Set the background image or navigation to frosted glass in iOS7

Set the background image or navigation to frosted glass in iOS7

1. First import the system library Accelerate. framework

2. Add the header file # import

3. Add the implementation function again as follows:

// Blur function. input parameter: image is an image, and blur is a blur (0 ~ Between 2.0)
-(UIImage *) blurryImage :( UIImage *) image withBlurLevel :( CGFloat) blur
{
// Blur,
If (blur <0.1f) | (blur> 2.0f ))
{
Blur = 0.5f;
}
    
// BoxSize must be greater than 0
Int boxSize = (int) (blur * 100 );
BoxSize-= (boxSize % 2) + 1;
NSLog (@ "boxSize: % I", boxSize );
// Image Processing
CGImageRef img = image. CGImage;
    
// Image cache, input cache, and output Cache
VImage_Buffer inBuffer, outBuffer;
VImage_Error error;
// Pixel Cache
Void * pixelBuffer;
    
// Data source provider, Defines an opaque type that supplies Quartz with data.
CGDataProviderRef inProvider = CGImageGetDataProvider (img );
// Provider's data.
CFDataRef inBitmapData = CGDataProviderCopyData (inProvider );
    
// Width, height, byte/row, data
InBuffer. width = CGImageGetWidth (img );
InBuffer. height = CGImageGetHeight (img );
InBuffer. rowBytes = CGImageGetBytesPerRow (img );
InBuffer. data = (void *) CFDataGetBytePtr (inBitmapData );
    
// Image size cache, byte rows * Image Height
PixelBuffer = malloc (CGImageGetBytesPerRow (img) * CGImageGetHeight (img ));
    
OutBuffer. data = pixelBuffer;
OutBuffer. width = CGImageGetWidth (img );
OutBuffer. height = CGImageGetHeight (img );
OutBuffer. rowBytes = CGImageGetBytesPerRow (img );
    
// The third intermediate cache area, anti-aliasing Effect
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 );
    
// Perform convolution on an implicit m×n area particle and an ARGB8888 source image with a box filter to obtain the target area.
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 (@ "Byte composition: % zu", CGImageGetBitsPerComponent (img ));
// Color Space DeviceRGB
CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceRGB ();
// Use an image to create the context, CGImageGetBitsPerComponent (img ),
CGContextRef ctx = CGBitmapContextCreate (
OutBuffer. data,
OutBuffer. width,
OutBuffer. height,
8,
OutBuffer. rowBytes,
ColorSpace,
CGImageGetBitmapInfo (image. CGImage ));
    
// Re-component the processed image according to the context
CGImageRef imageRef = CGBitmapContextCreateImage (ctx );
UIImage * returnImage = [UIImage imageWithCGImage: imageRef];
    
// Clean up
CGContextRelease (ctx );
Cgcolorspacerelstrap (colorSpace );
    
Free (pixelBuffer );
Free (pixelBuffer2 );
CFRelease (inBitmapData );
    
CGImageRelease (imageRef );
    
Return returnImage;
}
4. directly input the required parameters when using the image and run the returned image directly.
UIImage * maoImage = [UIImage imageNamed: @ "aboutBackImage.jpg"];
    
TabBarImage. image = [self blurryImage: maoImage withBlurLevel: 0.5];

Success! (* ^__ ^ *)...... Let's try the results ~