效果如下：透明度是0.54 blur:2 saturation:0
下面这种方法只有固定的类型可以选择 无法和UI保持一致
/*
毛玻璃的样式(枚举)
*/
UIImageView *bgImgView = [[UIImageView alloc] initWithFrame:self.view.bounds];
bgImgView.image = [UIImage imageNamed:@"huoying.jpg"];
[self.view addSubview:bgImgView];
UIBlurEffect *effect = [UIBlurEffect effectWithStyle:UIBlurEffectStyleDark];
UIVisualEffectView *effectView = [[UIVisualEffectView alloc] initWithEffect:effect];
effectView.frame = CGRectMake(0, 0, bgImgView.frame.size.width * 0.5, bgImgView.frame.size.height);
[bgImgView addSubview:effectView];
解决办法：
第一步：获取屏幕截图
- (UIImage *)getNormalImage:(UIView *)view {
UIGraphicsBeginImageContext(CGSizeMake(ScreenWidth, ScreenHeight));
CGContextRef context = UIGraphicsGetCurrentContext();
[view.layer renderInContext:context];
UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
returnimage;
}
这里传入的view应该是self.navigationController.view,如果传self.view 你获得的截图里没有导航栏
第二步：给截图设置毛玻璃参数
UIImageView *blur_imgv = [[UIImageView alloc]initWithFrame:self.BgView.bounds];
UIImage *im = [self getNormalImage:view];
blur_imgv.image = [im applyBlurWithRadius:2 tintColor:[UIColor colorWithWhite:1 alpha:0.54] saturationDeltaFactor:0 maskImage:nil];
[self.BgViewaddSubview:blur_imgv];
self.bgView为下面的灰色view 这里也可以直接加在你的自定义view上 frame和self.bgView设置一样
applyBlurWithRadius这个方法是我自己整理的一个第三方里的 ：#import "UIImage+ImageEffects.h",参数blurRadius:代表模糊程度，tintColor背景颜色,saturation：饱和度
applyBlurWithRadius这个方法要导入一个库：Accelerate.framework
这个第三方的.h .m如下（ps:网上找来的）
.h
#import
@import UIKit;
@interfaceUIImage (ImageEffects)
-(UIImage*)applyLightEffect;
-(UIImage*)applyExtraLightEffect;
-(UIImage*)applyDarkEffect;
-(UIImage*)applyTintEffectWithColor:(UIColor*)tintColor;
-(UIImage*)applyBlurWithRadius:(CGFloat)blurRadius tintColor:(UIColor*)tintColor saturationDeltaFactor:(CGFloat)saturationDeltaFactor maskImage:(UIImage*)maskImage;
@end
.m
#import
@implementationUIImage (ImageEffects)
-(UIImage*)applyLightEffect {
UIColor*tintColor =[UIColor colorWithWhite:1.0 alpha:0.3];
return[self applyBlurWithRadius:30 tintColor:tintColor saturationDeltaFactor:1.8 maskImage:nil];
}
-(UIImage*)applyExtraLightEffect {
UIColor*tintColor =[UIColor colorWithWhite:0.97 alpha:0.82];
return[self applyBlurWithRadius:20 tintColor:tintColor saturationDeltaFactor:1.8 maskImage:nil];
}
-(UIImage*)applyDarkEffect {
UIColor*tintColor =[UIColor colorWithWhite:0.11 alpha:0.73];
return[self applyBlurWithRadius:20 tintColor:tintColor saturationDeltaFactor:1.8 maskImage:nil];
}
-(UIImage*)applyTintEffectWithColor:(UIColor*)tintColor {
constCGFloatEffectColorAlpha =0.6;
UIColor*effectColor = tintColor;
size_t componentCount = CGColorGetNumberOfComponents(tintColor.CGColor);
if(componentCount ==2) {
CGFloatb;
if([tintColorgetWhite:&balpha:NULL]) {
effectColor = [UIColorcolorWithWhite:balpha:EffectColorAlpha];
}
}else{
CGFloatr, g, b;
if([tintColorgetRed:&rgreen:&gblue:&balpha:NULL]) {
effectColor = [UIColorcolorWithRed:rgreen:gblue:balpha:EffectColorAlpha];
}
}
return[self applyBlurWithRadius:10 tintColor:effectColor saturationDeltaFactor:-1.0 maskImage:nil];
}
-(UIImage*)applyBlurWithRadius:(CGFloat)blurRadius tintColor:(UIColor*)tintColor saturationDeltaFactor:(CGFloat)saturationDeltaFactor maskImage:(UIImage*)maskImage {
// Check pre-conditions. 检查前提条件
if(self.size.width <1||self.size.height <1){
NSLog(@"*** error: invalid size: (%.2f x %.2f). Both dimensions must be >= 1: %@",self.size.width,self.size.height,self);
returnnil;
}
if(!self.CGImage){
NSLog(@"*** error: image must be backed by a CGImage: %@",self);
returnnil;
}
if(maskImage &&!maskImage.CGImage){
NSLog(@"*** error: maskImage must be backed by a CGImage: %@", maskImage);
returnnil;
}
CGRectimageRect = {CGPointZero,self.size};
UIImage*effectImage =self;
BOOLhasBlur = blurRadius > __FLT_EPSILON__;
BOOLhasSaturationChange =fabs(saturationDeltaFactor -1.)> __FLT_EPSILON__;
if(hasBlur || hasSaturationChange) {
UIGraphicsBeginImageContextWithOptions(self.size, NO,[[UIScreen mainScreen] scale]);
CGContextRef effectInContext = UIGraphicsGetCurrentContext();
CGContextScaleCTM(effectInContext,1.0,-1.0);
CGContextTranslateCTM(effectInContext,0,-self.size.height);
CGContextDrawImage(effectInContext,imageRect,self.CGImage);
vImage_BuffereffectInBuffer;
effectInBuffer.data=CGBitmapContextGetData(effectInContext);
effectInBuffer.width=CGBitmapContextGetWidth(effectInContext);
effectInBuffer.height=CGBitmapContextGetHeight(effectInContext);
effectInBuffer.rowBytes=CGBitmapContextGetBytesPerRow(effectInContext);
UIGraphicsBeginImageContextWithOptions(self.size, NO, [[UIScreen mainScreen] scale]);
CGContextRef effectOutContext = UIGraphicsGetCurrentContext();
vImage_BuffereffectOutBuffer;
effectOutBuffer.data=CGBitmapContextGetData(effectOutContext);
effectOutBuffer.width=CGBitmapContextGetWidth(effectOutContext);
effectOutBuffer.height=CGBitmapContextGetHeight(effectOutContext);
effectOutBuffer.rowBytes=CGBitmapContextGetBytesPerRow(effectOutContext);
if(hasBlur){
// A description of how to compute the box kernel width from the Gaussian
// radius (aka standard deviation) appears in the SVG spec:
// http://www.w3.org/TR/SVG/filters.html#feGaussianBlurElement
//
// For larger values of 's' (s >= 2.0), an approximation can be used: Three
// successive box-blurs build a piece-wise quadratic convolution kernel, which
// approximates the Gaussian kernel to within roughly 3%.
//
// let d = floor(s * 3*sqrt(2*pi)/4 + 0.5)
//
// ... if d is odd, use three box-blurs of size 'd', centered on the output pixel.
//
CGFloatinputRadius = blurRadius *[[UIScreenmainScreen]scale];
NSUIntegerradius =floor(inputRadius *3.*sqrt(2* M_PI)/4+0.5);
if(radius %2!=1) {
radius +=1;// force radius to be odd so that the three box-blur methodology works.
}
vImageBoxConvolve_ARGB8888(&effectInBuffer,&effectOutBuffer,NULL,0,0, (uint32_t)radius, (uint32_t)radius,0,kvImageEdgeExtend);
vImageBoxConvolve_ARGB8888(&effectOutBuffer,&effectInBuffer,NULL,0,0, (uint32_t)radius, (uint32_t)radius,0,kvImageEdgeExtend);
vImageBoxConvolve_ARGB8888(&effectInBuffer,&effectOutBuffer,NULL,0,0, (uint32_t)radius, (uint32_t)radius,0,kvImageEdgeExtend);
}
BOOLeffectImageBuffersAreSwapped =NO;
if(hasSaturationChange) {
CGFloats = saturationDeltaFactor;
CGFloatfloatingPointSaturationMatrix[] = {
0.0722+0.9278* s,0.0722-0.0722* s,0.0722-0.0722* s,0,
0.7152-0.7152* s,0.7152+0.2848* s,0.7152-0.7152* s,0,
0.2126-0.2126* s,0.2126-0.2126* s,0.2126+0.7873* s,0,
0,0,0,1,
};
constint32_tdivisor =256;
NSUIntegermatrixSize =sizeof(floatingPointSaturationMatrix)/sizeof(floatingPointSaturationMatrix[0]);
int16_tsaturationMatrix[matrixSize];
for(NSUIntegeri =0; i < matrixSize; ++i) {
saturationMatrix[i] = (int16_t)roundf(floatingPointSaturationMatrix[i]* divisor);
}
if(hasBlur) {
vImageMatrixMultiply_ARGB8888(&effectOutBuffer,&effectInBuffer, saturationMatrix, divisor,NULL,NULL,kvImageNoFlags);
effectImageBuffersAreSwapped =YES;
}else{
vImageMatrixMultiply_ARGB8888(&effectInBuffer,&effectOutBuffer, saturationMatrix, divisor,NULL,NULL,kvImageNoFlags);
}
}
if(!effectImageBuffersAreSwapped)
effectImage =UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
if(effectImageBuffersAreSwapped)
effectImage =UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
}
// Set up output context. 设置输出上下文
UIGraphicsBeginImageContextWithOptions(self.size, NO, [[UIScreen mainScreen] scale]);
CGContextRef outputContext = UIGraphicsGetCurrentContext();
CGContextScaleCTM(outputContext,1.0, -1.0);
CGContextTranslateCTM(outputContext, 0, -self.size.height);
// Draw base image. 绘制基准图像
CGContextDrawImage(outputContext, imageRect,self.CGImage);
// Draw effect image. 绘制效果图像
if(hasBlur) {
CGContextSaveGState(outputContext);
if(maskImage) {
CGContextClipToMask(outputContext, imageRect, maskImage.CGImage);
}
CGContextDrawImage(outputContext, imageRect, effectImage.CGImage);
CGContextRestoreGState(outputContext);
}
// Add in color tint. 添加颜色渲染
if(tintColor) {
CGContextSaveGState(outputContext);
CGContextSetFillColorWithColor(outputContext, tintColor.CGColor);
CGContextFillRect(outputContext, imageRect);
CGContextRestoreGState(outputContext);
}
// Output image is ready. 输出图像
UIImage*outputImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
returnoutputImage;
}
@end