关于libqrencode报错的问题
导入libqrencode之后报错的解决思路
1 查看QRCodeGenerator.h 中是否导入 #import <UIKit/UIKit.h>
2 config.h导入错误 解决方法最直接的自己创建一个pch包含这个config.h pch的创建网上百度就可以了，注意用相对路径
网上说另外一种方法
我尝试还是不行，还有就是说用CocoaPods创建一个项目就好了，但是我感觉最简单最有效的就是创建一个pch文件包含config.h那个文件
3 libqrencode 在 github上面的下载地址 https://github.com/fukuchi/libqrencode
4 QRCodeGenerator.h文件
#import <Foundation/Foundation.h>
#import <UIKit/UIKit.h>
@interface QRCodeGenerator : NSObject
+ (UIImage *)qrImageForString:(NSString *)string imageSize:(CGFloat)size;
@end
#import "QRCodeGenerator.h"
#import <qrencode.h>
enum {
qr_margin = 3
};
QRCodeGenerator.m文件
@implementation QRCodeGenerator
+ (void)drawQRCode:(QRcode *)code context:(CGContextRef)ctx size:(CGFloat)size {
unsigned char *data = 0;
int width;
data = code->data;
width = code->width;
float zoom = (double)size / (code->width + 2.0 * qr_margin);
CGRect rectDraw = CGRectMake(0, 0, zoom, zoom);
// draw
CGContextSetFillColor(ctx, CGColorGetComponents([UIColor blackColor].CGColor));
for(int i = 0; i < width; ++i) {
for(int j = 0; j < width; ++j) {
if(*data & 1) {
rectDraw.origin = CGPointMake((j + qr_margin) * zoom,(i + qr_margin) * zoom);
CGContextAddRect(ctx, rectDraw);
}
++data;
}
}
CGContextFillPath(ctx);
}
+ (UIImage *)qrImageForString:(NSString *)string imageSize:(CGFloat)size {
if (![string length]) {
return nil;
}
QRcode *code = QRcode_encodeString([string UTF8String], 0, QR_ECLEVEL_L, QR_MODE_8, 1);
if (!code) {
return nil;
}
// create context
CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceRGB();
CGContextRef ctx = CGBitmapContextCreate(0, size, size, 8, size * 4, colorSpace, kCGImageAlphaPremultipliedLast);
CGAffineTransform translateTransform = CGAffineTransformMakeTranslation(0, -size);
CGAffineTransform scaleTransform = CGAffineTransformMakeScale(1, -1);
CGContextConcatCTM(ctx, CGAffineTransformConcat(translateTransform, scaleTransform));
// draw QR on this context
[QRCodeGenerator drawQRCode:code context:ctx size:size];
// get image
CGImageRef qrCGImage = CGBitmapContextCreateImage(ctx);
UIImage * qrImage = [UIImage imageWithCGImage:qrCGImage];
// some releases
CGContextRelease(ctx);
CGImageRelease(qrCGImage);
CGColorSpaceRelease(colorSpace);
QRcode_free(code);
return qrImage;
}
@end
5 控制器只用导入
#import "QRCodeGenerator.h"
在viewDidLoad中添加这段代码就ok了
UIImageView *imgView = [[UIImageView alloc] initWithFrame:CGRectMake(10, 50, 200, 200)];
imgView.image = [QRCodeGenerator qrImageForString:@"你需要输入的链接" imageSize:200];
[self.view addSubview:imgView];