swift 如何在 UIButton 上包装文本

Question

我尝试按如下方式在按钮上包装文本：

nextButton=UIButton(frame: CGRectMake(buttonHWidth, textHeigth, buttonHWidth, buttonHeigth));

        nextButton.backgroundColor = UIColor.lightGrayColor()
        nextButton.setTitle("", forState: UIControlState.Normal)
        nextButton.addTarget(self, action: "buttonAction:", forControlEvents: UIControlEvents.TouchUpInside)
        nextButton.tag = 22;


        label_nextButton = UILabel(frame: CGRectMake(buttonHWidth, textHeigth, buttonHWidth, buttonHeigth));
        label_nextButton.textAlignment = NSTextAlignment.Center;
        label_nextButton.numberOfLines = 2;
        label_nextButton.font = UIFont.systemFontOfSize(16.0);
        label_nextButton.text = "Prss next Press next";
        label_nextButton.textColor=UIColor.blackColor();

        nextButton.addSubview(label_nextButton);
        self.view.addSubview(nextButton);

我可以看到设备上的按钮，但看不到任何文字。

我做错了什么？或者这可以在不向按钮添加标签的情况下完成吗？感谢您的帮助。

插图。看起来像：

刚刚做的时候：

nextButton.setTitle("this is a very very long text", forState: UIControlState.Normal)

Answer 1

您需要在setTitle方法中写入文字：

nextButton.setTitle("This is the very very long text!", forState: UIControlState.Normal)

设置标题标签的行数和换行模式：

nextButton.titleLabel.numberOfLines = 0; // Dynamic number of lines
nextButton.titleLabel.lineBreakMode = NSLineBreakByWordWrapping;

Update to Swift 4

nextButton.titleLabel.numberOfLines = 0; // Dynamic number of lines
nextButton.titleLabel.lineBreakMode = NSLineBreakMode.byWordWrapping;

Answer 2

Swift 4

要通过用“...”替换文本中间来缩短文本，您应该使用 NSLineBreakMode.byWordWrapping:

nextButton.titleLabel?.lineBreakMode = NSLineBreakMode.byWordWrapping

要通过将文本末尾替换为“...”来缩短文本，您应该使用 NSLineBreakMode.byTruncatingTail:

nextButton.titleLabel?.lineBreakMode = NSLineBreakMode.byTruncatingTail

要查看可用包装模式的完整列表，请查看 NSLineBreakMode 文档：https://developer.apple.com/documentation/appkit/nslinebreakmode

swift 如何在 UIButton 上包装文本

How to wrap a text on a UIButton in swift

uibutton

uilabel

ios

swift