Compress UIImage
ios, iphone, objective-c, uiimage
Solution
Not quite sure if you want to resize or compress or both.
Below is the code for just compression :
Use JPEG Compression in two simple steps:
1) Convert UIImage to NSData
UIImage *rainyImage =[UImage imageNamed:@"rainy.jpg"];
NSData *imgData= UIImageJPEGRepresentation(rainyImage,0.1 /*compressionQuality*/);
this is lossy compression and image size is reduced.
2) Convert back to UIImage;
UIImage *image=[UIImage imageWithData:imgData];
For scaling you can use answer provided by Matteo Gobbi. But scaling might not be a the best alternative. You would rather prefer to have a thumbnail of the actual image by compression because scaling might make look your image bad on a retina display device.
Problem
I need help resizing a UIImage. For example: I'm displaying a lot images in a UICollection View, but the size of those images is 2 to 4 MB. I need compress or resize those images. I found this: How to compress/resize image on iPhone OS SDK before uploading to a server? but I don't understand how to implement it.