Swift ---UIView addSubView(UItextView),什么都不能显示答案

【问题标题】：Swift ---UIView addSubView(UItextView),nothing can be displayedSwift ---UIView addSubView(UItextView),什么都不能显示
【发布时间】：2016-12-08 04:09:51
【问题描述】：

class ViewController: UIViewController {

override func viewDidLoad() {
    super.viewDidLoad()
    // Do any additional setup after loading the view, typically from a nib.
    //let attstring = NSMutableAttributedString
    let testTextView = UITextView.init(frame: CGRect.init(x: 0, y: 0, width: 100, height: 100))

    let attstring = NSMutableAttributedString.init(string: "You can check flights from the past 4 days, or plan 3 days ahead.\n\nTo find out when and where we fly for the rest of the year, please view our Timetable.", attributes: [NSFontAttributeName:UIFont.boldSystemFont(ofSize: 12),NSForegroundColorAttributeName:UIColor.red])

    attstring.setAttributes([NSForegroundColorAttributeName:UIColor.blue], range: NSRange.init(location: attstring.length-10, length: 9))

    print("test test!")
    self.view.addSubview(testTextView)
}

什么都没有显示，这是什么问题！？

【问题讨论】：

标签： uiview swift3 addsubview

【解决方案1】：

在 swift 3 中你应该这样写：

let testTextView = UITextView.init(frame: CGRect.init(x: 0, y: 0, width: 100, height: 100))
    let attstring = NSMutableAttributedString.init(string: "You can check flights from the past 4 days, or plan 3 days ahead.\n\nTo find out when and where we fly for the rest of the year, please view our Timetable.", attributes: [NSFontAttributeName:UIFont.boldSystemFont(ofSize: 12),NSForegroundColorAttributeName:UIColor.red])
    testTextView.attributedText = attstring
    attstring.setAttributes([NSForegroundColorAttributeName:UIColor.blue], range: NSRange.init(location: attstring.length-10, length: 9))
    self.view.addSubview(testTextView)

【讨论】：