1。拖拽控件
2.创建ShadowView，继承UIView
2.1. .m中写入：
//引入头文件
#import
#define kWidth [UIScreen mainScreen].bounds.size.width
#define kHeight [UIScreen mainScreen].bounds.size.height
#define customShowSize CGSizeMake(200,200);
3.ViewController中
#import "ViewController.h"
@interface ViewController ()
@property (weak, nonatomic) IBOutlet UITextField *contentTF;
@property (weak, nonatomic) IBOutlet UIImageView *imgV;
- (IBAction)AnNiu:(id)sender;
@ end
@ implementation ViewController
- (void) viewDidLoad {
[super viewDidLoad];
}
- (void) didReceiveMemoryWarning {
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
- (IBAction)AnNiu:(id)sender {
self.imgV.image= [self createQRImageWithString:self.contentTF.text size:_imgV.frame.size];
}
- (UIImage*)createQRImageWithString:(NSString*)string size:(CGSize)size
{
NSData * stringData = [string dataUsingEncoding:NSUTF8StringEncoding];
CIFilter * qrFilter = [CIFilterfilterWithName:@"CIQRCodeGenerator"];
// NSLog(@"%@",qrFilter.inputKeys);
[qrFilter setValue : stringData forKey:@"inputMessage"];
[qrFilter setValue:@"M" forKey:@"inputCorrectionLevel"];
CIImage * qrImage = qrFilter.outputImage;
//放大并绘制二维码 (上面生成的二维码很小,需要放大)
CGImageRef cgImage = [[CIContext contextWithOptions : nil] createCGImage : qrImage fromRect : qrImage.extent];
UIGraphicsBeginImageContext(size);
CGContextRef context = UIGraphicsGetCurrentContext();
CGContextSetInterpolationQuality ( context , kCGInterpolationNone);
//翻转一下图片 不然生成的QRCode就是上下颠倒的
CGContextScaleCTM(context,1.0, -1.0);
CGContextDrawImage(context, CGContextGetClipBoundingBox(context), cgImage);
UIImage * codeImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
CGImageRelease(cgImage);
return codeImage;
}
@ end
*4.（保存二维码到沙盒）
//拿到图片
UIImage*imagesave =self.imgV.image;
NSString*path =NSHomeDirectory();
//设置一个图片的存储路径
NSString*imagePath = [pathstringByAppendingString:@"/Documents/test.png"];
//把图片直接保存到指定的路径（同时应该把图片的路径imagePath存起来，下次就可以直接用来取）
[UIImagePNGRepresentation(imagesave) writeToFile:imagePath atomically:YES];
*4.1 （二级界面查看沙盒二维码）
// 读取沙盒路径图片
NSString *aPath3=[NSString stringWithFormat:@"%@/Documents/%@.png",NSHomeDirectory(),@"test"];
// 拿到沙盒路径图片
NSData*imgData = [[NSDataalloc]initWithContentsOfFile:aPath3];
UIImage*imgFromUrl3=[[UIImagealloc]initWithData:imgData];
self.imgVV.image= imgFromUrl3;
