iphone - 如何平滑 iPhone 的标记笔划？

Question

嗨，我正在开发一个应用程序，我必须在其中画一些东西。当我用标记描边绘制时，它会产生一些边缘，我如何才能避免这些边缘？

标记笔划代码

- (void)drawRect:(CGRect)rect
{
//    KidsPhotoBookAppDelegate *appDelegate = (KidsPhotoBookAppDelegate*)[[UIApplication sharedApplication]delegate];
//    brushPattern = (UIColor*)appDelegate.kidsSelectedColor;

    DBManager *dbMgr = [DBManager sharedManager];
    [dbMgr.c setStroke];
    for (UIBezierPath *_path in pathArray) 
        [_path strokeWithBlendMode:kCGBlendModeNormal alpha:1.0];  
}

-(void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{
    KidsPhotoBookAppDelegate *appDelegate = (KidsPhotoBookAppDelegate*)[[UIApplication sharedApplication]delegate];

    myPath=[[UIBezierPath alloc]init];
    myPath.lineWidth = appDelegate.kidsBrushSize;
    myPath.lineCapStyle = kCGLineCapRound;
    brushPattern=appDelegate.kidsSelectedColor;
    UITouch *mytouch=[[touches allObjects] objectAtIndex:0];
    [myPath moveToPoint:[mytouch locationInView:self]];
    [pathArray addObject:myPath];

    appDelegate.viewContainsDrawing = YES;
}

-(void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event
{
    UITouch *mytouch=[[touches allObjects] objectAtIndex:0];
    [myPath addLineToPoint:[mytouch locationInView:self]];

    [self setNeedsDisplay];
}

Answer 1

您应该将行连接设置为 kCGLineJoinRound使用CGContextSetLineJoin功能。请参阅Quartz 2D Guide 了解更多。

更新

由于您正在使用UIBezierPath ，您应该尝试设置 lineJoinStyle的UIBezierPath至kCGLineJoinRound .