但是,我不用使用Core Data来回答这个问题.代码有点乱七八糟,但我们走了

首先,您必须创建一个存储日期和文本的对象. testArray将是这些对象的数组,而不是String数组.例如：

class DateTextItem: NSObject {
    var text: String = ""
    var insertDate: NSDate = NSDate()    
}
 
var testArray = [DateTextItem]()

然后当saveButton被命中时,我们将创建并添加DateTextItem对象.如果dateInTable不存在,我们还将添加日期.

@IBAction func saveButton(sender: AnyObject) {
    let newItem = DateTextItem()
    newItem.text = "Test \(testArray.count)"
 
    // this is for development only
    // increment the date after 2 records so we can test grouping by date
    if testArray.count >= (testArray.count/2) {
        let incrementDate = NSTimeInterval(86400*(testArray.count/2))
        newItem.insertDate = NSDate(timeIntervalSinceNow:incrementDate)
    }
 
    testArray.append(newItem)
 
    // this next bit will create a date string and check if it's in the sectionInTable
    let df = NSDateFormatter()
    df.dateFormat = "MM/dd/yyyy"
    let dateString = df.stringFromDate(newItem.insertDate)
 
    // create sections NSSet so we can use 'containsObject'
    let sections: NSSet = NSSet(array: sectionsInTable)
 
    // if sectionsInTable doesn't contain the dateString,then add it
    if !sections.containsObject(dateString) {
        sectionsInTable.append(dateString)
    }
 
    self.tableView.reloadData()
}

接下来,我创建了一个函数来获取一个部分中的项目,因为我们需要它在几个地方.

func getSectionItems(section: Int) -> [DateTextItem] {
    var sectionItems = [DateTextItem]()
 
    // loop through the testArray to get the items for this sections's date
    for item in testArray {
        let dateTextItem = item as DateTextItem
        let df = NSDateFormatter()
        df.dateFormat = "MM/dd/yyyy"
        let dateString = df.stringFromDate(dateTextItem.insertDate)
 
        // if the item's date equals the section's date then add it
        if dateString == sectionsInTable[section] as NSString {
            sectionItems.append(dateTextItem)
        }
    }
 
    return sectionItems
}

最后,这里是Table View数据源方法

// MARK: - Table view data source
override func numberOfSectionsInTableView(tableView: UITableView) -> Int {
    return sectionsInTable.count
}
 
override func tableView(tableView: UITableView,numberOfRowsInSection section: Int) -> Int {
    return self.getSectionItems(section).count
}
 
override func tableView(tableView: UITableView,cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
 
    // Configure the cell...
    var cell = UITableViewCell(style: UITableViewCellStyle.Default,reuseIdentifier: "Cell")
 
    // get the items in this section
    let sectionItems = self.getSectionItems(indexPath.section)
    // get the item for the row in this section
    let dateTextItem = sectionItems[indexPath.row]
 
    cell.textLabel.text = dateTextItem.text
 
    return cell
}
 
// print the date as the section header title
override func tableView(tableView: UITableView,titleForHeaderInSection section: Int) -> String? {
    return sectionsInTable[section]
}