label 宽高自适应

//昵称根据文字字数动态确定Label宽高

    _nameLabel = [[UILabelalloc]init];

    _nameLabel.text =self.nickStr;

    UIFont* ft = [UIFontfontWithName:@"HelveticaNeue"size:18.0f];

    _nameLabel.font =ft;

    CGSize size = [_nameLabel.textsizeWithAttributes:[NSDictionarydictionaryWithObjectsAndKeys:ft,NSFontAttributeName,nil]];

    CGFloat nameH = size.height;

    CGFloat nameW = size.width;

    _nameLabel.frame =CGRectMake(_headImageV.right +10, _headImageV.top +5,nameW, nameH);

[mainView addSubview:_nameLabel];