关于UILabel自适应宽度高度

label自适应宽度

CGSize labelSize=[label.text                     sizeWithAttributes:@{NSFontAttributeName: [UIFont    systemFontOfSize:fontOfLab]}];

label.font = [UIFont systemFontOfSize:fontOfLab];

label 自适应高度

CGSize labelSize = [self.lab.text sizeWithFont:self.lab.font constrainedToSize:size lineBreakMode:NSLineBreakByClipping];

这种方法虽然可以用  但是官网已经建议我们使用下面那种来代替了 哎  现在才发现

//自动折行设置
    label.lineBreakMode =  UILineBreakModeWordWrap ;
    label.numberOfLines = 0;

    //自适应高度
    CGRect txtFrame = label.frame;

    label.frame = CGRectMake(10, 100, 300,
                             txtFrame.size.height =[label.text boundingRectWithSize:
                                                    CGSizeMake(txtFrame.size.width, CGFLOAT_MAX)
                                                                            options: NSStringDrawingUsesLineFragmentOrigin  |  NSStringDrawingUsesFontLeading
                                                                         attributes:[ NSDictionary  dictionaryWithObjectsAndKeys:label.font, NSFontAttributeName ,  nil ] context: nil ].size.height);
    label.frame = CGRectMake(10, 100, 300, txtFrame.size.height);

    [ self .view addSubview:label];