label 根据文字label自适应宽度

 UILabel *Label = [[UILabel alloc]init];

    Label.text = @"长一点也是可以的";

    Label.textColor = black_Color;

    Label.textAlignment = NSTextAlignmentLeft;

   gsmcLabel.font = [UIFont systemFontOfSize:12];

    CGSize size = [Label.text sizeWithAttributes:[NSDictionary dictionaryWithObjectsAndKeys:Label.font,NSFontAttributeName,nil]];

    CGFloat lblWidth = size.width;

   Label.frame = CGRectMake(20, 0, lblWidth, 40);

 

如果长度有限制 加一个判断