如何在iPhone上使用Quartz显示文本？ [英] How to display text using Quartz on the iPhone?

问题描述

我一直在尝试使用Quartz上下文显示文本，但无论我尝试过什么，我根本没有运气得到显示的文本（我可以显示各种其他Quartz对象）。任何人都知道我可能做错了什么？

I've been trying to display text using a Quartz context, but no matter what I've tried I simply haven't had luck getting the text to display (I'm able to display all sorts of other Quartz objects though). Anybody knows what I might be doing wrong?

例如：

-(void)drawRect:(CGRect)rect
{   
  // Drawing code
  CGContextRef  context = UIGraphicsGetCurrentContext();
  CGContextSelectFont(context, "Arial", 24, kCGEncodingFontSpecific);
  CGContextSetTextPosition(context,80,80);
  CGContextShowText(context, "hello", 6);
  //not even this works
  CGContextShowTextAtPoint(context, 1,1, "hello", 6);
}    

推荐答案

UIColor *mainTextColor = [UIColor whiteColor];
[mainTextColor set];
drawTextLjust(@"Sample Text", 8, 50, 185, 18, 16);

和：

static void drawTextLjust(NSString* text, CGFloat y, CGFloat left, CGFloat right,
                          int maxFontSize, int minFontSize) {
    CGPoint point = CGPointMake(left, y);
    UIFont *font = [UIFont systemFontOfSize:maxFontSize];
    [text drawAtPoint:point forWidth:right - left withFont:font
       minFontSize:minFontSize actualFontSize:NULL
       lineBreakMode:UILineBreakModeTailTruncation
       baselineAdjustment:UIBaselineAdjustmentAlignBaselines];
}

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