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(, , PP_SCREEN_WIDTH, )];
     _piker.delegate = self;
     [self.view addSubview:_piker];

 }

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

     // 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) , , , ));
     }];

 }

 #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);
 }