Question

我在ViewController中有一个ScrollView，在ScrollView上我有一个View。我使用该视图绘制像rect，circle，line，text，... 对于绘图我使用UIBezierPath。问题是当我放大视图（即滚动视图的子视图）时，圆形，直线和矩形都是像素化的。我使用UIScrollViewDelegate方法以这种方式进行缩放：请记住：mapview是scrollview的子视图!!

#pragma mark *** ScrollView Delegate ***

- (void)scrollViewDidScroll:(UIScrollView *)scrollview
{
    [mapview setNeedsDisplay]; // Redraw scrollview content while scrolling
}

-(UIView *)viewForZoomingInScrollView:(UIScrollView *)scrollView
{
    return mapview;
}

-(void)scrollViewDidEndZooming:(UIScrollView *)scrollView withView:(UIView *)view atScale:(float)scale
{
    view.contentScaleFactor =  scale * [UIScreen mainScreen].scale;

}

使用此代码，我获得了这个：

（我现在无法发布图片，因为我的名声不够!!）

矩形不像素化，但圆圈和线条是。我怎么解决？可以在我的情况下使用UIBezierPath吗？我想绘制矢量图形元素（直线，圆形，矩形）并缩放视图，在这些视图中绘制这些对象而不像素化！

我的DrawRect实现：

if ([type isEqualToString:@"rect"])
        {
            MAPRect *rect = [[MAPRect alloc]init];
            rect.bounds = [self getBoundsForElement:properties];
            UIBezierPath *rectPath = [rect bezierPathForDrawing];
            if (![[properties valueForKey:@"strokeColor"] isEqual:@"NSCalibratedWhiteColorSpace 0 1"])
            {
                CIColor *coreColor = [CIColor colorWithString:[properties valueForKey:@"strokeColor"]]; //representation: r0.539924 g0.611259 b1.000000 a1.000000
                UIColor *color = [UIColor colorWithCIColor:coreColor];
                [rect setStrokeColor:color];
                [[rect strokeColor] set];
            }
            else
            {
                CIColor *coreColor = [CIColor colorWithString:[properties valueForKey:@"strokeColor"]];

                [[UIColor colorWithCIColor:coreColor] set];
            }
            [rectPath stroke];
            if (![[properties valueForKey:@"fillColor"] isEqual:@"NSCalibratedWhiteColorSpace 1 1"])
            {
                CIColor *coreColor = [CIColor colorWithString:[properties valueForKey:@"fillColor"]]; //representation: r0.539924 g0.611259 b1.000000 a1.000000
                UIColor *color = [UIColor colorWithCIColor:coreColor];
                [rect setFillColor:color];
                [[rect fillColor] set];
                [rectPath fill];
            }
        }

        else if ([type isEqualToString:@"circle"])
        {
            MAPCircle *circle = [[MAPCircle alloc]init];
            //circle.bounds = [self getBoundsForElement:properties];
            circle.bounds = CGRectInset([self getBoundsForElement:properties], 5.0, 5.0);
            UIBezierPath *circlePath = [circle bezierPathForDrawing];


            if (![[properties valueForKey:@"strokeColor"] isEqual:@"NSCalibratedWhiteColorSpace 0 1"])
            {
                CIColor *coreColor = [CIColor colorWithString:[properties valueForKey:@"strokeColor"]]; //representation: r0.539924 g0.611259 b1.000000 a1.000000
                UIColor *color = [UIColor colorWithCIColor:coreColor];
                [circle setStrokeColor:color];
                [[circle strokeColor] set];
            }
            else
            {
                CIColor *coreColor = [CIColor colorWithString:[properties valueForKey:@"strokeColor"]];

                [[UIColor colorWithCIColor:coreColor] set];
            }
            [circlePath stroke];
            if (![[properties valueForKey:@"fillColor"] isEqual:@"NSCalibratedWhiteColorSpace 1 1"])
            {
                CIColor *coreColor = [CIColor colorWithString:[properties valueForKey:@"fillColor"]]; //representation: r0.539924 g0.611259 b1.000000 a1.000000
                UIColor *color = [UIColor colorWithCIColor:coreColor];
                [circle setFillColor:color];
                [[circle fillColor] set];
                [circlePath fill];
            }

        }

        else if ([type isEqualToString:@"line"])
        {
            MAPLine *line = [[MAPLine alloc]init];
            line.bounds = [self getBoundsForElement:properties];
            UIBezierPath *linePath = [line bezierPathForDrawing];
            if (![[properties valueForKey:@"strokeColor"] isEqual:@"NSCalibratedWhiteColorSpace 0 1"])
            {
                CIColor *coreColor = [CIColor colorWithString:[properties valueForKey:@"strokeColor"]]; //representation: r0.539924 g0.611259 b1.000000 a1.000000
                UIColor *color = [UIColor colorWithCIColor:coreColor];
                [line setStrokeColor:color];
                [[line strokeColor] set];
            }
            else
            {
                CIColor *coreColor = [CIColor colorWithString:[properties valueForKey:@"strokeColor"]];

                [[UIColor colorWithCIColor:coreColor] set];
            }
            [linePath stroke];
        }

        else if ([type isEqualToString:@"text"])
        {
            MAPText *text = [[MAPText alloc]init];
            text.bounds = [self getBoundsForElement:properties];
            UILabel *textfield = [text getTextField];
            [textfield setText:[properties valueForKey:@"textContent"]];
            [textfield sizeToFit];
            if (self.subviews.count == j)
            {
                [self addSubview:textfield];
            }

            j ++;

        }

其中MAPRECT，MAPCIRCLE，MAPLINE，MAPTEXT是我用于实现元素绘制的类，例如MAPCIRCLE类是这样的：

#import "MAPCircle.h"

@implementation MAPCircle

- (UIBezierPath *)bezierPathForDrawing
{

    UIBezierPath *path = [UIBezierPath bezierPathWithOvalInRect:[self bounds]];
    [path setLineWidth:[self strokeWidth]];
    return path;

}

@end

块引用

UIBezierPath在可缩放的视图中没有像素化

0 个答案: