iOS 计算label的宽度和高度

//根据宽度求高度  content 计算的内容  width 计算的宽度 font字体大小
+ (CGFloat)getLabelHeightWithText:(NSString *)text width:(CGFloat)width font: (CGFloat)font
{
    CGRect rect = [text boundingRectWithSize:CGSizeMake(width, MAXFLOAT) options:NSStringDrawingUsesLineFragmentOrigin attributes:@{NSFontAttributeName:[UIFont ZKYLTFont:font]} context:nil];
    
    return rect.size.height;
}
//根据高度度求宽度  text 计算的内容  Height 计算的高度 font字体大小
+ (CGFloat)getWidthWithText:(NSString *)text height:(CGFloat)height font:(CGFloat)font{
    
    CGRect rect = [text boundingRectWithSize:CGSizeMake(MAXFLOAT, height)
                                        options:NSStringDrawingUsesLineFragmentOrigin
                                     attributes:@{NSFontAttributeName:[UIFont systemFontOfSize:font]}
                                        context:nil];
    return rect.size.width;
}