iOS 创建PDF文件并在文件中绘制波形图和文字

// 1、.m文件

////  CreatePDFImage.m//  Helo////  Created by 杨峰 on 2017/12/25.//  Copyright © 2017年 seedmorn. All rights reserved.//#import "CreatePDFImage.h"#import <CoreText/CoreText.h>@implementation CreatePDFImage- (instancetype)init {    self = [super init];    if (self) {        // defaults File Name        self.fileName = @"EcgImageView";                // defaults String        self.Title = @"Health Report";        self.Message_1 = @"The report is for reference only";        self.Message_2 = @"Name:fabio Sex:Male Age:45 Height:170cm Weight:83kg";        self.Message_3 = @"Average HR: 77bpm";        self.Message_4 = @"Gain: 10mm/mv Walking speed: 25mm/s Date: 2017-11-29 11:58:28";                // defaults values        self.FileWidth = 900;        self.CellHeight = 45;        self.CellPointCount = 2800;        self.CellGap = 30;        self.Top = 100;        self.Left = 10;        self.Right = 10;        self.GridWidth = 15;        self.GridLineWidth = 0.5;        self.LineWidth = 1.0;            }    return self;}- (void)CreatePdfFile:(NSArray *)array {        // 1.设置页面大小    CGFloat myPageWidth = _FileWidth;    CGFloat myPageHeight = [UIScreen mainScreen].bounds.size.height;    CGRect mediaBox = CGRectMake (0, 0, myPageWidth, myPageHeight);        // 2.设置pdf文档存储的路径    NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);    NSString *documentsDirectory = paths[0];    NSString *filePath = [documentsDirectory stringByAppendingString:[NSString stringWithFormat:@"/%@.pdf",_fileName]];    const char *cfilePath = [filePath UTF8String];    CFStringRef pathRef = CFStringCreateWithCString(NULL, cfilePath, kCFStringEncodingUTF8);        // 3.设置当前pdf页面的属性    CFStringRef myKeys[1];    CFTypeRef myValues[1];    myKeys[0] = kCGPDFContextMediaBox;    myValues[0] = (CFTypeRef) CFDataCreate(NULL,(const UInt8 *)&mediaBox, sizeof (CGRect));    CFDictionaryRef pageDictionary = CFDictionaryCreate(NULL, (const void **) myKeys, (const void **) myValues, 1,                                                        &kCFTypeDictionaryKeyCallBacks, & kCFTypeDictionaryValueCallBacks);        // 4.获取pdf绘图上下文    CGContextRef myPDFContext = MyPDFContextCreate (&mediaBox, pathRef);        // 5.开始描绘第一页页面    CGPDFContextBeginPage(myPDFContext, pageDictionary);        //开始画pdf    [self drawViewss:myPDFContext width:myPageWidth height:myPageHeight array:array];        // 绘制title    CGFloat width_0 = [self getStringWidthFontSize:17 string:_Title];    CGRect rect_0 = CGRectMake((myPageWidth - width_0) / 2.0, myPageHeight - _Top / 2.0, width_0, 20);    [self DrawTextWith:myPDFContext string:_Title color:[UIColor blackColor] fontSize:17 rect:rect_0 fontName:CFSTR("Helvetica-Bold")];        // 绘制message_1    CGFloat width_1 = [self getStringWidthFontSize:11 string:_Message_1];    CGRect rect_1 = CGRectMake(myPageWidth - width_1, myPageHeight - 30, width_1, 20);    [self DrawTextWith:myPDFContext string:_Message_1 color:[UIColor grayColor] fontSize:11 rect:rect_1 fontName:CFSTR("Helvetica")];        // 绘制message_2    CGFloat width_2 = [self getStringWidthFontSize:13 string:_Message_2];    CGRect rect_2 = CGRectMake((myPageWidth - width_2) / 2.0, myPageHeight - (_Top - 10), width_2, 20);    [self DrawTextWith:myPDFContext string:_Message_2 color:[UIColor blackColor] fontSize:13 rect:rect_2 fontName:CFSTR("Helvetica")];    CGPDFContextEndPage(myPDFContext);        // 8.释放创建的对象    CFRelease(pageDictionary);    CFRelease(myValues[0]);    CGContextRelease(myPDFContext);}- (void)DrawTextWith:(CGContextRef)context string:(NSString *)string color:(UIColor *)color fontSize:(NSInteger)fontSize rect:(CGRect)rect fontName:(CFStringRef)fontName {        CTFontRef ctfont = CTFontCreateWithName(fontName, fontSize, NULL);    //CTFontRef ctfont = CTFontCreateWithName(CFSTR("STHeitiSC-Medium"), fontSize, NULL);    CGColorRef ctColor = [color CGColor];        // Create an attributed string    CFStringRef keys[] = { kCTFontAttributeName,kCTForegroundColorAttributeName };    CFTypeRef values[] = { ctfont,ctColor};    CFDictionaryRef attr = CFDictionaryCreate(NULL, (const void **)&keys, (const void **)&values,                                              sizeof(keys) / sizeof(keys[0]), &kCFTypeDictionaryKeyCallBacks, &kCFTypeDictionaryValueCallBacks);            CFStringRef ctStr = CFStringCreateWithCString(nil, [string UTF8String], kCFStringEncodingUTF8);    CFAttributedStringRef attrString = CFAttributedStringCreate(NULL,ctStr, attr);    CTLineRef line = CTLineCreateWithAttributedString(attrString);    CGContextSetTextMatrix(context, CGAffineTransformIdentity);    CGContextSetTextPosition(context, rect.origin.x, rect.origin.y);    CTLineDraw(line, context);        CFRelease(line);    CFRelease(attrString);    CFRelease(ctStr);        // Clean up    CFRelease(attr);    CFRelease(ctfont);}//获取字符串宽度-(CGFloat)getStringWidthFontSize:(NSInteger)sizeFont string:(NSString *)string {    CGRect rect = [string boundingRectWithSize:CGSizeMake(MAXFLOAT, 14) options:NSStringDrawingTruncatesLastVisibleLine | NSStringDrawingUsesFontLeading | NSStringDrawingUsesLineFragmentOrigin attributes:@{NSFontAttributeName:[UIFont boldSystemFontOfSize:sizeFont]} context:nil];    return rect.size.width + 5;}- (void)drawViewss:(CGContextRef)context width:(CGFloat)view_w height:(CGFloat)view_h array:(NSArray *)array {        // 最大值    CGFloat max = 1200;    // 一行中波形绘制的范围（高度）    CGFloat height = _CellHeight;    // 每行有多少个点    CGFloat pointCount = _CellPointCount;    // 每行之间两个点的间距    CGFloat gap = view_w / pointCount;        // 行间距    NSInteger cellGap = _CellGap;            CGFloat left = _Left;    CGFloat right = _Right;    CGFloat top = _Top;            // 绘制网格    CGFloat k = _GridWidth;        // 横线    NSInteger cellCount = ceilf(array.count / pointCount);        NSInteger hei = cellCount * height + (cellCount + 1) * cellGap;    CGFloat start_y = view_h - top;        CGContextSetLineWidth(context, _GridLineWidth);    CGContextSetStrokeColorWithColor(context, [UIColor redColor].CGColor);    for (int i = 0; i <= hei / k; i ++) {                CGContextMoveToPoint(context, left , start_y);        CGContextAddLineToPoint(context, view_w - right, start_y);        CGContextStrokePath(context);                start_y -= k;    }        // 竖线    NSInteger vCount = floorf((view_w - left - right) / k);    for (int i = 0; i <= vCount; i ++) {        CGContextMoveToPoint(context, left + k * i, view_h - top);        CGContextAddLineToPoint(context, left + k * i, start_y + k);        CGContextStrokePath(context);    }            // 绘制波形    CGContextSetLineWidth(context, _LineWidth);    CGContextSetStrokeColorWithColor(context, [UIColor blackColor].CGColor);    NSInteger count = 0;    NSInteger cell = 0;        for (int i = 0; i < array.count - 1; i ++) {                NSInteger k_1 = [array[i] integerValue];        NSInteger k_2 = [array[i + 1] integerValue];                if (k_1 > max) {            k_1 = max;        }        if (k_1 < 0) {            k_1 = 0;        }                if (k_2 > max) {            k_2 = max;        }        if (k_2 < 0) {            k_2 = 0;        }                CGFloat x_1 = left + count * gap;        CGFloat kk = (height - k_1 / 1.0 / max * height);                CGFloat y_1 = view_h - (cell * (height + cellGap) + kk) - top - cellGap;        CGPoint point_1 = CGPointMake(x_1, y_1);                CGFloat x_2 = left + (count + 1) * gap;        CGFloat y_2 = view_h - (cell * (height + cellGap) + (height - k_2 / 1.0 / max * height)) - top - cellGap;        CGPoint point_2 = CGPointMake(x_2, y_2);        CGContextMoveToPoint(context, point_1.x  ,point_1.y);        CGContextAddLineToPoint(context, point_2.x, point_2.y);        CGContextStrokePath(context);                count ++;                ///*        if (x_2 >= view_w - right) {            count = 0;            cell ++;        }        //*/                /*        if (count >= pointCount) {            count = 0;            cell ++;        }        */    }            // 绘制message_3    CGFloat width_3 = [self getStringWidthFontSize:13 string:_Message_3];    CGRect rect_3 = CGRectMake((view_w - width_3), view_h - top - 15, width_3, 20);    [self DrawTextWith:context string:_Message_3 color:[UIColor blackColor] fontSize:13 rect:rect_3 fontName:CFSTR("Helvetica")];        // 绘制message_4    CGFloat width_4 = [self getStringWidthFontSize:13 string:_Message_4];    CGRect rect_4 = CGRectMake((view_w - width_4), start_y + 25, width_4, 20);    [self DrawTextWith:context string:_Message_4 color:[UIColor blackColor] fontSize:13 rect:rect_4 fontName:CFSTR("Helvetica")];    }/* * 获取pdf绘图上下文 * inMediaBox指定pdf页面大小 * path指定pdf文件保存的路径 */CGContextRef MyPDFContextCreate (const CGRect *inMediaBox, CFStringRef path) {    CGContextRef myOutContext = NULL;    CFURLRef url;    CGDataConsumerRef dataConsumer;        url = CFURLCreateWithFileSystemPath (NULL, path, kCFURLPOSIXPathStyle, false);        if (url != NULL) {        dataConsumer = CGDataConsumerCreateWithURL(url);        if (dataConsumer != NULL) {            myOutContext = CGPDFContextCreate (dataConsumer, inMediaBox, NULL);            CGDataConsumerRelease (dataConsumer);        }        CFRelease(url);    }    return myOutContext;}- (void)setFileName:(NSString *)fileName {    _fileName = fileName;}- (void)setTitle:(NSString *)Title {    _Title = Title;}@end

// 3、.h文件

////  CreatePDFImage.h//  Helo////  Created by 杨峰 on 2017/12/25.//  Copyright © 2017年 seedmorn. All rights reserved.//#import <Foundation/Foundation.h>@interface CreatePDFImage : NSObject@property (nonatomic, strong) NSString *Title;@property (nonatomic, strong) NSString *Message_1;@property (nonatomic, strong) NSString *Message_2;@property (nonatomic, strong) NSString *Message_3;@property (nonatomic, strong) NSString *Message_4;@property (nonatomic, strong) NSString *fileName;@property (nonatomic) CGFloat FileWidth;@property (nonatomic) CGFloat CellHeight;@property (nonatomic) CGFloat CellPointCount;@property (nonatomic) CGFloat CellGap;@property (nonatomic) CGFloat Top;@property (nonatomic) CGFloat Left;@property (nonatomic) CGFloat Right;@property (nonatomic) CGFloat GridWidth;@property (nonatomic) CGFloat GridLineWidth;@property (nonatomic) CGFloat LineWidth;- (void)CreatePdfFile:(NSArray *)array;@end

// 3、使用 （EcgArray 是绘制波形图的点）

CreatePDFImage *create = [[CreatePDFImage alloc]init];[create CreatePdfFile:EcgArray];