
//contenidoDirectorio = [contenidoDirectorio filteredArrayUsingPredicate:[NSPredicate predicateWithFormat:@"pathExtension ==[c] %@", @"mov"]];
NSString *nombreArchivo=[NSString stringWithFormat:@"imagen%i.jpg",[contenidoDirectorio count]] ;
NSString *path = [documentsDirectory stringByAppendingPathComponent:nombreArchivo];
//mostramos el contenido del archivo
NSLog(@"Documents directory: %@", [fileMgr contentsOfDirectoryAtPath:documentsDirectory error:&error]);
//guardamos el archivo
[imageData writeToFile:path options:NSDataWritingAtomic error:&error];
//volvemos a cargar los datos del collectionview
[self llenarArregloImagenes];
//metemos la ruta completa de la imagen
//double compressionRatio=0.1;
//NSData *imgData=UIImageJPEGRepresentation(image,compressionRatio);
//UIImage *imagenRedimensionada=[[UIImage alloc] initWithData:imgData];
//
//[imagesArray addObject:imagenRedimensionada];
[self.collectionView reloadData];
if (error != nil)
{
NSLog(@"Error: %@", error);
return;
}
}
else if ([mediaType isEqualToString:(NSString *)kUTTypeMovie])
{
// Code here to support video if enabled
}
}
--end of code to save image
像相机胶卷这样的应用程序的最佳方法是什么，我可以看到超过 6 张图像？也许我将它们保存错误或将错误添加到集合视图中？谢谢。
【问题讨论】：
标签： memory uiimage uicollectionviewcell