设置以编程方式创建的UITextView的insets

Question

我以编程的方式创建了一个UITextView，但不幸的是，当您将textview从属性检查器拖到Main.storyboard时，它的行为方式与文本视图不同。例如:我以编程方式创建的textview中的文本不会在textview框架的右侧“断线”。尽管文档中提到了textContainerInsets，但我似乎无法让它正常工作。(Xcode不识别该属性)

class ViewController: UIViewController, UIScrollViewDelegate {


let scrollView = UIScrollView(frame: UIScreen.mainScreen().bounds)
var textView:UITextView!

override func viewDidLoad() {
    super.viewDidLoad()
    self.view = self.scrollView

    let screenSize: CGRect = UIScreen.mainScreen().bounds
    let screenWidth = screenSize.width;
    let screenHeight = screenSize.height;      

    //Create textview
    let textView : UITextField = UITextField(frame : CGRect(x:10, y:(screenHeight/2), width:        (screenWidth-20), height: (screenHeight/3) ))
    textView.backgroundColor = UIColor( red: 0.9, green: 0.9, blue:0.9, alpha: 1.0 )
    textView.placeholder = NSLocalizedString("Start typing...", comment: "")   
    textView.borderStyle = UITextBorderStyle.Line;
    //   textView.autocorrectionType = .Yes
    self.view.addSubview( textView )

}

有什么方法可以使文本在我的文本视图中表现为正常吗？多行而不是一行？

Answer 1

您是在代码中创建UITextField，而不是UITextView。

这是：

let textView : UITextField = UITextField(frame : CGRect(x:10, y:(screenHeight/2), width:(screenWidth-20), height: (screenHeight/3) ))

应：

let textView : UITextView = UITextView(frame : CGRect(x:10, y:(screenHeight/2), width:        (screenWidth-20), height: (screenHeight/3) ))

您似乎还将textView声明为类中的一个属性，因此您可能不希望在其中包含let：

textView = UITextView(frame : CGRect(x:10, y:(screenHeight/2), width:        (screenWidth-20), height: (screenHeight/3) ))

Answer 2

以下是我如何编程实现您的UITextView -

override func viewDidLoad() {
    super.viewDidLoad();

    self.view.translatesAutoresizingMaskIntoConstraints = false;

    let screenSize: CGRect = UIScreen.mainScreen().bounds;
    let screenWidth = screenSize.width;
    let screenHeight = screenSize.height;

    //Create textview
    let textView : UITextView = UITextView(frame : CGRect(x:      10,
                                                          y:      (screenHeight/2),
                                                          width:  (screenWidth-20),
                                                          height: (screenHeight/3)));

    textView.backgroundColor = UIColor( red: 0.9, green: 0.9, blue:0.9, alpha: 1.0 );

    textView.text = NSLocalizedString("Start typing... maybe...", comment: "");

    //textView.borderStyle:  border's are not supported by the UITextView

    self.view.addSubview(textView);

    return;
}