废话不说，直接上代码

 

封装.h

////  SignatureView.h//  Copyright © 2019 dev. All rights reserved.//#import 
     
      @interface SignatureView : UIView/** * 获取签名图片 */- (UIImage *)getSignatureImage;/** * 清除签名 */- (void)clearSignature;@end
     

 

封装.m

////  SignatureView.m//  Copyright © 2019 dev. All rights reserved.//#import "SignatureView.h"@interface SignatureView (){    CGPoint points[5];}@property(nonatomic,assign) NSInteger control;@property(nonatomic,strong) UIBezierPath *beizerPath;@end@implementation SignatureView- (instancetype)initWithFrame:(CGRect)frame{    self = [super initWithFrame:frame];    if (self) {        self.backgroundColor = [UIColor clearColor];        [self setMultipleTouchEnabled:NO];        self.beizerPath = [UIBezierPath bezierPath];        [self.beizerPath setLineWidth:2];    }    return self;}#pragma mark - 绘图操作- (void)drawRect:(CGRect)rect{    //设置签名的颜色    UIColor *strokeColor = [UIColor blackColor];    [strokeColor setStroke];        //签名的路径绘制    [self.beizerPath stroke];}- (void)touchesBegan:(NSSet
     
       *)touches withEvent:(UIEvent *)event{    self.control = 0;    UITouch *touch = [touches anyObject];    points[0] = [touch locationInView:self];    CGPoint startPoint = points[0];    CGPoint endPoint = CGPointMake(startPoint.x + 1.5, startPoint.y + 2);    [self.beizerPath moveToPoint:startPoint];    [self.beizerPath addLineToPoint:endPoint];}- (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event{    UITouch *touch = [touches anyObject];    CGPoint touchPoint = [touch locationInView:self];    _control++;    points[_control] = touchPoint;        if (_control == 4){        points[3] = CGPointMake((points[2].x + points[4].x)/2.0, (points[2].y + points[4].y)/2.0);                //设置画笔起始点        [self.beizerPath moveToPoint:points[0]];                //endPoint终点 controlPoint1、controlPoint2控制点        [self.beizerPath addCurveToPoint:points[3] controlPoint1:points[1] controlPoint2:points[2]];                //setNeedsDisplay会自动调用drawRect方法，这样可以拿到UIGraphicsGetCurrentContext，就可以画画了        [self setNeedsDisplay];                points[0] = points[3];        points[1] = points[4];        _control = 1;    }}#pragma mark - 清除签名- (void)clearSignature{    [self.beizerPath removeAllPoints];    [self setNeedsDisplay];}#pragma mark - 获取图片- (UIImage *)getSignatureImage {    //设置为NO，UIView是透明这里的图片就是透明的    UIGraphicsBeginImageContextWithOptions(self.bounds.size, NO, [UIScreen mainScreen].scale);    [self.layer renderInContext:UIGraphicsGetCurrentContext()];        UIImage *signatureImage = UIGraphicsGetImageFromCurrentImageContext();    UIGraphicsEndImageContext();    NSString* docDir = [NSString stringWithFormat:@"%@/Documents/Image", NSHomeDirectory()];    [[NSFileManager defaultManager] createDirectoryAtPath:docDir withIntermediateDirectories:YES attributes:nil error:nil];    NSString *path = [NSString stringWithFormat:@"%@/Documents/Image/IMAGE.png", NSHomeDirectory()];        //用png是透明的    [UIImagePNGRepresentation(signatureImage) writeToFile: path atomically:YES];//    [UIImageJPEGRepresentation(signatureImage,0.0001) writeToFile: path atomically:YES];//jpeg用这个return signatureImage;}@end
     

 

 

在vc里面使用

例如：

////  SignatureViewController.h//  Copyright © 2019 dev. All rights reserved.//#import 
     
      @interface SignatureViewController : UIViewController@property(nonatomic,strong)CommenModel *contentModel;@end
     

 

 

////  SignatureViewController.m//  Copyright © 2019 dev. All rights reserved.//#import "SignatureViewController.h"#import "SignatureView.h"#define kScreenHeight [UIScreen mainScreen].bounds.size.height#define kScreenWidth [UIScreen mainScreen].bounds.size.width#define YYEncode(str) [str dataUsingEncoding:NSUTF8StringEncoding]#define kBOUNDARY @"abc"@interface SignatureViewController ()@property(nonatomic,strong) SignatureView *signView;@property(nonatomic,strong) UIImageView *imageView;@end@implementation SignatureViewController- (void)viewDidLoad {    [super viewDidLoad];    // Do any additional setup after loading the view.    self.view.backgroundColor = [UIColor whiteColor];        [self addTopNaviBarWithTitle:@"签名"];    //画布    UIView *backView = [[UIView alloc] initWithFrame:CGRectMake(0, SafeAreaTopHeight, kScreenWidth, 200)];    backView.layer.borderWidth = 2;    backView.layer.borderColor = [[UIColor redColor] CGColor];    [self.view addSubview:backView];    self.signView = [[SignatureView alloc] initWithFrame:backView.bounds];    [backView addSubview:self.signView];                UIButton *reSignBtn = [UIButton buttonWithType:UIButtonTypeCustom];    reSignBtn.backgroundColor = NAVIBAR_COLOR_DEFAULT;    [reSignBtn setTitle:@"重签" forState:UIControlStateNormal];    [reSignBtn setFrame:CGRectMake(20, SafeAreaTopHeight+200+10, (self.view.width - 20*3)*0.5, 40)];    reSignBtn.layer.cornerRadius = 5.0;    reSignBtn.clipsToBounds = YES;    reSignBtn.titleLabel.font = [UIFont systemFontOfSize:17];    [reSignBtn addTarget:self action:@selector(clearBtnClick) forControlEvents:UIControlEventTouchUpInside];    [self.view addSubview:reSignBtn];            UIButton *confirmBtn = [UIButton buttonWithType:UIButtonTypeCustom];    [confirmBtn setTitle:@"确认" forState:UIControlStateNormal];    confirmBtn.backgroundColor = NAVIBAR_COLOR_DEFAULT;    confirmBtn.titleLabel.font = [UIFont systemFontOfSize:17.0];    confirmBtn.frame = CGRectMake(CGRectGetMaxX(reSignBtn.frame)+20, reSignBtn.origin.y, reSignBtn.width, reSignBtn.height);    confirmBtn.layer.cornerRadius = 5.0;    confirmBtn.clipsToBounds = YES;    [confirmBtn addTarget:self action:@selector(imageBtnClick) forControlEvents:UIControlEventTouchUpInside];    [self.view addSubview:confirmBtn];        }#pragma mark----导航栏-(void)addTopNaviBarWithTitle:(NSString *)title{    UIView *naviBar = [[UIView alloc]initWithFrame:CGRectMake(0, 0, JX_SCREEN_WIDTH, SafeAreaTopHeight)];    UIColor *naviColor = NAVIBAR_COLOR_DEFAULT;    naviBar.backgroundColor = naviColor;        if(title.length)    {                UILabel *titleLabel = [[UILabel alloc]initWithFrame:CGRectMake(0, 0, JX_SCREEN_WIDTH-40-40, 132.0 / SCALE)];                titleLabel.font = TITLE_FONT_SIZE;        titleLabel.textColor = [UIColor whiteColor];        titleLabel.textAlignment =  IFLY_ALIGN_CENTER;        [titleLabel setCenter:CGPointMake(naviBar.center.x, naviBar.center.y + SCREEN_Y / 2.0)];        [naviBar addSubview:titleLabel];        titleLabel.hidden = NO;        titleLabel.text = title;    }else{            }    UIButton *backBottomBtn = [[UIButton alloc]initWithFrame:CGRectMake(0, SCREEN_Y, 60, 44)];    backBottomBtn.backgroundColor = [UIColor clearColor];    [backBottomBtn addTarget:self action:@selector(goBack) forControlEvents:UIControlEventTouchUpInside];    [naviBar addSubview:backBottomBtn];    UIButton *backButton = [[UIButton alloc]initWithFrame:CGRectMake(36.0 / SCALE,SCREEN_Y+ (44-66.0 / SCALE)/2, 66.0 / SCALE, 66.0 / SCALE)];    [backButton setImage:[UIImage imageNamed:@"Right"] forState:UIControlStateNormal];    [backButton addTarget:self action:@selector(goBack) forControlEvents:UIControlEventTouchUpInside];    [naviBar addSubview:backButton];    [self.view addSubview:naviBar];}-(void)goBack{    [self.navigationController popViewControllerAnimated:YES];}#pragma mark - 清楚图片- (void)clearBtnClick{    [self.signView clearSignature];}#pragma mark - 生成图片- (void)imageBtnClick{    UIImage *image  =  [self.signView getSignatureImage];    //拿到图片做你想做的吧    /********************/}@end