生成简单的二维码

今天给大家讲讲成简单的二维码。

- (void)viewDidLoad {
    [super viewDidLoad];
    UIView *view = [[UIView alloc]initWithFrame:CGRectMake(20, 400, 100, 50)];
    [self.view addSubview:view];
    view.backgroundColor = [UIColor redColor];
    // Do any additional setup after loading the view, typically from a nib.
}
- (void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event {
    // 创建过滤器
    CIFilter *filter = [CIFilter filterWithName:@"CIQRCodeGenerator"];
    //恢复默认
    [filter setDefaults];
    //给过滤器添加数据
    NSString *url = @"www.taobao.com";
    NSData *data = [url dataUsingEncoding:NSUTF8StringEncoding];
    [filter setValue:data forKey:@"inputMessage"];
    // 获取输出的二维码
    CIImage *outputImage = [filter outputImage];
    
    //显示二维码
    UIImageView *imageView = [[UIImageView alloc]initWithFrame:CGRectMake(0, 0, 200, 200)];
    [self.view addSubview:imageView];
    imageView.image = [UIImage imageWithCIImage:outputImage];
    
    
    
    
    
}

之后用手机一扫描就OKle 这是生成简单的二维码，代码很少，希望大家自己研究会了！

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