有行间距的文本高度计算

- (CGSize)boundingRectWithSize:(CGSize)size WithStr:(NSString*)string andFont:(UIFont*)font andLinespace:(CGFloat)space

{

NSMutableParagraphStyle*style = [[NSMutableParagraphStyle alloc]init];

[style setLineSpacing:space];

NSDictionary*attribute =@{NSFontAttributeName:font,NSParagraphStyleAttributeName:style};

CGSize retSize = [string boundingRectWithSize:size

options:\

NSStringDrawingTruncatesLastVisibleLine|

NSStringDrawingUsesLineFragmentOrigin|

NSStringDrawingUsesFontLeading

attributes:attribute

context:nil].size;

return retSize;

}