ios 生成二维码图片libqrencode

下载并导入 libqrencode文件，很小的
添加  #import "QRCodeGenerator.h"
@property (strong , nonatomic) UIImageView* qRImageView;
- (void)viewDidLoad
{
    [super viewDidLoad];
    self.qRImageView = [[UIImageView alloc] initWithFrame:CGRectMake(0, 0, 320, 400)];
     [self.view addSubview:self.qRImageView];
}

-(IBAction)qrBtnPress:(id)sender
{
    self.qRImageView.image = [QRCodeGenerator qrImageForString:@"二维码存储的字符串信息 asddsdd" imageSize:self.qRImageView.bounds.size.width];
}