iOS 图片存到沙盒

- (void)viewDidLoad {

    [superviewDidLoad];

    //初始化一个加载图片的试图

    imageview=[[UIImageViewalloc]initWithFrame:CGRectMake(0,50, self.view.frame.size.width,self.view.frame.size.height-100)];

    [self.viewaddSubview:imageview];

    

    //多线程

    dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT,0), ^{

        NSURL * url = [NSURLURLWithString:kURL];

        NSData * data = [[NSDataalloc]initWithContentsOfURL:url];

        image = [[UIImagealloc]initWithData:data];

        if (data !=nil) {

            dispatch_async(dispatch_get_main_queue(), ^{

                imageview.image =image;

                NSFileManager *fileManager = [NSFileManagerdefaultManager];

                NSArray *paths =NSSearchPathForDirectoriesInDomains(NSDocumentDirectory,NSUserDomainMask,YES);

                NSString *documentsDirectory = [pathsobjectAtIndex:0];

                 NSString *myDirectory = [documentsDirectorystringByAppendingPathComponent:@"test"];

                NSString *filePath = [myDirectorystringByAppendingPathComponent:[NSStringstringWithFormat:@"pic_%@.png",image]];

                NSLog(@"documentsDirectory%@",filePath);

                 [UIImagePNGRepresentation(image)writeToFile:filePath atomically:YES];

                [fileManager createDirectoryAtPath:myDirectorywithIntermediateDirectories:YESattributes:nilerror:nil];

//                NSData *data=[[NSData alloc]init];

//                data=[NSKeyedArchiver archivedDataWithRootObject:filePath];

//                [data writeToFile:myDirectory atomically:YES];

                [selfthepictures];

            });

        }  

    });

    

}

//取出沙盒的图片

-(void)thepictures

{

    NSArray *paths =NSSearchPathForDirectoriesInDomains(NSDocumentDirectory,NSUserDomainMask, YES);

    NSString *documentsDirectory = [pathsobjectAtIndex:0];

    NSLog(@"documentsDirectory%@",documentsDirectory);

    NSFileManager *fileManage = [NSFileManagerdefaultManager];

    NSString *myDirectory = [documentsDirectorystringByAppendingPathComponent:@"test"];

    NSArray *file = [fileManagesubpathsOfDirectoryAtPath: myDirectoryerror:nil];

    NSLog(@"%@",file);

    NSArray *files = [fileManagesubpathsAtPath: myDirectory ];

    NSLog(@"%@",files);

}

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