0 
- (void)drawRect:(CGRect)rect
{
    // Drawing code

    [super drawRect:rect];

    /* Get the graphics context for drawing */
    CGContextRef context = UIGraphicsGetCurrentContext();

    //    NSMutableAttributedString * attrString = [[NSMutableAttributedString alloc] initWithString:@"this is a very very long context.this is a very very long context.this is a very very long context.this is a very very long context.this is a very very long context.this is a very very long context.this is a very very long context.this is a very very long context.this is a very very long context.this is a very very long context.this is a very very long context.this is a very very long context.this is a very very long context.this is a very very long context.this is a very very long context.this is a very very long context.this is a very very long context.this is a very very long context.this is a very very long context."];


    NSMutableAttributedString * attrString = [[NSMutableAttributedString alloc] initWithString:@"this is a very very long context.this is a very very long context.this is a very very long context.this is a very very long context.."];


    CTFramesetterRef frameSetter = CTFramesetterCreateWithAttributedString((__bridge CFAttributedStringRef)attrString);
    CGMutablePathRef path = CGPathCreateMutable();
    CFRange fitRange;
    CGSize size = CTFramesetterSuggestFrameSizeWithConstraints(frameSetter,CFRangeMake(0, attrString.length),NULL,self.bounds.size,&fitRange);

    NSLog(@"attrString.length = %d",attrString.length);
    NSLog(@"fitRange: location = %ld,length = %ld",fitRange.location,fitRange.length);
    NSLog(@"size = %@",NSStringFromCGSize(size));

    CGPathAddRect(path, NULL, rect);

    CGRect imgBounds = CGRectMake(0, size.height, 236, 308);
    CGPathAddRect(path, NULL, imgBounds);
    NSLog(@"imgBounds:%@",NSStringFromCGRect(imgBounds));
    CGContextDrawPath(context,kCGPathFill);

    UIImage *image = [UIImage imageNamed:@"aaa.jpg"];
    CGContextDrawImage(context, imgBounds, image.CGImage);
    CTFrameRef frame = CTFramesetterCreateFrame(frameSetter, CFRangeMake(0, attrString.length), path, NULL);

    /* Core Text Coordinate System is OSX style */
    CGContextSetTextMatrix(context, CGAffineTransformIdentity);
    CGContextTranslateCTM(context, 0, self.bounds.size.height);
    CGContextScaleCTM(context, 1.0, -1.0);

    CTFrameDraw(frame, context);

}

如果 attrString 太长。图片的位置会显示错误。我怎样才能解决这个问题？

如果上下文很长：
----------------------
-上下文上下文上下文-
-上下文上下文上下文-
- -
- 语境-
- 语境-
- 语境-
- 语境-
- 语境-
- 语境-
-imgcontextcontextcont-
-imgcontextcontextcont-
----------------------

如果上下文不长：
----------------------
-上下文上下文上下文-
-上下文上下文上下文-
-img-
-img-
- -
- -
- -
----------------------

为什么 ？

4

0 回答 0