I have a UITableView. When the I tap the Edit button, it goes into editing mode, but the red '-' buttons on each cell don't make the Delete button appear.
我有一个UITableView。当我点击编辑按钮时，它进入编辑模式，但是每个单元格上的红色“-”按钮不会显示删除按钮。
Here's the code I used for this:
下面是我使用的代码:
//
// ViewController.swift
// Measured Blood Lost
//
// Created by Josh Birnholz on 4/11/16.
// Copyright © 2016 Josh Birnholz. All rights reserved.
//
import UIKit
class MainViewController: UITableViewController, weightCellDelegate {
@IBOutlet weak var totalWeightBarButtonItem: UIBarButtonItem!
private var totalWeightLabel = UILabel(frame: CGRectZero)
@IBOutlet weak var totalWeightTextField: UITextField!
var totalWeight: Int = 0
let availableWeights: [Weight] = [Weight(name: "Lap", weightInGrams: 22),
Weight(name: "Lap counting bag", weightInGrams: 25),
Weight(name: "Sterile green towel", weightInGrams: 90),
Weight(name: "Sterile blue towel", weightInGrams: 55),
Weight(name: "Kick bucket red bag", weightInGrams: 50),
Weight(name: "Medium red bag", weightInGrams: 70),
Weight(name: "Large red bag", weightInGrams: 120),
Weight(name: "Washcloth", weightInGrams: 30),
Weight(name: "Towel", weightInGrams: 192),
Weight(name: "Blue cloth underpad", weightInGrams: 340),
Weight(name: "Regular patient gown", weightInGrams: 340),
Weight(name: "XL patient gown", weightInGrams: 498),
Weight(name: "Under buttocks drape", weightInGrams: 76),
Weight(name: "Mini lap", weightInGrams: 6),
Weight(name: "Vag packing", weightInGrams: 16),
Weight(name: "Pink peri pad", weightInGrams: 26),
Weight(name: "Large white (Capri +)", weightInGrams: 40)
]
var weights = [Weight]()
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.
totalWeightLabel.backgroundColor = UIColor.clearColor()
totalWeightLabel.textAlignment = .Center
totalWeightBarButtonItem.customView = totalWeightLabel
navigationItem.leftBarButtonItem = editButtonItem()
updateTotalWeightLabel()
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
override func numberOfSectionsInTableView(tableView: UITableView) -> Int {
return 1
}
override func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return weights.count
}
override func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath)
-> UITableViewCell {
let cell = tableView.dequeueReusableCellWithIdentifier("WeightCell", forIndexPath: indexPath) as! WeightCell
let name = weights[indexPath.row].name
let weightInGrams = weights[indexPath.row].weightInGrams
let quantity = weights[indexPath.row].quantity
if let nameLabel = cell.viewWithTag(100) as? UILabel {
nameLabel.text = "\(name.pluralize(quantity))"
nameLabel.textColor = quantity == 0 ? UIColor.lightGrayColor() : UIColor.blackColor()
}
if let weightLabel = cell.viewWithTag(101) as? UILabel {
weightLabel.text = "-\(weightInGrams * quantity) gm"
}
if let quantityTextField = cell.viewWithTag(102) as? UITextField {
quantityTextField.text = quantity == 0 ? "" : String(quantity)
cell.delegate = self
}
return cell
}
func quantityChanged(cell: WeightCell, newQuantity: Int, actionSender: AnyObject) {
let point = actionSender.convertPoint(CGPointZero, toView: tableView)
let indexPath = self.tableView.indexPathForRowAtPoint(point)!
weights[indexPath.row].quantity = newQuantity
tableView.reloadData()
updateTotalWeightLabel()
}
@IBOutlet weak var addButton: UIBarButtonItem!
@IBAction func addButtonPressed(sender: AnyObject) {
addItems([randomWeight(), randomWeight()])
updateTotalWeightLabel()
}
let nameTextField = UITextField()
let weightTextField = UITextField()
func randomWeight() -> Weight {
let randomWeight = availableWeights[Int(arc4random_uniform(UInt32(availableWeights.count)))]
let quantity = Int(arc4random_uniform(5))
return Weight(name: randomWeight.name, weightInGrams: randomWeight.weightInGrams, quantity: quantity)
}
func addItems(weightsToAdd: [Weight]) {
for weightToAdd in weightsToAdd {
print("weightToAdd: \(weightToAdd.quantity) \(weightToAdd.name.pluralize(weightToAdd.quantity))")
if weightToAdd.quantity > 0 {
var foundIndex: Int?
var index = 0
for presentWeight in weights {
if presentWeight.name == weightToAdd.name {
foundIndex = index
}
index += 1
}
if foundIndex == nil {
weights.append(weightToAdd)
let indexPath = NSIndexPath(forRow: weights.count-1, inSection: 0)
tableView.insertRowsAtIndexPaths([indexPath], withRowAnimation: .Automatic)
} else {
weights[foundIndex!].quantity += weightToAdd.quantity
tableView.reloadData()
}
}
}
}
@IBAction func totalWeightTextFieldEditingBegan(sender: AnyObject) {
if totalWeightTextField.text!.hasSuffix(" gm") {
totalWeightTextField.text = totalWeightTextField.text!.substringToIndex(totalWeightTextField.text!.endIndex.advancedBy(-3))
}
}
@IBAction func totalWeightTextFieldEditingEnded(sender: AnyObject) {
totalWeightTextField.text!.numericize()
if totalWeightTextField.text! == "" {
totalWeight = 0
} else {
if let totalWeightInt = Int(totalWeightTextField.text!) {
totalWeight = totalWeightInt
} else {
totalWeight = Int.max
}
totalWeightTextField.text = "\(String(totalWeight)) gm"
}
updateTotalWeightLabel()
}
func updateTotalWeightLabel() {
var measuredBloodLost = totalWeight
for weight in weights {
measuredBloodLost = measuredBloodLost - (weight.weightInGrams * weight.quantity)
}
if measuredBloodLost < 0 {
totalWeightLabel.textColor = UIColor.redColor()
} else {
totalWeightLabel.textColor = UIColor.blackColor()
}
totalWeightLabel.text = "Measured Blood Lost: \(measuredBloodLost) mL"
totalWeightLabel.sizeToFit()
}
override func tableView(tableView: UITableView, canEditRowAtIndexPath indexPath: NSIndexPath) -> Bool {
return true
}
override func tableView(tableView: UITableView, commitEditingStyle editingStyle: UITableViewCellEditingStyle, forRowAtIndexPath indexPath: NSIndexPath) {
if editingStyle == .Delete {
// Remove data
weights.removeAtIndex(indexPath.row)
tableView.deleteRowsAtIndexPaths([indexPath], withRowAnimation: UITableViewRowAnimation.Automatic)
}
updateTotalWeightLabel()
}
}
Swiping the cell does make the delete button appear, and it deletes the cell and data properly, so I can't figure out what I'm doing wrong!
滑动单元格确实会让删除按钮出现，并且它会正确地删除单元格和数据，所以我不知道我做错了什么!
Thanks.
谢谢。
Edit: Here is a link to the Xcode project.
这里是一个Xcode项目的链接。
2 个解决方案
#1
1
ok, the problem is the tapgesturerecognizer in your navigationcontroller. if you want to keep it you could use something like the following:
问题是导航控制器中的tapgesturerecognizer。如果你想保留它，你可以使用如下的东西:
class NavigationController : UINavigationController, UIGestureRecognizerDelegate {
override func viewDidLoad() {
super.viewDidLoad()
let tap: UITapGestureRecognizer = UITapGestureRecognizer(target: self, action: #selector(NavigationController.dismissKeyboard))
tap.delegate = self
view.addGestureRecognizer(tap)
}
func dismissKeyboard() {
view.endEditing(true)
}
func gestureRecognizer(gestureRecognizer: UIGestureRecognizer, shouldReceiveTouch touch: UITouch) -> Bool {
if let view = touch.view where String(view.dynamicType) == "UITableViewCellEditControl" {
print("do not receive touch")
return false
}
print("do receive touch")
return true
}
}
#2
1
Dont forget to put this in cellForRowAtIndexPath
别忘了把这个放到cellForRowAtIndexPath中
cell.editingAccessoryType = .DetailDisclosureButton
You also need to do
你也需要这么做
self.tableView.setEditing(true, animated: true)
#1
1
ok, the problem is the tapgesturerecognizer in your navigationcontroller. if you want to keep it you could use something like the following:
问题是导航控制器中的tapgesturerecognizer。如果你想保留它，你可以使用如下的东西:
class NavigationController : UINavigationController, UIGestureRecognizerDelegate {
override func viewDidLoad() {
super.viewDidLoad()
let tap: UITapGestureRecognizer = UITapGestureRecognizer(target: self, action: #selector(NavigationController.dismissKeyboard))
tap.delegate = self
view.addGestureRecognizer(tap)
}
func dismissKeyboard() {
view.endEditing(true)
}
func gestureRecognizer(gestureRecognizer: UIGestureRecognizer, shouldReceiveTouch touch: UITouch) -> Bool {
if let view = touch.view where String(view.dynamicType) == "UITableViewCellEditControl" {
print("do not receive touch")
return false
}
print("do receive touch")
return true
}
}
#2
1
Dont forget to put this in cellForRowAtIndexPath
别忘了把这个放到cellForRowAtIndexPath中
cell.editingAccessoryType = .DetailDisclosureButton
You also need to do
你也需要这么做
self.tableView.setEditing(true, animated: true)