1.
CGSize titleSize = [str boundingRectWithSize:CGSizeMake(245.0, MAXFLOAT) options:NSStringDrawingUsesLineFragmentOrigin attributes:@{NSFontAttributeName:[UIFont systemFontOfSize:13]} context:nil].size;
2.
// screenWidth
CGFloat screenWidth = [UIScreen mainScreen].bounds.size.width;
CGRect tempFrame =
[_title boundingRectWithSize:CGSizeMake(screenWidth - LABEL_MARGIN * 2, CGFLOAT_MAX)
options:NSStringDrawingUsesLineFragmentOrigin
attributes:@{NSFontAttributeName:TITLE_FONT}
context:nil];