高さを保ったまま、横に絞りたいということですか?これは、通常の幅の約 60% まで達成可能です。それを超えて、それはひどいように見えます。
これは、必要に応じていずれかの軸を独立してスクイーズする UILabel サブクラスの drawRect です。
// This drawRect for a UILabel subclass reproduces most common UILabel formatting, but does not do truncation, line breaks, or scaling to fit.
// Instead, it identifies cases where the label text is too large on either axis, and shrinks along that axis.
// For small adjustments, this can keep text readable. In extreme cases, it will create an ugly opaque block.
- (void) drawRect:(CGRect)rect;
{
CGRect bounds = [self bounds];
NSString *text = [self text];
UIFont *font = [self font];
// Find the space needed for all the text.
CGSize textSize = [text sizeWithFont:font];
// topLeft is the point from which the text will be drawn. It may have to move due to compensate for scaling, or due to the chosen alignment.
CGPoint topLeft = bounds.origin;
// Default to no scaling.
CGFloat scaleX = 1.0;
CGFloat scaleY = 1.0;
// If the text is too wide for its space, reduce it.
// Remove the second half of this AND statement to have text scale WIDER than normal to fill the space. Useless in most cases, but can be amusing.
if ((textSize.width>0) && (bounds.size.width/textSize.width<1))
{
scaleX = bounds.size.width/textSize.width;
topLeft.x /= scaleX;
}
else
{
// Alignment only matters if the label text doesn't already fill the space available.
switch ([self textAlignment])
{
case UITextAlignmentLeft :
{
topLeft.x = bounds.origin.x;
}
break;
case UITextAlignmentCenter :
{
topLeft.x = bounds.origin.x+(bounds.size.width-textSize.width)/2;
}
break;
case UITextAlignmentRight :
{
topLeft.x = bounds.origin.x+bounds.size.width-textSize.width;
}
break;
}
}
// Also adjust the height if necessary.
if ((textSize.height>0) && (bounds.size.height/textSize.height<1))
{
scaleY = bounds.size.height/textSize.height;
topLeft.y /= scaleY;
}
else
{
// If the label does not fill the height, center it vertically.
// A common feature request is for labels that do top or bottom alignment. If this is needed, add a property for vertical alignment, and obey it here.
topLeft.y = bounds.origin.y+(bounds.size.height-textSize.height)/2;
}
// Having calculated the transformations needed, apply them here.
// All drawing that follows will be scaled.
CGContextRef context = UIGraphicsGetCurrentContext();
CGContextScaleCTM(context, scaleX, scaleY);
// Begin drawing.
// UILabels may have a shadow.
if ([self shadowColor])
{
[[self shadowColor] set];
CGPoint shadowTopLeft = CGPointMake(topLeft.x+[self shadowOffset].width/scaleX, topLeft.y+[self shadowOffset].height/scaleY);
[text drawAtPoint:shadowTopLeft withFont:font];
}
// The text color may change with highlighting.
UIColor *currentTextColor;
if ((![self isHighlighted]) || (![self highlightedTextColor]))
currentTextColor = [self textColor];
else
currentTextColor = [self highlightedTextColor];
// Finally, draw the regular text.
if (currentTextColor)
{
[currentTextColor set];
[text drawAtPoint:topLeft withFont:font];
}
}