CODEWITHSUNDEEP
iphoneuiimage
nbojja
nbojja

Reputation: 1655

Save Image to sandbox from UIImage in iPhone

I am showing very big size images in UITableView, because of this my app is getting crashed after some time. Now i want to resize the image and save it to disk. can some one help me resizing the image from NSData/UIImage and saving saving it to the disk.

I got the code to resize the image from UIImage, so as the result i have my resized in image in UIImage object, how to save it to iphone sandbox.

Thanks,

Upvotes: 12

Views: 17181

Answers (3)

Praxiteles
Praxiteles

Reputation: 6020

Here is code to save to the Documents directory on iOS that is from working code.

// Convert UIImage to JPEG
NSData *imgData = UIImageJPEGRepresentation(image, 1); // 1 is compression quality

// Identify the home directory and file name    
NSString  *jpgPath = [NSHomeDirectory() stringByAppendingPathComponent:@"Documents/Test.jpg"]; 

// Write the file.  Choose YES atomically to enforce an all or none write. Use the NO flag if partially written files are okay which can occur in cases of corruption
[imgData writeToFile:jpgPath atomically:YES];

Upvotes: 30

Rajat
Rajat

Reputation: 1388

NSData *imgData = UIImageJPEGRepresentation(image, 1);

CGImageSourceRef source = CGImageSourceCreateWithData((CFMutableDataRef)imgData, NULL);
NSDictionary *metadata = [(NSDictionary *) CGImageSourceCopyPropertiesAtIndex(source,0,NULL)autorelease];
NSString  *jpgPath = [NSHomeDirectory() stringByAppendingPathComponent:@"Documents/Test.jpg"];
[imageMutableData writeToFile:jpgPath atomically:YES];

It will copy your image to documents folder in sandbox with name Test.jpg.

If you want to do it for PNG you can try UIImagePNGRepresentation(image);

Upvotes: 1

Andrew Pouliot
Andrew Pouliot

Reputation: 5421

You're asking 'how do I write a file' right?

I guess there is a touch of complication in that you probably want to write into the Library/Caches directory, so when the phone gets backed up you don't save those files.

Get the root of the app folder w/ NSHomeDirectory() and then append Library/Caches.

You can write an NSData to the fs w/ a method on NSData. If you have a UIImage, you can do UIImageJPEGRepresentation() or UIImagePNGRepresentation to get data.

Upvotes: 4

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