在我的应用程序中,我想在 uiview 上应用模糊效果。那么我怎样才能实现模糊效果。
我尝试通过下面的代码:
UIGraphicsBeginImageContext(scrollview.bounds.size);
[scrollview.layer renderInContext:UIGraphicsGetCurrentContext()];
UIImage *viewImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
//Blur the UIImage with a CIFilter
CIImage *imageToBlur = [CIImage imageWithCGImage:viewImage.CGImage];
CIFilter *gaussianBlurFilter = [CIFilter filterWithName: @"CIGaussianBlur"];
[gaussianBlurFilter setValue:imageToBlur forKey: @"inputImage"];
[gaussianBlurFilter setValue:[NSNumber numberWithFloat:3] forKey: @"inputRadius"];
CIImage *resultImage = [gaussianBlurFilter valueForKey: @"outputImage"];
UIImage *endImage = [[UIImage alloc] initWithCIImage:resultImage];
//Place the UIImage in a UIImageView
UIImageView *newView = [[UIImageView alloc] initWithFrame:scrollview.bounds];
newView.image = endImage;
[scrollview addSubview:newView];
但使用此代码时遇到问题。当应用模糊效果时,时间视图变小。
只需将此模糊视图放在您想要模糊的视图(此处为您的BlurredView)上即可。下面是 Objective-C 中的一个例子:
UIVisualEffect *blurEffect;
blurEffect = [UIBlurEffect effectWithStyle:UIBlurEffectStyleLight];
UIVisualEffectView *visualEffectView;
visualEffectView = [[UIVisualEffectView alloc] initWithEffect:blurEffect];
visualEffectView.frame = yourBlurredView.bounds;
[yourBlurredView addSubview:visualEffectView];
和斯威夫特:
var visualEffectView = UIVisualEffectView(effect: UIBlurEffect(style: .light))
visualEffectView.frame = yourBlurredView.bounds
yourBlurredView.addSubview(visualEffectView)
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