生成二维码
//
// ViewController.m
// 二维码生成
//
#import "ViewController.h"
@interface ViewController ()
@property (weak, nonatomic) IBOutlet UIImageView *imageView;
@end
@implementation ViewController
- (void)viewDidLoad {
[super viewDidLoad];
// 使用coreImage框架中的滤镜来实现生成的二维码
// kCICategoryBuiltIn 内置的过滤器的分类
// NSArray *filters = [CIFilter filterNamesInCategory:kCICategoryBuiltIn];
// NSLog(@"%@",filters);
// 1.创建一个用于生成二维码的滤镜
CIFilter *qrFilter = [CIFilter filterWithName:@"CIQRCodeGenerator"];
// 2.设置默认值
[qrFilter setDefaults];
// 3.设置输入数据
// NSLog(@"%@",qrFilter.inputKeys);
[qrFilter setValue:[@"乔印帅死了!!!" dataUsingEncoding:NSUTF8StringEncoding] forKey:@"inputMessage"];
// 4.生成图片
CIImage *ciImage = qrFilter.outputImage;
// 默认生成的ciImage的大小是很小
// NSLog(@"%@",ciImage);
// 放大ciImage
CGAffineTransform scale = CGAffineTransformMakeScale(8, 8);
ciImage = [ciImage imageByApplyingTransform:scale];
// 5.设置二维码的前景色和背景色
CIFilter *colorFilter = [CIFilter filterWithName:@"CIFalseColor"];
// 设置默认值
[colorFilter setDefaults];
// 设置输入的值
/*
inputImage,
inputColor0,
inputColor1
*/
// NSLog(@"%@",colorFilter.inputKeys);
[colorFilter setValue:ciImage forKey:@"inputImage"];
// 设置前景色
[colorFilter setValue:[CIColor colorWithRed:1 green:0 blue:0] forKey:@"inputColor0"];
// 设置背景
[colorFilter setValue:[CIColor colorWithRed:0 green:0 blue:1] forKey:@"inputColor1"];
// 取出colorFilter中的图片
ciImage = colorFilter.outputImage;
// 在中心增加一张图片
UIImage *image = [UIImage imageWithCIImage:ciImage];
// 生成图片
// 1.开启图片的上下文
UIGraphicsBeginImageContext(image.size);
// 2.把二维码的图片划入
[image drawInRect:CGRectMake(0, 0, image.size.width, image.size.height)];
// 3.在中心画其他图片
UIImage *weiImage = [UIImage imageNamed:@"wei"];
CGFloat weiW = 40;
CGFloat weiH = 40;
CGFloat weiX = (image.size.width - weiW) * 0.5;
CGFloat weiY = (image.size.height - weiH) * 0.5;
[weiImage drawInRect:CGRectMake(weiX, weiY, weiW, weiH)];
// 取出图片
UIImage *qrImage = UIGraphicsGetImageFromCurrentImageContext();
// 结束上下文
UIGraphicsEndImageContext();
self.imageView.image = qrImage;
}
@end
