iOS开发之自定义画板

　　今天整好有时间, 写了一个自定义的画板!  [我的github]

GLPaint主要采用QuartzCore框架, 对画布上的元素进行渲染, 然后通过UIImageWriteToSavedPhotosAlbum保存到相册.

代码耦合性比较低, 集成比较简单, 初学者可以了解一下.

1. 在ViewController中只需要实现这几个方法基本就没问题了;

#pragma mark - 创建colorPiker
- (void)setupColorPiker
{
    _piker = [ColorPicker colorPickerWithFrame:CGRectMake(0, 64, PP_SCREEN_WIDTH, 130)];
    _piker.delegate = self;
    [self.view addSubview:_piker];
    
}


#pragma mark - 创建PaintView
- (void)setupPaintView
{
    _paintView = [PaintView paintView];
    _paintView.backgroundColor = [UIColor colorWithWhite:0.9 alpha:.95];

    // 设置线宽
    _paintView.lineWidth = 8.0f;
    [self.view addSubview:_paintView];
    
    // 约束
    [_paintView mas_makeConstraints:^(MASConstraintMaker *make) {
        make.edges.equalTo(self.view).insets(UIEdgeInsetsMake(CGRectGetMaxY(_piker.frame) , 5, 0, 5));
    }];
    
}


#pragma mark - ColorPickerDelegate
- (void)aColorPickerDidSelected:(UIColor *)color
{
    [_paintView setPaintColor:color];
    
}

2. 保存到相册

#pragma mark - 保存图片到相册
// 监听点击
- (void)saveImage
{
    // 获取照片
    UIImage *paintImage = [_paintView paintImage];
    LogRed(@"%@", paintImage);
    
    UIImageWriteToSavedPhotosAlbum(paintImage, self, @selector(imageSavedToPhotosAlbum:didFinishSavingWithError:contextInfo:), nil);
}

- (void)imageSavedToPhotosAlbum:(UIImage *)image didFinishSavingWithError:(NSError *)error contextInfo:(void *)contextInfo
{
    NSString *message = @"";
    if (!error) {
        message = @"成功保存到相册";
    }else
    {
        message = [error description];
    }
    LogRed(@"message is %@",message);
}