如何在UIView中绘制具有不同颜色的多个UIBezierPath

Question

我想在UIView中使用不同的笔触和填充颜色绘制多个UIBezierPath。

这是代码

- (void)drawRect:(CGRect)rect {

    context = UIGraphicsGetCurrentContext();

    [[UIColor grayColor] setFill]; 
    [[UIColor greenColor] setStroke];

    UIBezierPath *aPath = [[UIBezierPath alloc] init]; 
    [aPath moveToPoint:CGPointMake(227,34.25)];
    [aPath addLineToPoint:CGPointMake(298.25,34.75)];
    [aPath addLineToPoint:CGPointMake(298.5,82.5)];
    [aPath addLineToPoint:CGPointMake(251,83)];
    [aPath addLineToPoint:CGPointMake(251,67.5)];
    [aPath addLineToPoint:CGPointMake(227.25,66.75)];   
    [aPath closePath]; 
    aPath.lineWidth = 2;
    [aPath fill]; 
    [aPath stroke];

    UIBezierPath *aPath2 = [[UIBezierPath alloc] init];
    [aPath2 moveToPoint:CGPointMake(251.25,90.5)];
    [aPath2 addLineToPoint:CGPointMake(250.75,83.25)];
    [aPath2 addLineToPoint:CGPointMake(298.5,83)];
    [aPath2 addLineToPoint:CGPointMake(298.5,90.25)];
    [aPath2 closePath];
    aPath2.lineWidth = 2;
    [aPath2 fill]; 
    [aPath2 stroke];
    [paths addObject:aPath2];

问题是笔划和填充颜色是在当前上下文中设置的。是否可以在同一CGContextRef中绘制不同颜色的不同UIBezierPath？

或者我必须在单独的UIView中绘制每个UIBezierPath？

Answer 1

你应该添加

[desiredStrokeColor setStroke];
[desiredFillColor setFill];

表明这些是在此上下文中必须进一步使用的新颜色。你应该在每次打电话之前这样做

[aNewPath fill];
[aNewPath stroke];

以便用这些颜色绘制路径。

无需为每个贝塞尔曲线路径使用新视图。

Answer 2

用这个

int count = 0;
for(UIBezierpath *_paths in pathArray)
{
   UIColor *_color = [delegate1.colorArray objectAtIndex:q];
   [_color setStroke];
   [_path strokeWithBlendMode:kCGBlendModeNormal alpha:1.0]; 
   count++;
}

触摸开始将您的路径和颜色存储在两个数组中，并像上面一样使用它们。

Answer 3

只需定义一个UIColor * setStroke;在.h文件中并在调用[myPath strokeWithBlendMode:kCGBlendModeNormal alpha:1.0]; 之前设置此strokeColor对象

 - (void)drawRect:(CGRect)rect
    {
        [strokeColor setStroke]; // this method will choose the color from the receiver color object (in this case this object is :strokeColor)
        for(UIBezierPath *_path in pathArray)
            [myPath strokeWithBlendMode:kCGBlendModeNormal alpha:1.0];
    }

    #pragma mark - Touch Methods
    -(void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
    {
        myPath=[[UIBezierPath alloc]init];
        myPath.lineWidth = currentSliderValue;

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

    }