效果图：
- (UIView *)containerBackgroundView {
if (!_containerBackgroundView) {
UIToolbar *toolBar = [[UIToolbar alloc] initWithFrame:CGRectZero];
toolBar.barStyle = UIBarStyleBlack;
toolBar.clipsToBounds = YES;
_containerBackgroundView = toolBar;
}
return _containerBackgroundView;
}
也可以使用UIBlurEffect
UIBlurEffect *blurEffect = [UIBlurEffect effectWithStyle:UIBlurEffectStyleLight];
UIVisualEffectView *blurView = [[UIVisualEffectView alloc] initWithEffect:blurEffect];
blurView.frame = myView.bounds;
[myView addSubview:blurView];
UIBlurEffectStyle
UIBlurEffectStyleExtraLight,//额外亮度，（高亮风格）
UIBlurEffectStyleLight,//亮风格
UIBlurEffectStyleDark//暗风格
UIBlurEffect 不能调节模糊半径
如果要调整模糊半径
可以对图片进行高斯模糊
-(UIImage *)convertToBlurImage:(UIImage *)image{
CIFilter *gaussianBlurFilter = [CIFilter filterWithName:@"CIGaussianBlur"];
[gaussianBlurFilter setDefaults];
CIImage *inputImage = [CIImage imageWithCGImage:[image CGImage]];
[gaussianBlurFilter setValue:inputImage forKey:kCIInputImageKey];
[gaussianBlurFilter setValue:@5 forKey:kCIInputRadiusKey];
CIImage *outputImage = [gaussianBlurFilter outputImage];
CIContext *context = [CIContext contextWithOptions:nil];
CGImageRef cgimg = [context createCGImage:outputImage fromRect:[inputImage extent]]; // note, use input image extent if you want it the same size, the output image extent is larger
UIImage *convertedImage = [UIImage imageWithCGImage:cgimg];
return convertedImage;
}
核心代码是[gaussianBlurFilter setValue:@5 forKey:kCIInputRadiusKey];
但是我测试100也没啥问题 没有测试出最大值
以上是几种高斯模糊的相关代码
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