已經可以從iOS SDK呼叫method來掃描QRCode，那麼是否也能從iOS SDK來產生 QRCode (QRCode Generator)？
原來CoreImage Framework已能做到！
直接來看程式碼，把它寫成可重複使用的Library吧～
/**
Theme: QRCode Generator
IDE: Xcode 8
Language: Objective C
Date: 106/08/17
Author: HappyMan
Blog: https://cg2010studio.com/
*/
// .h檔
#import <Foundation/Foundation.h>
@interface SDQRCodeGenerator : NSObject
+(UIImage *)qrCodeWithString:(NSString *)string width:(CGFloat)width;
@end
// .m檔
#import "SDQRCodeGenerator.h"
#import <CoreImage/CoreImage.h>
@implementation SDQRCodeGenerator
+(UIImage *)qrCodeWithString:(NSString *)string width:(CGFloat)width
{
CIFilter *filter = [CIFilter filterWithName:@"CIQRCodeGenerator"];
[filter setDefaults];
NSData *data = [string dataUsingEncoding:NSUTF8StringEncoding];
[filter setValue:data forKey:@"inputMessage"];
CIImage *outputImage = [filter outputImage];
return [self createNonInterpolatedImageFromCIImage:outputImage withSize:width];
}
+(UIImage *)createNonInterpolatedImageFromCIImage:(CIImage *)image withSize:(CGFloat)size
{
CGFloat screenScale = [[UIScreen mainScreen] scale];
CGRect extent = image.extent;
CGFloat scale = MIN(size/CGRectGetWidth(extent), size/CGRectGetHeight(extent));
size_t width = scale * CGRectGetWidth(extent);
size_t height = scale * CGRectGetHeight(extent);
UIGraphicsBeginImageContextWithOptions(CGSizeMake(width, height), NO, screenScale);
CGContextRef bitmapContextRef = UIGraphicsGetCurrentContext();
CIContext *context = [CIContext contextWithOptions:nil];
CGImageRef bitmapImage = [context createCGImage:image fromRect:extent];
CGContextSetInterpolationQuality(bitmapContextRef, kCGInterpolationNone);
CGContextScaleCTM(bitmapContextRef, scale, scale);
CGContextDrawImage(bitmapContextRef, extent, bitmapImage);
UIImage *retVal = UIGraphicsGetImageFromCurrentImageContext();
CGImageRelease(bitmapImage);
CGContextRelease(bitmapContextRef);
return retVal;
}
// 使用方式
qrCodeImageView.image = [SDQRCodeGenerator qrCodeWithString:@"Happy Girl" width:qrCodeImageView.frame.size.width];
現在超商很常掃描QR Code或Bar Code，這樣就不必記複雜的代碼囉～
之前開發過好幾支超商與百貨公司的App，這個已是必備功能！
逍遙文工作室 
Comments on: "[iOS] 產生 QRCode (QRCode Generator)" (1)
這時要製作地球天堂App，可以派上用場！ 😉
讚讚