1 #import "ViewController.h"
2
3
4
5 @interface ViewController ()
6
7 @property (strong, nonatomic) IBOutlet UIImageView *qrcodeView;
8
9 @property (nonatomic, strong) UIImageView *pictureView;
10
11
12
13 @end
14
15
16
17 @implementation ViewController
18
19
20
21 - (void)viewDidLoad {
22
23 [super viewDidLoad];
24
25 // Do any additional setup after loading the view, typically from a nib.
26
27 // 创建二维码图片
28
29 UIImage *qrcode = [self createNonInterpolatedUIImageFormCIImage:[self createQRForString:@"http://www.cnblogs.com/lurenq/p/5338576.html"] withSize:250.0f];
30
31 // 自定义二维码的颜色
32
33 UIImage *customQrcode = [self imageBlackToTransparent:qrcode withRed:0.0f andGreen:0.0f andBlue:255.0f];
34
35 self.qrcodeView.image = customQrcode;
36
37 // set shadow
38
39 self.qrcodeView.layer.shadowOffset = CGSizeMake(0, 2);
40
41 self.qrcodeView.layer.shadowRadius = 2;
42
43 self.qrcodeView.layer.shadowColor = [UIColor blackColor].CGColor;
44
45 self.qrcodeView.layer.shadowOpacity = 0.5;
46
47
48
49 // 添加标识图片
50
51 self.pictureView = [[UIImageView alloc] init];
52
53 self.pictureView.frame = CGRectMake(100, 100, 50, 50);
54
55 // icon , 不影响扫描
56
57 self.pictureView.image = [UIImage imageNamed:@"1"];
58
59 [self.qrcodeView addSubview:self.pictureView];
60
61
62
63
64
65 }
66
67
68
69
70
71 - (void)didReceiveMemoryWarning {
72
73 [super didReceiveMemoryWarning];
74
75 // Dispose of any resources that can be recreated.
76
77 }
78
79
80
81 #pragma mark - InterpolatedUIImage
82
83 - (UIImage *)createNonInterpolatedUIImageFormCIImage:(CIImage *)image withSize:(CGFloat) size {
84
85 CGRect extent = CGRectIntegral(image.extent);
86
87 CGFloat scale = MIN(size/CGRectGetWidth(extent), size/CGRectGetHeight(extent));
88
89 // create a bitmap image that we'll draw into a bitmap context at the desired size;
90
91 size_t width = CGRectGetWidth(extent) * scale;
92
93 size_t height = CGRectGetHeight(extent) * scale;
94
95 CGColorSpaceRef cs = CGColorSpaceCreateDeviceGray();
96
97 CGContextRef bitmapRef = CGBitmapContextCreate(nil, width, height, 8, 0, cs, (CGBitmapInfo)kCGImageAlphaNone);
98
99 CIContext *context = [CIContext contextWithOptions:nil];
100
101 CGImageRef bitmapImage = [context createCGImage:image fromRect:extent];
102
103 CGContextSetInterpolationQuality(bitmapRef, kCGInterpolationNone);
104
105 CGContextScaleCTM(bitmapRef, scale, scale);
106
107 CGContextDrawImage(bitmapRef, extent, bitmapImage);
108
109 // Create an image with the contents of our bitmap
110
111 CGImageRef scaledImage = CGBitmapContextCreateImage(bitmapRef);
112
113 // Cleanup
114
115 CGContextRelease(bitmapRef);
116
117 CGImageRelease(bitmapImage);
118
119 return [UIImage imageWithCGImage:scaledImage];
120
121 }
122
123
124
125 #pragma mark - QRCodeGenerator
126
127 - (CIImage *)createQRForString:(NSString *)qrString {
128
129 // Need to convert the string to a UTF-8 encoded NSData object
130
131 NSData *stringData = [qrString dataUsingEncoding:NSUTF8StringEncoding];
132
133 // Create the filter
134
135 CIFilter *qrFilter = [CIFilter filterWithName:@"CIQRCodeGenerator"];
136
137 // Set the message content and error-correction level
138
139 [qrFilter setValue:stringData forKey:@"inputMessage"];
140
141 [qrFilter setValue:@"M" forKey:@"inputCorrectionLevel"];
142
143 // Send the image back
144
145 return qrFilter.outputImage;
146
147 }
148
149
150
151 #pragma mark - imageToTransparent
152
153 void ProviderReleaseData (void *info, const void *data, size_t size){
154
155 free((void*)data);
156
157 }
158
159 - (UIImage*)imageBlackToTransparent:(UIImage*)image withRed:(CGFloat)red andGreen:(CGFloat)green andBlue:(CGFloat)blue{
160
161 const int imageWidth = image.size.width;
162
163 const int imageHeight = image.size.height;
164
165 size_t bytesPerRow = imageWidth * 4;
166
167 uint32_t* rgbImageBuf = (uint32_t*)malloc(bytesPerRow * imageHeight);
168
169 // create context
170
171 CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceRGB();
172
173 CGContextRef context = CGBitmapContextCreate(rgbImageBuf, imageWidth, imageHeight, 8, bytesPerRow, colorSpace,
174
175 kCGBitmapByteOrder32Little | kCGImageAlphaNoneSkipLast);
176
177 CGContextDrawImage(context, CGRectMake(0, 0, imageWidth, imageHeight), image.CGImage);
178
179 // traverse pixe
180
181 int pixelNum = imageWidth * imageHeight;
182
183 uint32_t* pCurPtr = rgbImageBuf;
184
185 for (int i = 0; i < pixelNum; i++, pCurPtr++){
186
187 if ((*pCurPtr & 0xFFFFFF00) < 0x99999900){
188
189 // change color
190
191 uint8_t* ptr = (uint8_t*)pCurPtr;
192
193 ptr[3] = red; //0~255
194
195 ptr[2] = green;
196
197 ptr[1] = blue;
198
199 }else{
200
201 uint8_t* ptr = (uint8_t*)pCurPtr;
202
203 ptr[0] = 0;
204
205 }
206
207 }
208
209 // context to image
210
211 CGDataProviderRef dataProvider = CGDataProviderCreateWithData(NULL, rgbImageBuf, bytesPerRow * imageHeight, ProviderReleaseData);
212
213 CGImageRef imageRef = CGImageCreate(imageWidth, imageHeight, 8, 32, bytesPerRow, colorSpace,
214
215 kCGImageAlphaLast | kCGBitmapByteOrder32Little, dataProvider,
216
217 NULL, true, kCGRenderingIntentDefault);
218
219 CGDataProviderRelease(dataProvider);
220
221 UIImage* resultUIImage = [UIImage imageWithCGImage:imageRef];
222
223 // release
224
225 CGImageRelease(imageRef);
226
227 CGContextRelease(context);
228
229 CGColorSpaceRelease(colorSpace);
230
231 return resultUIImage;
232
233 }
234
235 @end
236
237
