关于二维码的简单使用

生成二维码: 
1. 下载libqrencode三方后, 拉入工程 
2. 在头文件引用 #import “QRCodeGenerator.h” 
3. 效果图: 
4. 

 
代码:

// 文本框 UITextField *textfield = [[UITextField alloc] initWithFrame:CGRectMake(20, 20, 200, 50)]; [self.view addSubview:textfield]; textfield.backgroundColor = [UIColor grayColor]; textfield.placeholder = @"请输入文字"; textfield.tag = 1; // 按钮 UIButton *button = [UIButton buttonWithType:UIButtonTypeSystem]; button.frame = CGRectMake(250, 20, 50, 50); [self.view addSubview:button]; button.backgroundColor = [UIColor orangeColor]; [button setTitle:@"生成" forState:UIControlStateNormal]; [button addTarget:self action:@selector(QRCode) forControlEvents:UIControlEventTouchUpInside];

方法:

- (void)QRCode { UITextField *textfield = [self.view viewWithTag:1]; UIImage *image = [QRCodeGenerator qrImageForString:textfield.text imageSize:200]; UIImageView *imageView = [[UIImageView alloc] initWithFrame:CGRectMake(50, 70, 200, 200)]; imageView.center = self.view.center; imageView.image = image; [self.view addSubview:imageView]; } warning

如果在编译中爆出c99错误, 可以在#import “QRCodeGenerator.h”文件中, 引用: