How to compare two UIImage objects
Updated Mark Tickner's solution to Swift 4
import UIKit
extension UIImage {
func isEqualToImage(_ image: UIImage) -> Bool {
let data1 = self.pngData()
let data2 = image.pngData()
return data1 == data2
}
}
The two variables are probably overkill, but they might help explain to someone new to this. Could shorten to:
import UIKit
extension UIImage {
func isEqualToImage(_ image: UIImage) -> Bool {
return self.pngData() == image.pngData()
}
}
One way is to convert them to image data first, and then compare that.
- (BOOL)image:(UIImage *)image1 isEqualTo:(UIImage *)image2
{
NSData *data1 = UIImagePNGRepresentation(image1);
NSData *data2 = UIImagePNGRepresentation(image2);
return [data1 isEqual:data2];
}
A Swift implementation of @Simon's answer:
func image(image1: UIImage, isEqualTo image2: UIImage) -> Bool {
let data1: NSData = UIImagePNGRepresentation(image1)!
let data2: NSData = UIImagePNGRepresentation(image2)!
return data1.isEqual(data2)
}
Or by extending UIImage based on @nhgrif's suggestion:
import UIKit
extension UIImage {
func isEqualToImage(image: UIImage) -> Bool {
let data1: NSData = UIImagePNGRepresentation(self)!
let data2: NSData = UIImagePNGRepresentation(image)!
return data1.isEqual(data2)
}
}