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iOS7 設置背景圖片或導航為毛玻璃效果

編輯:IOS開發綜合

1.首先導入系統庫 Accelerate.framework


2.其次在要實現毛玻璃效果的頁面添加頭文件 #import


3.再次添加實現函數如下:


//加模糊效果函數,傳入參數:image是圖片,blur是模糊度(0~2.0之間)

- (UIImage *)blurryImage:(UIImage *)image withBlurLevel:(CGFloat)blur

{

//模糊度,

if ((blur < 0.1f) || (blur > 2.0f))

{

blur = 0.5f;

}

//boxSize必須大於0

int boxSize = (int)(blur * 100);

boxSize -= (boxSize % 2) + 1;

NSLog(@"boxSize:%i",boxSize);

//圖像處理

CGImageRef img = image.CGImage;

//圖像緩存,輸入緩存,輸出緩存

vImage_Buffer inBuffer, outBuffer;

vImage_Error error;

//像素緩存

void *pixelBuffer;

//數據源提供者,Defines an opaque type that supplies Quartz with data.

CGDataProviderRef inProvider = CGImageGetDataProvider(img);

// provider’s data.

CFDataRef inBitmapData = CGDataProviderCopyData(inProvider);

//寬,高,字節/行,data

inBuffer.width = CGImageGetWidth(img);

inBuffer.height = CGImageGetHeight(img);

inBuffer.rowBytes = CGImageGetBytesPerRow(img);

inBuffer.data = (void*)CFDataGetBytePtr(inBitmapData);

//像數緩存,字節行*圖片高

pixelBuffer = malloc(CGImageGetBytesPerRow(img) * CGImageGetHeight(img));

outBuffer.data = pixelBuffer;

outBuffer.width = CGImageGetWidth(img);

outBuffer.height = CGImageGetHeight(img);

outBuffer.rowBytes = CGImageGetBytesPerRow(img);

// 第三個中間的緩存區,抗鋸齒的效果

void *pixelBuffer2 = malloc(CGImageGetBytesPerRow(img) * CGImageGetHeight(img));

vImage_Buffer outBuffer2;

outBuffer2.data = pixelBuffer2;

outBuffer2.width = CGImageGetWidth(img);

outBuffer2.height = CGImageGetHeight(img);

outBuffer2.rowBytes = CGImageGetBytesPerRow(img);

//將一個隱式的M×N區域顆粒和具有箱式濾波器的效果的ARGB8888源圖像進行卷積運算得到作用區域。

error = vImageBoxConvolve_ARGB8888(&inBuffer, &outBuffer2, NULL, 0, 0, boxSize, boxSize, NULL, kvImageEdgeExtend);

error = vImageBoxConvolve_ARGB8888(&outBuffer2, &inBuffer, NULL, 0, 0, boxSize, boxSize, NULL, kvImageEdgeExtend);

error = vImageBoxConvolve_ARGB8888(&inBuffer, &outBuffer, NULL, 0, 0, boxSize, boxSize, NULL, kvImageEdgeExtend);

if (error)

{

NSLog(@"error from convolution %ld", error);

}

// NSLog(@"字節組成部分:%zu",CGImageGetBitsPerComponent(img));

//顏色空間DeviceRGB

CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceRGB();

//用圖片創建上下文,CGImageGetBitsPerComponent(img),7,8

CGContextRef ctx = CGBitmapContextCreate(

outBuffer.data,

outBuffer.width,

outBuffer.height,

8,

outBuffer.rowBytes,

colorSpace,

CGImageGetBitmapInfo(image.CGImage));

//根據上下文,處理過的圖片,重新組件

CGImageRef imageRef = CGBitmapContextCreateImage (ctx);

UIImage *returnImage = [UIImage imageWithCGImage:imageRef];

//clean up

CGContextRelease(ctx);

CGColorSpaceRelease(colorSpace);

free(pixelBuffer);

free(pixelBuffer2);

CFRelease(inBitmapData);

CGImageRelease(imageRef);

return returnImage;

}

4.使用的時候直接傳入所需參數,將返回的image直接運行就可以了

UIImage * maoImage = [UIImage imageNamed:@"aboutBackImage.jpg"];;

tabBarImage.image = [self blurryImage:maoImage withBlurLevel:0.5];

大功告成,(*^__^*) ……小伙伴們快去試試效果吧~

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