谈谈 iOS 中对图像的模糊处理

在 iOS 实际开发中，我们经常会遇到对图像添加蒙版或模糊处理，为了提高开发效率和方便大家使用，我自己写一个 DYFBlurEffect 类，先来看看效果：

效果图

BlurEffect Preview

DYFBlurEffect用一行代码就完成对图像的模糊处理，并支持系统UIVisualEffectView，使用起来很方便，接下来一起阅读它的使用说明：

使用说明

• Instantiation

// Lazy load
- (DYFBlurEffect *)blurEffect {
    if (!_blurEffect) {
        _blurEffect = [[DYFBlurEffect alloc] init];
    }
    return _blurEffect;
}

• CoreGraphics and vImage

// Uses a `DYFBlurEffectStyle` style.
self.imgView.image = [self.blurEffect blurryImage:image style:DYFBlurEffectLight];

// Tints with a color.
self.imgView.image = [self.blurEffect blurryImage:image tintColor:[UIColor colorWithRed:40/255.0 green:40/255.0 blue:40/255.0 alpha:1]];

/**
Blur out an image with an original image, a blur radius, tint with a color, a saturation delta factor and a mask image.
*/
- (UIImage *)blurryImage:(UIImage *)image blurRadius:(CGFloat)blurRadius tintColor:(UIColor *)tintColor saturationDeltaFactor:(CGFloat)saturationDeltaFactor maskImage:(UIImage *)maskImage;

• UIVisualEffectView(Available iOS 8.0 or later)

UIVisualEffectView *blurView = [self.blurEffect blurViewWithStyle:UIBlurEffectStyleLight];
blurView.frame = self.imgView.bounds;
//blurView.tag = 10;
//blurView.userInteractionEnabled = YES;
[self.view addSubview:blurView];

• CoreImage

 self.imgView.image = [self.blurEffect coreImage:image blurRadius:10];

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Sample Codes

• Sample Codes Gateway

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