CODEWITHSUNDEEP
iosuiimage
drekka
drekka

Reputation: 21883

imageWithcontentsOfFile failing to load saved image from simulator cache dir

I'm writing an image to the simulators cache directory using 

NSURL *cacheDir = [[NSFileManager defaultManager] URLsForDirectory:NSCachesDirectory 
                                                         inDomains:NSUserDomainMask].lastObject;
NSURL *avatarFileURL = [cacheDir URLByAppendingPathComponent:@"test.png" isDirectory:NO];
NSData *imageData = UIImagePNGRepresentation(avatarImage);
[imageData writeToURL:avatarFileURL atomically:YES];

This works fine and I've verified the image by logging the avatarFile url and loading it into a browser, which displays the cache image.

I then try and read the test image back and I'm getting different results if I use imageWithContentsOfFile: and imageWithData: as follows:

NSURL *cacheDir = [[NSFileManager defaultManager] URLsForDirectory:NSCachesDirectory 
                                                         inDomains:NSUserDomainMask].lastObject;
NSURL *avatarFileURL = [cacheDir URLByAppendingPathComponent:@"test.png" isDirectory:NO];
// Returns a nil.
NSString *avatarFile = avatarFileUrl.absoluteString;
UIImage *image1 = [UIImage imageWithContentsOfFile:avatarFile]; 

// Returns the image.
NSData *imageData = [NSData dataWithContentsOfURL:avatarFileUrl];
UIImage *image2 = [UIImage imageWithData:imageData];

I'm at a loss to explain why imageWithContentsOfFile fails and imageWithData works when they are both addressing the same URL. I've verified the URL by logging it and urls are exactly the same.

Anyone know why imageWithContentsOfFile is not working?

Upvotes: 0

Views: 173

Answers (1)

rmaddy
rmaddy

Reputation: 318774

Your issue is with this line:

NSString *avatarFile = avatarFileUrl.absoluteString;

Look at the value of avatarFile. It will be something like file:///..... imageWithContentsOfFile: expects a proper file path, not a file URL.

You need to properly convert the file URL into a path. That is done as follows:

NSString *avatarFile = avatarFileUrl.path;

Upvotes: 1

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