如何根据textlength

Question

我想根据文本长度增加textview高度我尝试了一些代码，但结果就像第一张图片一样，但我想像第二张图片一样得到结果。

码

- (void)viewDidLoad {
    [super viewDidLoad];

    textview.text = @"This returns the size of the rectangle that fits the given string with the given font. Pass in a size with the desired width and a maximum height, and then you can look at the height returned to fit the text. There is a version that lets you specify line break mode also.This returns the size of the rectangle that fits the given string with the given font. Pass in a size with the desired width and a maximum height, and then you can look at the height returned to fit the text. There is a version that lets you specify line break mode yes.";

    CGRect frame = textview.frame;
    frame.size.height = textview.contentSize.height;
    textview.frame = frame;
    textview.ScrollEnabled = NO;
}

Answer 1

Might be help you. It's a Github controller

Answer 2

看看this example。基本思想是从控制器中隔离调整大小代码。示例中的代码可以重写：

     override func updateConstraints() {

        let contentSize = sizeThatFits(CGSizeMake(frame.size.width, CGFloat.max))

        for constraint in constraints() {

            if constraint.isKindOfClass(NSLayoutConstraint) {      
                let constraint = constraint as! NSLayoutConstraint
                if constraint.firstAttribute == NSLayoutAttribute.Height {
                    constraint.constant = contentSize.height  
                }
            }

        }

        super.updateConstraints()

    }

Answer 3

如果您正在使用约束（并且您应该），则不要设置任何高度约束并禁用滚动。 这将根据内容自动更新文本视图的高度。