涂鸦之贝赛尔

代码如下

@interface JFpaintView ()

@property (nonatomic ,strong)NSMutableArray *totalPathPoints;
@property (nonatomic, strong)NSMutableArray *paths;

@end
@implementation JFpaintView
//清除
-(void)clear{
    [self.paths removeAllObjects];
    [self setNeedsDisplay];

}
//后退
-(void)back{
    [self.paths removeLastObject];
    [self setNeedsDisplay];

}

/**
 *  懒加载
 *
 *  @return 返回一个路径
 */
-(NSMutableArray *)paths{
    if (_paths == nil) {
        _paths = [NSMutableArray array];
    }
    return _paths;
}

-(NSMutableArray *)totalPathPoints{
    if (_totalPathPoints == nil) {
        _totalPathPoints = [NSMutableArray array];
    }return _totalPathPoints;
}
// Only override drawRect: if you perform custom drawing.
// An empty implementation adversely affects performance during animation.
//取出遍历所有路径
- (void)drawRect:(CGRect)rect {
    for (UIBezierPath *path  in self.paths) {
        path.lineWidth = 10;
        [path stroke];
    }

}

/**
*  起点
*
*/
-(void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event{
    //1.获取当前的触摸点
    UITouch *touch =  [touches anyObject];
    CGPoint startPos =  [touch locationInView:touch.view] ;
    //2.创建一个新的路径
    UIBezierPath *currenPath = [UIBezierPath bezierPath];
    线条的类型
    currenPath.lineCapStyle = kCGLineCapRound;
    currenPath.lineJoinStyle = kCGLineJoinRound;

    //3.设置起点
    [currenPath moveToPoint:startPos];

    //4.添加数组到数组中
    [self.paths addObject:currenPath];

    //5.开始展示
    [self setNeedsDisplay];

}
/**
 *  连线
 *
 */
-(void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event{
    UITouch *touch = [touches anyObject];
    CGPoint pos = [touch locationInView:touch.view];

    UIBezierPath *curentPath = [self.paths lastObject];
    [curentPath addLineToPoint:pos];
    [self setNeedsDisplay];

}
/**
 *  连线
 *
 */
-(void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event{
    [self touchesMoved:touches withEvent:event];
}

//截屏
+ (instancetype)captureWithView:(UIView *)view
{
    // 1.开启上下文
    UIGraphicsBeginImageContextWithOptions(view.frame.size, NO, 0.0);

    // 2.将控制器view的layer渲染到上下文
    [view.layer renderInContext:UIGraphicsGetCurrentContext()];

    // 3.取出图片
    UIImage *newImage = UIGraphicsGetImageFromCurrentImageContext();

    // 4.结束上下文
    UIGraphicsEndImageContext();

    return newImage;
}
@end

//保存到相册

- (IBAction)save {
    //截屏
    UIImage *image = [UIImage captureWithView:self.JFView];

    //保存到相册
    UIImageWriteToSavedPhotosAlbum(image, self, @selector(image:didFinishSavingWithError:contextInfo:), nil);
}
- (void)image:(UIImage *)image didFinishSavingWithError:(NSError *)error contextInfo:(void *)contextInfo{
    if (error) {//保存失败
        [MBProgressHUD showError:@"保存失败"];
    }else{//保存成功
        [MBProgressHUD showSuccess:@"保存成功"];
    }

}

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