UILabel计算宽度

计算label的宽度

+(CGFloat)getLabelWidth:(NSString *)textString defautWidth:(float)defautWidth defautHeight:(float)defautHeight fontSize:(int)fontSize
{
    CGSize size = CGSizeMake(defautWidth,defautHeight);
    CGSize labelsize;
    
#if __IPHONE_OS_VERSION_MAX_ALLOWED >= __IPHONE_7_0
    NSDictionary * dic = [NSDictionary dictionaryWithObjectsAndKeys:[UIFont systemFontOfSize:fontSize] ,NSFontAttributeName,nil];
    labelsize = [textString boundingRectWithSize:size options:NSStringDrawingUsesLineFragmentOrigin attributes:dic context:nil].size;
    
#else
    labelsize = [textString sizeWithFont:font constrainedToSize:size lineBreakMode:NSLineBreakByWordWrapping];
#endif
    
    return labelsize.width;
}