How to calculate NSAttributedString text size - ios

Question

I would like to calculate NSAttributedString text size.
But I couldn't.
```
func getTextSize(viewWidth:CGFloat, padding:CGFloat) -> CGSize {
var size:CGSize = CGSizeZero
if let s:CGSize = self.makeSize(viewWidth) {
size = CGSize(width: s.width, height: s.height + padding)
}
return size
}
// MARK: private
func makeSize(width:CGFloat) -> CGSize? {
var size:CGSize? = nil
if self.respondsToSelector("boundingRectWithSize:options:context:") {
let bounds:CGSize = CGSize(width: width, height: CGFloat.max)
let rect:CGRect = self.boundingRectWithSize(bounds, options:.UsesLineFragmentOrigin, context: nil)
size = CGSize(width: rect.size.width, height: rect.size.height)
}
return size
}
let no_multi_catchcopy = catchcopy!.stringByReplacingOccurrencesOfString("　", withString: " ")
//行間
let attributedText = NSMutableAttributedString(string: no_multi_catchcopy)
let paragraphStyle = NSMutableParagraphStyle()
paragraphStyle.lineSpacing = 5
paragraphStyle.lineBreakMode = NSLineBreakMode.ByTruncatingTail
attributedText.addAttribute(NSParagraphStyleAttributeName, value: paragraphStyle, range: NSMakeRange(0, attributedText.length))
let size = attributedText.getTextSize(self.view.bounds.width, padding: 10)
```
Line spacing was ignored by above way.
This returns same value.
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UIFont is let font = UIFont(name: "HiraKakuProN-W6", size: 14)
By the way,the following code is another way.
+(CGFloat)heightForAttributedString:(NSAttributedString *)attrString forWidth:(CGFloat)inWidth
{
CTTypesetterRef typesetter = CTTypesetterCreateWithAttributedString((CFAttributedStringRef)attrString);
CGFloat width = inWidth;
CFIndex offset = 0, length;
CGFloat y = 0;
do {
length = CTTypesetterSuggestLineBreak(typesetter, offset, width);
CTLineRef line = CTTypesetterCreateLine(typesetter, CFRangeMake(offset, length));
CGFloat ascent, descent, leading;
CTLineGetTypographicBounds(line, &ascent, &descent, &leading);
CFRelease(line);
offset += length;
y += ascent + descent + leading;
} while (offset < [attrString length]);
CFRelease(typesetter);
return ceil(y);
}
Font is japanese system font.
let font = UIFont(name: "HiraKakuProN-W6", size: 14){
But It can return correct height until 2 lines.
If it has 3 lines,method return same value as 2 line.
What is this problem?
Hirakaku is problem?

Answer 1

If You've fix width then you can try this:
NSAttributedString *attributedStr = ... // your attributed string
CGFloat width = 300; // whatever your desired width is
CGRect rect = [attributedStr boundingRectWithSize:CGSizeMake(width, 10000) options:NSStringDrawingUsesLineFragmentOrigin | NSStringDrawingUsesFontLeading context:nil];
Without the proper values for the options parameter, you'll get wrong height.
Also, Without a font, there is no way to properly calculate the size.