我在 SO 上找到了这个代码,它可以帮助我在 UILabel 中有一个字母间距,这是代码:
- (void) drawRect:(CGRect)rect
{
// Drawing code
CGContextRef context = UIGraphicsGetCurrentContext();
CGContextSelectFont (context, [self.font.fontName cStringUsingEncoding:NSASCIIStringEncoding], self.font.pointSize, kCGEncodingMacRoman);
CGContextSetCharacterSpacing(context, 2);
CGContextSetFillColorWithColor(context, [[UIColor clearColor] CGColor]);
CGAffineTransform myTextTransform = CGAffineTransformScale(CGAffineTransformIdentity, 1.f, -1.f );
CGContextSetTextMatrix (context, myTextTransform);
// draw 1 but invisbly to get the string length.
CGPoint p =CGContextGetTextPosition(context);
float centeredY = (self.font.pointSize + (self.frame.size.height- self.font.pointSize)/2)-2;
CGContextShowTextAtPoint(context, 0, centeredY, [self.text cStringUsingEncoding:NSASCIIStringEncoding], [self.text length]);
CGPoint v =CGContextGetTextPosition(context);
// calculate width and draw second one.
float width = v.x - p.x;
float destX = 0;
// calculate X position based on alignment
if([self textAlignment] == UITextAlignmentLeft){
destX = 0;
}else if([self textAlignment] == UITextAlignmentCenter){
destX = (self.frame.size.width- width)/2;
}else if([self textAlignment] == UITextAlignmentRight){
destX = self.frame.size.width - width;
}
CGContextSetFillColorWithColor(context, [self.textColor CGColor]);
CGContextShowTextAtPoint(context, destX, centeredY, [self.text cStringUsingEncoding:NSASCIIStringEncoding], [self.text length]);
}
问题是对于像èàòé 这样的重音字母,uilabel 是空的,我该如何解决这个问题?