废话不多说，直接上代码。代码直接黏贴可用，自定义画板View。
//
// MMGraphicView.h
// yuxi-manager
//
// Created by Sven on 2017/6/28.
// Copyright © 2017年 ylink. All rights reserved.
//
import <UIKit/UIKit.h>
// 画布
typedef void(^returnSignPhotoBlock)(UIImage * img);
@interface MMGraphicView : UIView
{
CGPoint _start;
CGPoint _move;
CGMutablePathRef _path;
NSMutableArray _pathArray;
CGFloat _lineWidth;
UIColor _color;
}
@property (nonatomic,assign)CGFloat lineWidth;/< 线宽 /
@property (nonatomic,strong)UIColor color;/< 线的颜色 */
@property (nonatomic,strong)NSMutableArray pathArray;
@property(nonatomic,copy)returnSignPhotoBlock block;
-(UIImage)getDrawingImg;
@end
//
// MMGraphicView.m
// yuxi-manager
//
// Created by Sven on 2017/6/28.
// Copyright © 2017年 ylink. All rights reserved.
//
import "MMGraphicView.h"
@implementation MMGraphicView
(UIViewController )viewController
{
for (UIView next = [self superview]; next; next = next.superview) {
UIResponder *nextResponder = [next nextResponder];
if ([nextResponder isKindOfClass:[UIViewController class]]) {
return (UIViewController *)nextResponder;
}
}
return nil;
}-
(instancetype)initWithFrame:(CGRect)frame {
if (self = [super initWithFrame:frame]) {
_move = CGPointMake(0, 0);
_start = CGPointMake(0, 0);
_lineWidth = 2;
_color = [UIColor redColor];
_pathArray = [NSMutableArray array];//创建保存功能 UIButton *but = [UIButton buttonWithType:UIButtonTypeSystem]; but.frame = CGRectMake(0, self.bounds.size.height-60, 100, 60); [but setTitle:@"保存签名" forState:UIControlStateNormal]; [but addTarget:self action:@selector(savePhoto) forControlEvents:UIControlEventTouchUpInside]; [self addSubview:but]; UIButton *undoBtn = [UIButton buttonWithType:UIButtonTypeSystem]; undoBtn.frame = CGRectMake(110, self.bounds.size.height-60, 100, 60); [undoBtn setTitle:@"撤销" forState:UIControlStateNormal]; [undoBtn addTarget:self action:@selector(undoBtnEvent) forControlEvents:UIControlEventTouchUpInside]; [self addSubview:undoBtn]; UIButton *clearBtn = [UIButton buttonWithType:UIButtonTypeSystem]; clearBtn.frame = CGRectMake(220, self.bounds.size.height-60, 100, 60); [clearBtn setTitle:@"清除啊" forState:UIControlStateNormal]; [clearBtn addTarget:self action:@selector(clearBtnEvent) forControlEvents:UIControlEventTouchUpInside]; [self addSubview:clearBtn]; UIButton * backBtn = [UIButton buttonWithType:UIButtonTypeCustom]; backBtn.frame = CGRectMake(330, self.bounds.size.height-60, 100, 60); [backBtn addTarget:self action:@selector(back) forControlEvents:UIControlEventTouchUpInside]; [backBtn setTitle:@"返回" forState:UIControlStateNormal]; [backBtn setTitleColor:[UIColor redColor] forState:UIControlStateNormal]; [self addSubview:backBtn];} return self;}
-(void)back{
[[self viewController].navigationController popViewControllerAnimated:YES];}
- (void)drawRect:(CGRect)rect {
// 获取图形上下文
CGContextRef context = UIGraphicsGetCurrentContext();
[self drawPicture:context]; //画图
}
- (void)drawPicture:(CGContextRef)context {
for (NSArray * attribute in _pathArray) {
//将路径添加到上下文中
CGPathRef pathRef = (__bridge CGPathRef)(attribute[0]);
CGContextAddPath(context, pathRef);
//设置上下文属性
[attribute[1] setStroke];
CGContextSetLineWidth(context, [attribute[2] floatValue]);
//绘制线条
CGContextDrawPath(context, kCGPathStroke);
}
}
- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {
UITouch *touch = [touches anyObject];
_path = CGPathCreateMutable(); //创建路径
NSArray *attributeArry = @[(__bridge id)(_path),_color,[NSNumber numberWithFloat:_lineWidth]];
[_pathArray addObject:attributeArry]; //路径及属性数组数组
_start = [touch locationInView:self]; //起始点
CGPathMoveToPoint(_path, NULL,_start.x, _start.y);}
- (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event {
// 释放路径
CGPathRelease(_path);}
- (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event {
UITouch *touch = [touches anyObject];
_move = [touch locationInView:self];
//将点添加到路径上
CGPathAddLineToPoint(_path, NULL, _move.x, _move.y);
[self setNeedsDisplay];
}
pragma mark --点击事件--
- (void)savePhoto {
if (_pathArray.count) {
UIGraphicsBeginImageContext(self.frame.size);
CGContextRef context = UIGraphicsGetCurrentContext();
UIRectClip(CGRectMake(0, 0, self.frame.size.width, self.frame.size.height-100));
[self.layer renderInContext:context];
UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
// UIImageWriteToSavedPhotosAlbum(image, self, nil, NULL);
UIImageWriteToSavedPhotosAlbum(image, self, @selector(image:didFinishSavingWithError:contextInfo:), NULL);
self.block(image);
}
else{
UIAlertView* alert = [[UIAlertView alloc]initWithTitle:@"alert" message:@"请您先绘制图形" delegate:nil cancelButtonTitle:nil otherButtonTitles:@"确定", nil];
[alert show];
}}
- (void)image: (UIImage *) image didFinishSavingWithError: (NSError *) error contextInfo: (NSString *)str{
NSString *msg = nil ;
if(error != NULL){
msg = @"保存图片失败" ;
}else{
msg = @"保存图片成功" ;
}
UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"保存图片结果提示"
message:msg
delegate:self
cancelButtonTitle:@"确定"
otherButtonTitles:nil];
[alert show];
}
-(UIImage *)getDrawingImg{
if (_pathArray.count) {
UIGraphicsBeginImageContext(self.frame.size);
CGContextRef context = UIGraphicsGetCurrentContext();
UIRectClip(CGRectMake(0, 0, self.frame.size.width, self.frame.size.height));
[self.layer renderInContext:context];
UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
return image;
}
UIAlertView* alert = [[UIAlertView alloc]initWithTitle:@"alert" message:@"请您先绘制图形" delegate:nil cancelButtonTitle:nil otherButtonTitles:@"确定", nil];
[alert show];
return nil;}
-(void)undoBtnEvent
{
[_pathArray removeLastObject];
[self setNeedsDisplay];
}
-(void)clearBtnEvent
{
[_pathArray removeAllObjects];
[self setNeedsDisplay];
}
@end
