检查NSDocumentDirectory中的现有图像 [英] Check existing image in NSDocumentDirectory

问题描述

我有一个选择器，将我的图像保存在 NSDocumentDirectory 中，在这里:

I have a picker that saves my image in NSDocumentDirectory, here:

        for (int i = 0; i < image.count; i++) {
            NSLog(@"%@", [image objectAtIndex:i]);
            NSArray *paths = NSSearchPathForDirectoriesInDomains( NSDocumentDirectory,    NSUserDomainMask ,YES );
            NSString *documentsDirec = [paths objectAtIndex:0];
            NSString *savedPath = [documentsDirec stringByAppendingPathComponent:[NSString stringWithFormat:@"myImages%d.png", i]];
            ALAssetRepresentation *rep = [[image objectAtIndex: i] defaultRepresentation];
            UIImage *image = [UIImage imageWithCGImage:[rep fullResolutionImage]];
            NSData *imageData = UIImagePNGRepresentation(image);
            [imageData writeToFile:savedPath atomically:YES];

            NSLog(@"saving at:%@",savedPath);
         }

如何确定或实施检查现有的image/imageName是否已存在.然后，如果存在图像，即使仍在选择器中选择了图像/图像名称，也不会添加相同的图像/图像名称.

How to determine or implement to check if an existing image/imageName is already there. Then if an images exist it will not add the same image/imageName even if its still picked in the picker.

推荐答案

使用以下代码检查文档目录中是否已存在特定图像:

Use the below code for checking a specific image is already exists in the documents directory:

NSString *documentsDirectoryPath = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) objectAtIndex:0];

NSString *imageName = [documentsPath stringByAppendingPathComponent:@"imageName.jpg"];
BOOL fileExists = [[NSFileManager defaultManager] imageName];

在您的代码中，您可以这样添加它:

In your code you can add it like this:

 for (int i = 0; i < image.count; i++) {
                NSLog(@"%@", [image objectAtIndex:i]);
                NSArray *paths = NSSearchPathForDirectoriesInDomains(  NSDocumentDirectory,    NSUserDomainMask ,YES );
                NSString *documentsDirec = [paths objectAtIndex:0];
                NSString *savedPath = [documentsDirec stringByAppendingPathComponent: [NSString stringWithFormat:@"myImages%d.png", i]];

                BOOL fileExists = [[NSFileManager defaultManager] fileExistsAtPath:savedPath];

                //Save only if file not exists
                if(!fileExists) {
                ALAssetRepresentation *rep = [[image objectAtIndex: i] defaultRepresentation];
                UIImage *image = [UIImage imageWithCGImage:[rep fullResolutionImage]];
                NSData *imageData = UIImagePNGRepresentation(image);
                [imageData writeToFile:savedPath atomically:YES];

                NSLog(@"saving at:%@",savedPath);
               }
             }

这篇关于检查NSDocumentDirectory中的现有图像的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！