Question

我想检查一个文件夹。如果我在“路径”中找到“test.jpeg”，如果它是真的我什么都不做，但如果它是假的我必须下载这样的图片

UIImage *image = [[UIImage alloc] initWithData:[NSData dataWithContentsOfURL:[NSURL URLWithString:[dico objectForKey:@"photo"]]]];
nomPhoto = [[cell.pseudo text]stringByReplacingOccurrencesOfString:@"\n" withString:@""];;
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory,NSUserDomainMask,YES);
NSString *document = [paths objectAtIndex:0];
filename = [NSString stringWithFormat:@"%@/%@.jpeg",document,nomPhoto];

NSData *data2 = [NSData dataWithData:UIImageJPEGRepresentation(image, 0.1f)];//1.0f = 100% quality

[data2 writeToFile:filename atomically:YES];

编辑：我试试这个但是不行。路径很好

NSString* documentsPath = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) objectAtIndex:0];
NSString* pict =  [documentsPath stringByAppendingPathComponent :@"portos"]; 


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

if (fileExists)
{
    NSLog(@"file ok");
}else {
    NSLog(@"file ko");
}

THX

Answer 1

已经回答here。

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

Answer 2

如果指定的文件不存在，UIImage的CGImage属性将为nil。

if (image.CGImage) NSLog(@"file ok");
else NSLog(@"file ko");

检查文件是否存在

2 个答案: