- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event

{

/**  1 實例化二維碼濾鏡  */


CIFilter * filter = [CIFilter filterWithName:@"CIQRCodeGenerator"];
/**  2 恢復濾鏡默認設(shè)置  */

[filter setDefaults];

/**  3 設(shè)置二維碼內(nèi)容  */
NSData *data = [@"http://www.baidu.com" dataUsingEncoding:NSUTF8StringEncoding];

[filter setValue:data forKey:@"inputMessage"];

CIImage * outputImage = [filter outputImage];
/** 4 顯示二維碼  */
self.coreImage.image = [UIImage imageWithCIImage:outputImage];

}