UIColor 实例默认是不支持 copy 操作的, 但有时候我们还是需要这样的操作, 怎么实现呢?
// @implementation UIImage (Copying)
+ (UIImage *)decode:(UIImage *)image {
if (image == nil) {
return nil;
}
UIGraphicsBeginImageContextWithOptions(image.size, NO, image.scale);
[image drawAtPoint:CGPointZero];
UIImage *result = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
return result;
}
- (instancetype)copy {
return [UIImage decode:self];
}
