22.Storyboard中使用xib,xib中使用xib并实现预览

storyboard中能够插入xib定义的view,并能够预览,xib中插入xib使用方法和storyboard是一样的方法.(Swift3.0版)

1. 先新建好自定义的xib和对应的类,注意类名必须和xib中绑定的类名一致,否则无法在类中关联xib中的组件(进行连线)

   
   
   

   Snip20160926_4.png

自定义类的代码如下:

import UIKit

@IBDesignable
class CustomView: UIView {
    
    @IBOutlet weak var label: UILabel!
    @IBAction func onTouchUp(_ sender: UIButton) {
        onButtonRun?()
    }
    
    @IBInspectable
    var name:String?{
        get{
            return label.text
        }
        set{
            label.text = newValue
        }
    }
    
    var onButtonRun:(()->Void)?
    //初始化时将xib中的view添加进来
    var contentView:UIView!
    override init(frame: CGRect) {
        super.init(frame: frame)
        contentView = loadViewFromNib()
        addSubview(contentView)
        addConstraints()
    }
    
    required init?(coder aDecoder: NSCoder) {
        super.init(coder: aDecoder)
        contentView = loadViewFromNib()
        addSubview(contentView)
        addConstraints()
    }
    //加载xib
    func loadViewFromNib() -> UIView {
        let className = type(of: self)
        let bundle = Bundle(for: className)
        let name = NSStringFromClass(className).components(separatedBy: ".").last
        let nib = UINib(nibName: name!, bundle: bundle)
        let view = nib.instantiate(withOwner: self, options: nil).first as! UIView
        return view
    }
    //设置好约束
    func addConstraints() {
        contentView.translatesAutoresizingMaskIntoConstraints = false
        
        var constraint = NSLayoutConstraint(item: contentView, attribute: .leading, relatedBy: .equal, toItem: self, attribute: .leading, multiplier: 1, constant: 0)
        addConstraint(constraint)
        constraint = NSLayoutConstraint(item: contentView, attribute: .trailing, relatedBy: .equal, toItem: self, attribute: .trailing, multiplier: 1, constant: 0)
        addConstraint(constraint)
        constraint = NSLayoutConstraint(item: contentView, attribute: .top, relatedBy: .equal, toItem: self, attribute: .top, multiplier: 1, constant: 0)
        addConstraint(constraint)
        constraint = NSLayoutConstraint(item: contentView, attribute: .bottom, relatedBy: .equal, toItem: self, attribute: .bottom, multiplier: 1, constant: 0)
        addConstraint(constraint)
    }
}

2.在storyboard中拖入一个View组件,然后将class设置为我们自定义的类名"CustomView"

Paste_Image.png

3.这是我在自定义类中增加的可以编辑的属性,修改也能够实时预览它

Snip20160926_6.png

源码实现:https://github.com/ghyh22/StoryboardInsertXibView

参考:http://swiftdeveloperblog.com/creating-custom-user-interface-files-with-xib-in-xcode-6-and-swift/