Question

- (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。图像的位置将显示错误。我该如何解决这个问题？


if context is long:
-----------------------
-contextcontextcontext-
-contextcontextcontext-
-                     - 
-              context-
-              context-
-              context-
-              context-
-              context-
-              context-
-imgcontextcontextcont-
-imgcontextcontextcont-
-----------------------

if context is not long:
-----------------------
-contextcontextcontext-
-contextcontextcontext-
-img                  -
-img                  -
-                     - 
-                     - 
-                     - 
-----------------------

为什么？

{ios coretext}是CGPathAddRect使用错误？

0 个答案: