目前在学coreText绘制，为什么绘制的区域的背景色是黑色，怎么设置背景色？

来源：互联网发布：云计算搭建 openstack 编辑：程序博客网时间：2024/04/30 05:50

目前在学coreText绘制，为什么绘制的区域的背景色是黑色？
尝试很多方法都没法改变绘制区的背景色，求指点。

#import "TXTCView.h"

@implementation TXTCView

- (void)drawRect:(CGRect)rect
{
    [super drawRect:rect];
    self.backgroundColor = [UIColor whiteColor];

    CGContextRef context = UIGraphicsGetCurrentContext();
    CGMutablePathRef path = CGPathCreateMutable();//1
    CGPathAddRect(path, NULL, self.bounds);

    NSAttributedString * attString = [[NSAttributedString alloc] initWithString:@"Hello core text World!!"];

    CTFramesetterRef framesetter = CTFramesetterCreateWithAttributedString((CFAttributedStringRef)attString);
    CTFrameRef frame = CTFramesetterCreateFrame(framesetter, CFRangeMake(0, [attString length]), path, NULL);
    CTFrameDraw(frame, context);//4

    CFRelease(frame);//5
    CFRelease(path);
    CFRelease(framesetter);
}

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