效果如下：
ViewController.h
1 #import <UIKit/UIKit.h> 2 @interface ViewController : UIViewController 3 @property (strong, nonatomic) IBOutlet UIImageView *imgVQRCode; 4 5 @end
ViewController.m
1 #import "ViewController.h"
2 #import "KMQRCode.h"
3 #import "UIImage+RoundedRectImage.h"
4
5 @interface ViewController ()
6 - (void)layoutUI;
7 @end
8
9 @implementation ViewController
10
11 - (void)viewDidLoad {
12 [super viewDidLoad];
13
14 [self layoutUI];
15 }
16
17 - (void)didReceiveMemoryWarning {
18 [super didReceiveMemoryWarning];
19 // Dispose of any resources that can be recreated.
20 }
21
22 - (void)layoutUI {
23 //用于生成二维码的字符串source
24 NSString *source = @"https://github.com/KenmuHuang";
25
26 //使用iOS 7后的CIFilter对象操作，生成二维码图片imgQRCode（会拉伸图片，比较模糊，效果不佳）
27 CIImage *imgQRCode = [KMQRCode createQRCodeImage:source];
28
29 //使用核心绘图框架CG（Core Graphics）对象操作，进一步针对大小生成二维码图片imgAdaptiveQRCode（图片大小适合，清晰，效果好）
30 UIImage *imgAdaptiveQRCode = [KMQRCode resizeQRCodeImage:imgQRCode
31 withSize:_imgVQRCode.frame.size.width];
32
33 //默认产生的黑白色的二维码图片；我们可以让它产生其它颜色的二维码图片，例如：蓝白色的二维码图片
34 imgAdaptiveQRCode = [KMQRCode specialColorImage:imgAdaptiveQRCode
35 withRed:33.0
36 green:114.0
37 blue:237.0]; //0~255
38
39 //使用核心绘图框架CG（Core Graphics）对象操作，创建带圆角效果的图片
40 UIImage *imgIcon = [UIImage createRoundedRectImage:[UIImage imageNamed:@"QRCode"]
41 withSize:CGSizeMake(70.0, 93.0)
42 withRadius:10];
43 //使用核心绘图框架CG（Core Graphics）对象操作，合并二维码图片和用于中间显示的图标图片
44 imgAdaptiveQRCode = [KMQRCode addIconToQRCodeImage:imgAdaptiveQRCode
45 withIcon:imgIcon
46 withIconSize:imgIcon.size];
47
48 // imgAdaptiveQRCode = [KMQRCode addIconToQRCodeImage:imgAdaptiveQRCode
49 // withIcon:imgIcon
50 // withScale:3];
51
52 _imgVQRCode.image = imgAdaptiveQRCode;
53 //设置图片视图的圆角边框效果
54 _imgVQRCode.layer.masksToBounds = YES;
55 _imgVQRCode.layer.cornerRadius = 10.0;
56 _imgVQRCode.layer.borderColor = [UIColor lightGrayColor].CGColor;
57 _imgVQRCode.layer.borderWidth = 4.0;
58 }
59
60 @end
?UIImage+RoundedRectImage.h
1 #import <UIKit/UIKit.h> 2 3 @interface UIImage (RoundedRectImage) 4 + (UIImage *)createRoundedRectImage:(UIImage *)image withSize:(CGSize)size withRadius:(NSInteger)radius; 5 6 @end
UIImage+RoundedRectImage.m
1 #import "UIImage+RoundedRectImage.h"
2
3 @implementation UIImage (RoundedRectImage)
4
5 #pragma mark - Private Methods
6 static void addRoundedRectToPath(CGContextRef contextRef, CGRect rect, float widthOfRadius, float heightOfRadius) {
7 float fw, fh;
8 if (widthOfRadius == 0 || heightOfRadius == 0)
9 {
10 CGContextAddRect(contextRef, rect);
11 return;
12 }
13
14 CGContextSaveGState(contextRef);
15 CGContextTranslateCTM(contextRef, CGRectGetMinX(rect), CGRectGetMinY(rect));
16 CGContextScaleCTM(contextRef, widthOfRadius, heightOfRadius);
17 fw = CGRectGetWidth(rect) / widthOfRadius;
18 fh = CGRectGetHeight(rect) / heightOfRadius;
19
20 CGContextMoveToPoint(contextRef, fw, fh/2); // Start at lower right corner
21 CGContextAddArcToPoint(contextRef, fw, fh, fw/2, fh, 1); // Top right corner
22 CGContextAddArcToPoint(contextRef, 0, fh, 0, fh/2, 1); // Top left corner
23 CGContextAddArcToPoint(contextRef, 0, 0, fw/2, 0, 1); // Lower left corner
24 CGContextAddArcToPoint(contextRef, fw, 0, fw, fh/2, 1); // Back to lower right
25
26 CGContextClosePath(contextRef);
27 CGContextRestoreGState(contextRef);
28 }
29
30 #pragma mark - Public Methods
31 + (UIImage *)createRoundedRectImage:(UIImage *)image withSize:(CGSize)size withRadius:(NSInteger)radius {
32 int w = size.width;
33 int h = size.height;
34
35 CGColorSpaceRef colorSpaceRef = CGColorSpaceCreateDeviceRGB();
36 CGContextRef contextRef = CGBitmapContextCreate(NULL, w, h, 8, 4 * w, colorSpaceRef, (CGBitmapInfo)kCGImageAlphaPremultipliedFirst);
37 CGRect rect = CGRectMake(0, 0, w, h);
38
39 CGContextBeginPath(contextRef);
40 addRoundedRectToPath(contextRef, rect, radius, radius);
41 CGContextClosePath(contextRef);
42 CGContextClip(contextRef);
43 CGContextDrawImage(contextRef, CGRectMake(0, 0, w, h), image.CGImage);
44 CGImageRef imageMasked = CGBitmapContextCreateImage(contextRef);
45 UIImage *img = [UIImage imageWithCGImage:imageMasked];
46
47 CGContextRelease(contextRef);
48 CGColorSpaceRelease(colorSpaceRef);
49 CGImageRelease(imageMasked);
50 return img;
51 }
52
53 @end
KMQRCode.h
1 #import <UIKit/UIKit.h> 2 3 @interface KMQRCode : NSObject 4 + (CIImage *)createQRCodeImage:(NSString *)source; 5 + (UIImage *)resizeQRCodeImage:(CIImage *)image withSize:(CGFloat)size; 6 + (UIImage *)specialColorImage:(UIImage*)image withRed:(CGFloat)red green:(CGFloat)green blue:(CGFloat)blue; 7 + (UIImage *)addIconToQRCodeImage:(UIImage *)image withIcon:(UIImage *)icon withIconSize:(CGSize)iconSize; 8 + (UIImage *)addIconToQRCodeImage:(UIImage *)image withIcon:(UIImage *)icon withScale:(CGFloat)scale; 9 10 @end
KMQRCode.m
1 #import "KMQRCode.h"
2
3 @implementation KMQRCode
4
5 #pragma mark - Private Methods
6 void ProviderReleaseData (void *info, const void *data, size_t size){
7 free((void*)data);
8 }
9
10 #pragma mark - Public Methods
11 + (CIImage *)createQRCodeImage:(NSString *)source {
12 NSData *data = [source dataUsingEncoding:NSUTF8StringEncoding];
13
14 CIFilter *filter = [CIFilter filterWithName:@"CIQRCodeGenerator"];
15 [filter setValue:data forKey:@"inputMessage"];
16 [filter setValue:@"Q" forKey:@"inputCorrectionLevel"]; //设置纠错等级越高；即识别越容易，值可设置为L(Low) | M(Medium) | Q | H(High)
17 return filter.outputImage;
18 }
19
20 + (UIImage *)resizeQRCodeImage:(CIImage *)image withSize:(CGFloat)size {
21 CGRect extent = CGRectIntegral(image.extent);
22 CGFloat scale = MIN(size/CGRectGetWidth(extent), size/CGRectGetHeight(extent));
23 size_t width = CGRectGetWidth(extent) * scale;
24 size_t height = CGRectGetHeight(extent) * scale;
25 CGColorSpaceRef colorSpaceRef = CGColorSpaceCreateDeviceGray();
26
27 CGContextRef contextRef = CGBitmapContextCreate(nil, width, height, 8, 0, colorSpaceRef, (CGBitmapInfo)kCGImageAlphaNone);
28 CIContext *context = [CIContext contextWithOptions:nil];
29 CGImageRef imageRef = [context createCGImage:image fromRect:extent];
30 CGContextSetInterpolationQuality(contextRef, kCGInterpolationNone);
31 CGContextScaleCTM(contextRef, scale, scale);
32 CGContextDrawImage(contextRef, extent, imageRef);
33
34 CGImageRef imageRefResized = CGBitmapContextCreateImage(contextRef);
35
36 //Release
37 CGContextRelease(contextRef);
38 CGImageRelease(imageRef);
39 return [UIImage imageWithCGImage:imageRefResized];
40 }
41
42 + (UIImage *)specialColorImage:(UIImage*)image withRed:(CGFloat)red green:(CGFloat)green blue:(CGFloat)blue {
43 const int imageWidth = image.size.width;
44 const int imageHeight = image.size.height;
45 size_t bytesPerRow = imageWidth * 4;
46 uint32_t* rgbImageBuf = (uint32_t*)malloc(bytesPerRow * imageHeight);
47
48 //Create context
49 CGColorSpaceRef colorSpaceRef = CGColorSpaceCreateDeviceRGB();
50 CGContextRef contextRef = CGBitmapContextCreate(rgbImageBuf, imageWidth, imageHeight, 8, bytesPerRow, colorSpaceRef, kCGBitmapByteOrder32Little | kCGImageAlphaNoneSkipLast);
51 CGContextDrawImage(contextRef, CGRectMake(0, 0, imageWidth, imageHeight), image.CGImage);
52
53 //Traverse pixe
54 int pixelNum = imageWidth * imageHeight;
55 uint32_t* pCurPtr = rgbImageBuf;
56 for (int i = 0; i < pixelNum; i++, pCurPtr++){
57 if ((*pCurPtr & 0xFFFFFF00) < 0x99999900){
58 //Change color
59 uint8_t* ptr = (uint8_t*)pCurPtr;
60 ptr[3] = red; //0~255
61 ptr[2] = green;
62 ptr[1] = blue;
63 }else{
64 uint8_t* ptr = (uint8_t*)pCurPtr;
65 ptr[0] = 0;
66 }
67 }
68
69 //Convert to image
70 CGDataProviderRef dataProviderRef = CGDataProviderCreateWithData(NULL, rgbImageBuf, bytesPerRow * imageHeight, ProviderReleaseData);
71 CGImageRef imageRef = CGImageCreate(imageWidth, imageHeight, 8, 32, bytesPerRow, colorSpaceRef,
72 kCGImageAlphaLast | kCGBitmapByteOrder32Little, dataProviderRef,
73 NULL, true, kCGRenderingIntentDefault);
74 CGDataProviderRelease(dataProviderRef);
75 UIImage* img = [UIImage imageWithCGImage:imageRef];
76
77 //Release
78 CGImageRelease(imageRef);
79 CGContextRelease(contextRef);
80 CGColorSpaceRelease(colorSpaceRef);
81 return img;
82 }
83
84 +(UIImage *)addIconToQRCodeImage:(UIImage *)image withIcon:(UIImage *)icon withIconSize:(CGSize)iconSize {
85 UIGraphicsBeginImageContext(image.size);
86 //通过两张图片进行位置和大小的绘制，实现两张图片的合并；其实此原理做法也可以用于多张图片的合并
87 CGFloat widthOfImage = image.size.width;
88 CGFloat heightOfImage = image.size.height;
89 CGFloat widthOfIcon = iconSize.width;
90 CGFloat heightOfIcon = iconSize.height;
91
92 [image drawInRect:CGRectMake(0, 0, widthOfImage, heightOfImage)];
93 [icon drawInRect:CGRectMake((widthOfImage-widthOfIcon)/2, (heightOfImage-heightOfIcon)/2,
94 widthOfIcon, heightOfIcon)];
95 UIImage *img = UIGraphicsGetImageFromCurrentImageContext();
96
97 UIGraphicsEndImageContext();
98 return img;
99 }
100
101 +(UIImage *)addIconToQRCodeImage:(UIImage *)image withIcon:(UIImage *)icon withScale:(CGFloat)scale {
102 UIGraphicsBeginImageContext(image.size);
103
104 //通过两张图片进行位置和大小的绘制，实现两张图片的合并；其实此原理做法也可以用于多张图片的合并
105 CGFloat widthOfImage = image.size.width;
106 CGFloat heightOfImage = image.size.height;
107 CGFloat widthOfIcon = widthOfImage/scale;
108 CGFloat heightOfIcon = heightOfImage/scale;
109
110 [image drawInRect:CGRectMake(0, 0, widthOfImage, heightOfImage)];
111 [icon drawInRect:CGRectMake((widthOfImage-widthOfIcon)/2, (heightOfImage-heightOfIcon)/2,
112 widthOfIcon, heightOfIcon)];
113 UIImage *img = UIGraphicsGetImageFromCurrentImageContext();
114
115 UIGraphicsEndImageContext();
116 return img;
117 }
118
119 @end
时间： 2024-09-26 23:26:15