ios 检测在 UITableView 中按下了哪个 UIButton
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Detecting which UIButton was pressed in a UITableView
提问by rein
I have a UITableViewwith 5 UITableViewCells. Each cell contains a UIButtonwhich is set up as follows:
我有一个UITableView5 UITableViewCells。每个单元格包含一个UIButton，设置如下：
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
NSString *identifier = @"identifier";
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:identifier];
if (cell == nil) {
cell = [[UITableView alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:identifier];
[cell autorelelase];
UIButton *button = [[UIButton alloc] initWithFrame:CGRectMake(10, 5, 40, 20)];
[button addTarget:self action:@selector(buttonPressedAction:) forControlEvents:UIControlEventTouchUpInside];
[button setTag:1];
[cell.contentView addSubview:button];
[button release];
}
UIButton *button = (UIButton *)[cell viewWithTag:1];
[button setTitle:@"Edit" forState:UIControlStateNormal];
return cell;
}
My question is this: in the buttonPressedAction:method, how do I know which button has been pressed. I've considered using tags but I'm not sure this is the best route. I'd like to be able to somehow tag the indexPathonto the control.
我的问题是：在buttonPressedAction:方法中，我怎么知道按下了哪个按钮。我考虑过使用标签，但我不确定这是最好的路线。我希望能够以某种方式将 标记indexPath到控件上。
- (void)buttonPressedAction:(id)sender
{
UIButton *button = (UIButton *)sender;
// how do I know which button sent this message?
// processing button press for this row requires an indexPath.
}
What's the standard way of doing this?
这样做的标准方法是什么？
Edit:
编辑：
I've kinda solved it by doing the following. I would still like to have an opinion whether this is the standard way of doing it or is there a better way?
我已经通过执行以下操作解决了它。我仍然想知道这是标准的做法还是有更好的方法？
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
NSString *identifier = @"identifier";
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:identifier];
if (cell == nil) {
cell = [[UITableView alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:identifier];
[cell autorelelase];
UIButton *button = [[UIButton alloc] initWithFrame:CGRectMake(10, 5, 40, 20)];
[button addTarget:self action:@selector(buttonPressedAction:) forControlEvents:UIControlEventTouchUpInside];
[cell.contentView addSubview:button];
[button release];
}
UIButton *button = (UIButton *)[cell.contentView.subviews objectAtIndex:0];
[button setTag:indexPath.row];
[button setTitle:@"Edit" forState:UIControlStateNormal];
return cell;
}
- (void)buttonPressedAction:(id)sender
{
UIButton *button = (UIButton *)sender;
int row = button.tag;
}
What's important to note is that I can't set the tag in the creation of the cell since the cell might be dequeued instead. It feels very dirty. There must be a better way.
需要注意的重要一点是，我无法在创建单元格时设置标签，因为该单元格可能会出队。感觉很脏。一定会有更好的办法。
回答by Vladimir
In Apple's Accessorysample the following method is used:
在 Apple 的配件示例中，使用了以下方法：
[button addTarget:self action:@selector(checkButtonTapped:) forControlEvents:UIControlEventTouchUpInside];
Then in touch handler touch coordinate retrieved and index path is calculated from that coordinate:
然后在触摸处理程序中检索触摸坐标并从该坐标计算索引路径：
- (void)checkButtonTapped:(id)sender
{
CGPoint buttonPosition = [sender convertPoint:CGPointZero toView:self.tableView];
NSIndexPath *indexPath = [self.tableView indexPathForRowAtPoint:buttonPosition];
if (indexPath != nil)
{
...
}
}
回答by Cocoanut
I found the method of using the superview's superview to obtain a reference to the cell's indexPath worked perfectly. Thanks to iphonedevbook.com (macnsmith) for the tip link text
我发现使用超级视图的超级视图获取对单元格 indexPath 的引用的方法非常有效。感谢 iphonedevbook.com (macnsmith) 的提示链接文本
-(void)buttonPressed:(id)sender {
UITableViewCell *clickedCell = (UITableViewCell *)[[sender superview] superview];
NSIndexPath *clickedButtonPath = [self.tableView indexPathForCell:clickedCell];
...
}
回答by Chris Schwerdt
Here's how I do it. Simple and concise:
这是我如何做到的。简洁明了：
- (IBAction)buttonTappedAction:(id)sender
{
CGPoint buttonPosition = [sender convertPoint:CGPointZero
toView:self.tableView];
NSIndexPath *indexPath = [self.tableView indexPathForRowAtPoint:buttonPosition];
...
}
回答by Alpinista
Found a nice solution to this problem elsewhere, no messing around with tags on the button:
在别处找到了一个很好的解决这个问题的方法，不要乱用按钮上的标签：
- (void)buttonPressedAction:(id)sender {
NSSet *touches = [event allTouches];
UITouch *touch = [touches anyObject];
CGPoint currentTouchPosition = [touch locationInView:self.tableView];
NSIndexPath *indexPath = [self.tableView indexPathForRowAtPoint: currentTouchPosition];
// do stuff with the indexPath...
}
回答by magno cardona
How about sending the information like NSIndexPathin the UIButtonusing runtime injection.
如何发送的信息，如NSIndexPath在UIButton使用运行时注入。
1) You need runtime on the import
1）您需要导入运行时
2) add static constant
2) 添加静态常量
3) add NSIndexPathto your button on runtime using:
3）NSIndexPath在运行时添加到您的按钮：
(void)setMetaData:(id)target withObject:(id)newObj
(void)setMetaData:(id)target withObject:(id)newObj
4) on button press get metadata using:
4）按下按钮获取元数据使用：
(id)metaData:(id)target
（id）元数据：（id）目标
Enjoy
享受
#import <objc/runtime.h>
static char const * const kMetaDic = "kMetaDic";
#pragma mark - Getters / Setters
- (id)metaData:(id)target {
return objc_getAssociatedObject(target, kMetaDic);
}
- (void)setMetaData:(id)target withObject:(id)newObj {
objc_setAssociatedObject(target, kMetaDic, newObj, OBJC_ASSOCIATION_RETAIN_NONATOMIC);
}
#On the cell constructor
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
....
cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
....
[btnSocial addTarget:self
action:@selector(openComments:)
forControlEvents:UIControlEventTouchUpInside];
#add the indexpath here or another object
[self setMetaData:btnSocial withObject:indexPath];
....
}
#The action after button been press:
- (IBAction)openComments:(UIButton*)sender{
NSIndexPath *indexPath = [self metaData:sender];
NSLog(@"indexPath: %d", indexPath.row);
//Reuse your indexpath Now
}
回答by dennis
To do (@Vladimir)'s answer is Swift:
要做（@Vladimir）的答案是斯威夫特：
var buttonPosition = sender.convertPoint(CGPointZero, toView: self.tableView)
var indexPath = self.tableView.indexPathForRowAtPoint(buttonPosition)!
Although checking for indexPath != nilgives me the finger..."NSIndexPath is not a subtype of NSString"
虽然检查给indexPath != nil了我手指......“NSIndexPath 不是 NSString 的子类型”
回答by Ankit Bansal
func buttonAction(sender:UIButton!)
{
var position: CGPoint = sender.convertPoint(CGPointZero, toView: self.tablevw)
let indexPath = self.tablevw.indexPathForRowAtPoint(position)
let cell: TableViewCell = tablevw.cellForRowAtIndexPath(indexPath!) as TableViewCell
println(indexPath?.row)
println("Button tapped")
}
回答by Imanou Petit
With Swift 4.2 and iOS 12, you can choose one the 5 following complete examplesin order to solve your problem.
使用 Swift 4.2 和 iOS 12，您可以选择以下 5 个完整示例之一来解决您的问题。
#1. Using UIView's convert(_:to:)and UITableView's indexPathForRow(at:)
#1. 使用UIView'sconvert(_:to:)和UITableView'sindexPathForRow(at:)
import UIKit
private class CustomCell: UITableViewCell {
let button = UIButton(type: .system)
override init(style: UITableViewCell.CellStyle, reuseIdentifier: String?) {
super.init(style: style, reuseIdentifier: reuseIdentifier)
button.setTitle("Tap", for: .normal)
contentView.addSubview(button)
button.translatesAutoresizingMaskIntoConstraints = false
button.centerXAnchor.constraint(equalTo: contentView.centerXAnchor).isActive = true
button.centerYAnchor.constraint(equalTo: contentView.centerYAnchor).isActive = true
button.topAnchor.constraint(equalToSystemSpacingBelow: contentView.topAnchor, multiplier: 1).isActive = true
button.leadingAnchor.constraint(greaterThanOrEqualToSystemSpacingAfter: contentView.leadingAnchor, multiplier: 1).isActive = true
}
required init?(coder aDecoder: NSCoder) {
fatalError("init(coder:) has not been implemented")
}
}
import UIKit
class TableViewController: UITableViewController {
override func viewDidLoad() {
super.viewDidLoad()
tableView.register(CustomCell.self, forCellReuseIdentifier: "CustomCell")
}
override func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return 3
}
override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: "CustomCell", for: indexPath) as! CustomCell
cell.button.addTarget(self, action: #selector(customCellButtonTapped), for: .touchUpInside)
return cell
}
@objc func customCellButtonTapped(_ sender: UIButton) {
let point = sender.convert(CGPoint.zero, to: tableView)
guard let indexPath = tableView.indexPathForRow(at: point) else { return }
print(indexPath)
}
}
#2. Using UIView's convert(_:to:)and UITableView's indexPathForRow(at:)(alternative)
#2. 使用UIView'sconvert(_:to:)和UITableView's indexPathForRow(at:)（替代）
This is an alternative to the previous example where we pass nilto the targetparameter in addTarget(_:action:for:). This way, if the first responder does not implement the action, it will be send to the next responder in the responder chain until until a proper implementation is found.
这是我们通过前面的例子替代nil的target参数addTarget(_:action:for:)。这样，如果第一个响应者没有实现该动作，它将被发送到响应者链中的下一个响应者，直到找到正确的实现。
import UIKit
private class CustomCell: UITableViewCell {
let button = UIButton(type: .system)
override init(style: UITableViewCell.CellStyle, reuseIdentifier: String?) {
super.init(style: style, reuseIdentifier: reuseIdentifier)
button.setTitle("Tap", for: .normal)
button.addTarget(nil, action: #selector(TableViewController.customCellButtonTapped), for: .touchUpInside)
contentView.addSubview(button)
button.translatesAutoresizingMaskIntoConstraints = false
button.centerXAnchor.constraint(equalTo: contentView.centerXAnchor).isActive = true
button.centerYAnchor.constraint(equalTo: contentView.centerYAnchor).isActive = true
button.topAnchor.constraint(equalToSystemSpacingBelow: contentView.topAnchor, multiplier: 1).isActive = true
button.leadingAnchor.constraint(greaterThanOrEqualToSystemSpacingAfter: contentView.leadingAnchor, multiplier: 1).isActive = true
}
required init?(coder aDecoder: NSCoder) {
fatalError("init(coder:) has not been implemented")
}
}
import UIKit
class TableViewController: UITableViewController {
override func viewDidLoad() {
super.viewDidLoad()
tableView.register(CustomCell.self, forCellReuseIdentifier: "CustomCell")
}
override func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return 3
}
override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: "CustomCell", for: indexPath) as! CustomCell
return cell
}
@objc func customCellButtonTapped(_ sender: UIButton) {
let point = sender.convert(CGPoint.zero, to: tableView)
guard let indexPath = tableView.indexPathForRow(at: point) else { return }
print(indexPath)
}
}
#3. Using UITableView's indexPath(for:)and delegate pattern
#3. 使用UITableView'sindexPath(for:)和委托模式
In this example, we set the view controller as the delegate of the cell. When the cell's button is tapped, it triggers a call to the appropriate method of the delegate.
在这个例子中，我们将视图控制器设置为单元格的委托。当单元格的按钮被点击时，它会触发对委托的适当方法的调用。
import UIKit
protocol CustomCellDelegate: AnyObject {
func customCellButtonTapped(_ customCell: CustomCell)
}
class CustomCell: UITableViewCell {
let button = UIButton(type: .system)
weak var delegate: CustomCellDelegate?
override init(style: UITableViewCell.CellStyle, reuseIdentifier: String?) {
super.init(style: style, reuseIdentifier: reuseIdentifier)
button.setTitle("Tap", for: .normal)
button.addTarget(self, action: #selector(buttonTapped), for: .touchUpInside)
contentView.addSubview(button)
button.translatesAutoresizingMaskIntoConstraints = false
button.centerXAnchor.constraint(equalTo: contentView.centerXAnchor).isActive = true
button.centerYAnchor.constraint(equalTo: contentView.centerYAnchor).isActive = true
button.topAnchor.constraint(equalToSystemSpacingBelow: contentView.topAnchor, multiplier: 1).isActive = true
button.leadingAnchor.constraint(greaterThanOrEqualToSystemSpacingAfter: contentView.leadingAnchor, multiplier: 1).isActive = true
}
required init?(coder aDecoder: NSCoder) {
fatalError("init(coder:) has not been implemented")
}
@objc func buttonTapped(sender: UIButton) {
delegate?.customCellButtonTapped(self)
}
}
import UIKit
class TableViewController: UITableViewController, CustomCellDelegate {
override func viewDidLoad() {
super.viewDidLoad()
tableView.register(CustomCell.self, forCellReuseIdentifier: "CustomCell")
}
override func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return 3
}
override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: "CustomCell", for: indexPath) as! CustomCell
cell.delegate = self
return cell
}
// MARK: - CustomCellDelegate
func customCellButtonTapped(_ customCell: CustomCell) {
guard let indexPath = tableView.indexPath(for: customCell) else { return }
print(indexPath)
}
}
#4. Using UITableView's indexPath(for:)and a closure for delegation
#4. 使用UITableView'sindexPath(for:)和闭包进行委托
This is an alternative to the previous example where we use a closure instead of a protocol-delegate declaration to handle the button tap.
这是上一个示例的替代方案，在该示例中，我们使用闭包而不是协议委托声明来处理按钮点击。
import UIKit
class CustomCell: UITableViewCell {
let button = UIButton(type: .system)
var buttontappedClosure: ((CustomCell) -> Void)?
override init(style: UITableViewCell.CellStyle, reuseIdentifier: String?) {
super.init(style: style, reuseIdentifier: reuseIdentifier)
button.setTitle("Tap", for: .normal)
button.addTarget(self, action: #selector(buttonTapped), for: .touchUpInside)
contentView.addSubview(button)
button.translatesAutoresizingMaskIntoConstraints = false
button.centerXAnchor.constraint(equalTo: contentView.centerXAnchor).isActive = true
button.centerYAnchor.constraint(equalTo: contentView.centerYAnchor).isActive = true
button.topAnchor.constraint(equalToSystemSpacingBelow: contentView.topAnchor, multiplier: 1).isActive = true
button.leadingAnchor.constraint(greaterThanOrEqualToSystemSpacingAfter: contentView.leadingAnchor, multiplier: 1).isActive = true
}
required init?(coder aDecoder: NSCoder) {
fatalError("init(coder:) has not been implemented")
}
@objc func buttonTapped(sender: UIButton) {
buttontappedClosure?(self)
}
}
import UIKit
class TableViewController: UITableViewController {
override func viewDidLoad() {
super.viewDidLoad()
tableView.register(CustomCell.self, forCellReuseIdentifier: "CustomCell")
}
override func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return 3
}
override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: "CustomCell", for: indexPath) as! CustomCell
cell.buttontappedClosure = { [weak tableView] cell in
guard let indexPath = tableView?.indexPath(for: cell) else { return }
print(indexPath)
}
return cell
}
}
#5. Using UITableViewCell's accessoryTypeand UITableViewDelegate's tableView(_:accessoryButtonTappedForRowWith:)
#5. 使用UITableViewCell'saccessoryType和UITableViewDelegate'stableView(_:accessoryButtonTappedForRowWith:)
If your button is a UITableViewCell's standard accessory control, any tap on it will trigger a call to UITableViewDelegate's tableView(_:accessoryButtonTappedForRowWith:), allowing you to get the related index path.
如果你的按钮是 aUITableViewCell的标准附件控件，任何点击它都会触发对UITableViewDelegate's的调用tableView(_:accessoryButtonTappedForRowWith:)，允许你获取相关的索引路径。
import UIKit
private class CustomCell: UITableViewCell {
override init(style: UITableViewCell.CellStyle, reuseIdentifier: String?) {
super.init(style: style, reuseIdentifier: reuseIdentifier)
accessoryType = .detailButton
}
required init?(coder aDecoder: NSCoder) {
fatalError("init(coder:) has not been implemented")
}
}
import UIKit
class TableViewController: UITableViewController {
override func viewDidLoad() {
super.viewDidLoad()
tableView.register(CustomCell.self, forCellReuseIdentifier: "CustomCell")
}
override func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return 3
}
override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: "CustomCell", for: indexPath) as! CustomCell
return cell
}
override func tableView(_ tableView: UITableView, accessoryButtonTappedForRowWith indexPath: IndexPath) {
print(indexPath)
}
}
回答by Eld
Though I like the tag way... if you don't want to use tags for whatever reason,
you could create a member NSArrayof premade buttons:
虽然我喜欢标签方式……如果您出于任何原因不想使用标签，您可以创建一个NSArray预制按钮的成员：
NSArray* buttons ;
then create those buttons before rendering the tableView and push them into the array.
然后在呈现 tableView 之前创建这些按钮并将它们推送到数组中。
Then inside of the tableView:cellForRowAtIndexPath:function you can do:
然后在tableView:cellForRowAtIndexPath:函数内部，您可以执行以下操作：
UIButton* button = [buttons objectAtIndex:[indexPath row] ] ;
[cell.contentView addSubview:button];
Then in the buttonPressedAction:function, you can do
然后在buttonPressedAction:函数中，你可以做
- (void)buttonPressedAction:(id)sender {
UIButton* button = (UIButton*)sender ;
int row = [buttons indexOfObject:button] ;
// Do magic
}
回答by ACBurk
I would use the tag property like you said, setting the tag like so:
我会像你说的那样使用标签属性，像这样设置标签：
[button setTag:indexPath.row];
then getting the tag inside of the buttonPressedAction like so:
然后在 buttonPressedAction 中获取标签，如下所示：
((UIButton *)sender).tag
Or
或者
UIButton *button = (UIButton *)sender;
button.tag;
