Swift 从零开始 15_自定义tableViewCell及自定义cell删除按钮

MARK: 此篇介绍的是用纯代码自定义封装cell,xib及sb后续更新.

1.创建自定义cell文件,继承UITableViewCell

import UIKit
class RecordTableViewCell: UITableViewCell {
  
  var deleteBtn: UIButton!
  
  override func awakeFromNib() {
    super.awakeFromNib()
    //设置cell的分割线顶靠屏幕边缘(自定义方法)
    setSeparatorByEdge()
  }
  
  //如果子控件的frame会根据内容的变化而变化(即每个cell的子控件不是完全一样的),
  考虑到cell会重用,这种时候就不在这里直接写死子控件的frame,
  而是重写layouSubviews方法,动态的根据计算子控件的frame.
  override func layoutSubviews() {
    super.layoutSubviews()
    
    setUpViews()
  }
  
  //重写initWithStyle:方法,在里面创建所有可能出现的子控件
  override init(style: UITableViewCellStyle, reuseIdentifier: String?) {
    super.init(style: style, reuseIdentifier: reuseIdentifier)
    if !self.isEqual(nil) {
     
      deleteBtn = UIButton()
      self.contentView.addSubview(deleteBtn)
    }
  }
  
    func setUpViews() {
    
    deleteBtn("删除cell", forState: UIControlState.Normal)
    deleteBtn.setTitleColor(UIColor.hexStringToColor("#EA5413"), forState: UIControlState.Normal)
    deleteBtn.titleLabel?.font = UIFont.systemFontOfSize(12)
    deleteBtn.layer.borderWidth = 1
    deleteBtn.layer.borderColor = UIColor.hexStringToColor("ea5413").CGColor
    
    
    deleteBtn.snp_makeConstraints(closure: { (make) in
      make.centerY.equalTo(self.contentView.snp_centerY)
      make.right.equalTo(self.contentView.snp_right).offset(-10)
      make.width.equalTo(self.contentView.snp_width).multipliedBy(0.155)
      make.height.equalTo(self.contentView.snp_height).multipliedBy(0.455)
    })
  }
  
  required init?(coder aDecoder: NSCoder) {
    fatalError("init(coder:) has not been implemented")
  }
  
  override func setSelected(selected: Bool, animated: Bool) {
    super.setSelected(selected, animated: animated)
    
    // Configure the view for the selected state
  }
}

2.在控制器中

(1) 注册cell

1	tableView.registerClass(RecordTableViewCell.classForCoder(), forCellReuseIdentifier: "cell")

(2) cellForRowAtIndex方法中创建自定义cell

func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
    let cell: RecordTableViewCell = self.tableView.dequeueReusableCellWithIdentifier(identifier) as! RecordTableViewCell
    
    cell.backgroundColor = UIColor.clearColor()
 
    cell.deleteBtn.tag = indexPath.row
    
    cell.deleteBtn.addTarget(self, action: #selector(RecordViewController.deleteBtnClick(_:)), forControlEvents: UIControlEvents.TouchUpInside)
    return cell
  }
  
  //deleteBtn响应方法
  func deleteBtnClick(sender: UIButton) {
    dataSourceArr.removeAtIndex(sender.tag)
    tableView.reloadData()
  }

总结:

代码自定义cell要注意cell下子控件的创建及frame约束等.这里只是提供一个思路,抛砖引玉,具体的需求具体对待.

2016-12-16