UIColor生成UIimage CoreImage blur

gistfile1.m

@interface UIImage (Extension)

+ (UIImage *)imageWithColor:(UIColor *)color andSize:(CGSize)size;
+ (UIImage *)gaussianBlurImage:(UIImage *)image andInputRadius:(CGFloat)radius;
+ (UIImage *)gaussianBlurImageWithColor:(UIColor *)color andSize:(CGSize)size andInputRadius:(CGFloat)radius;

@end

@implementation UIImage (Extension)

+ (UIImage *)imageWithColor:(UIColor *)color andSize:(CGSize)size
{
    CGRect rect = CGRectMake(0, 0, size.width, size.height);
    UIGraphicsBeginImageContextWithOptions(rect.size, NO, 0);
    CGContextRef context = UIGraphicsGetCurrentContext();
    CGContextSetFillColorWithColor(context, color.CGColor);
    CGContextFillRect(context, rect);

    UIImage *img = UIGraphicsGetImageFromCurrentImageContext();

    UIGraphicsEndImageContext();

    return img;
}

+ (UIImage *)gaussianBlurImage:(UIImage *)image andInputRadius:(CGFloat)radius
{
    if (!image) {
        return nil;
    }

    CIContext *context = [CIContext contextWithOptions:nil];
    CIImage *inputImage = [CIImage imageWithCGImage:image.CGImage];

    CIFilter *filter = [CIFilter filterWithName:@"CIGaussianBlur"];
    [filter setValue:inputImage forKey:kCIInputImageKey];
    [filter setValue:[NSNumber numberWithFloat:radius] forKey:@"inputRadius"];
    CIImage *result = [filter valueForKey:kCIOutputImageKey];
    CGImageRef cgImage = [context createCGImage:result fromRect:[inputImage extent]];

    return [UIImage imageWithCGImage:cgImage];
}

+ (UIImage *)gaussianBlurImageWithColor:(UIColor *)color andSize:(CGSize)size andInputRadius:(CGFloat)radius
{
    UIImage *image = [UIImage imageWithColor:color andSize:size];
    if (image) {
        return [UIImage gaussianBlurImage:image andInputRadius:radius];
    }
    else {
        return nil;
    }
}

@end