IOS 7 - 如何从放置在 UITableViewCell 中的按钮获取 indexPath
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IOS 7 - How to get the indexPath from button placed in UITableViewCell
提问by Arun
I've programmatically created a UITableView and added UISwitch to it's cell accessory view.
我以编程方式创建了一个 UITableView 并将 UISwitch 添加到它的单元格附件视图中。
This is my code for UISwitch in cell accessory view in cellForRowAtIndexPathmethod.
这是我在cellForRowAtIndexPath方法中的单元格附件视图中的 UISwitch 代码。
UISwitch *accessorySwitch = [[UISwitch alloc]initWithFrame:CGRectZero];
[accessorySwitch setOn:NO animated:YES];
[accessorySwitch addTarget:self action:@selector(changeSwitch:) forControlEvents:UIControlEventValueChanged];
cell.accessoryView = accessorySwitch;
This is the method which is called after the button is clicked.
这是单击按钮后调用的方法。
- (void)changeSwitch:(UISwitch *)sender{
UITableViewCell *cell = (UITableViewCell *)[sender superview];
NSIndexPath *indexPath = [self.filterTableView indexPathForCell:cell];
NSLog(@"%ld",(long)indexPath);
……………. My other code…….
}
I am able to print the index path value in iOS 6 But in iOS 7 it prints nil,
我能够在 iOS 6 中打印索引路径值但在 iOS 7 中它打印 nil，
Am i missing anything in iOS 7 or there is some other approach to get the indexPath in iOS 7
我是否缺少 iOS 7 中的任何内容，或者还有其他一些方法可以在 iOS 7 中获取 indexPath
Thanks, Arun.
谢谢，阿伦。
回答by lanbo
NSLog(@"%ld",(long)indexPath);is wrong this will print the pointer address of indexPath
NSLog(@"%ld",(long)indexPath);是错误的，这将打印 indexPath 的指针地址
try using following codes
尝试使用以下代码
CGPoint center= sender.center;
CGPoint rootViewPoint = [sender.superview convertPoint:center toView:self.filterTableView];
NSIndexPath *indexPath = [self.filterTableView indexPathForRowAtPoint:rootViewPoint];
NSLog(@"%@",indexPath);
回答by Ishan Handa
Swiftsolution: A UITableView extension like this one can be useful for this.
Swift解决方案：像这样的 UITableView 扩展对此很有用。
extension UITableView {
func indexPathForView(view: AnyObject) -> NSIndexPath? {
let originInTableView = self.convertPoint(CGPointZero, fromView: (view as! UIView))
return self.indexPathForRowAtPoint(originInTableView)
}
}
Usage becomes easy everywhere.
使用变得容易无处不在。
let indexPath = tableView.indexPathForView(button)
回答by Adnan Aftab
If you have button in cell. You can get cell by calling superview. And then can get Indexpath by this way.
如果您在单元格中有按钮。您可以通过调用 superview 来获取单元格。然后可以通过这种方式获取Indexpath。
(void)obButtonTap:(UIButton *)sender {
UITableViewCell *cell = (UITableViewCell *)sender.superview;
NSIndexPath *indexPath = [tableView indexPathForCell:cell];
}
回答by Janak Nirmal
You can assign tags to each switch in cellForRowAtIndexPath method like
您可以为 cellForRowAtIndexPath 方法中的每个开关分配标签，例如
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
UISwitch *accessorySwitch = [[UISwitch alloc]initWithFrame:CGRectZero];
[accessorySwitch setOn:NO animated:YES];
[accessorySwitch addTarget:self action:@selector(changeSwitch:) forControlEvents:UIControlEventValueChanged];
cell.accessoryView = accessorySwitch;
accessorySwitch.tag = indexPath.row;
}
- (void)changeSwitch:(UISwitch *)sender{
NSIndexPath *indexPath = [NSIndexPath indexPathWithIndex:[sender tag]];
NSLog(@"%ld",(long)indexPath);
}
回答by Logic
SWIFT 4 :
快速 4：
extension UITableView {
func indexPathForView(view: AnyObject) -> NSIndexPath? {
let originInTableView = self.convert(CGPoint.zero, from: (view as! UIView))
return self.indexPathForRow(at: originInTableView)! as NSIndexPath
}
}
回答by Chris
SWIFT 4 Conversion, creates global extension:
SWIFT 4 转换，创建全局扩展：
extension UITableView {
func indexPathForView(view: UIView) -> IndexPath? {
let originInTableView = self.convert(CGPoint.zero, from: (view))
return self.indexPathForRow(at: originInTableView)
}
}
Usage example:
用法示例：
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = ...
cell.myButton.addTarget(self, action: #selector(myButtonAction(_:)), for: .primaryActionTriggered)
return cell
}
@objc func myButtonAction(_ button:UIButton) {
guard let ip = self.tableView.indexPathForView(view: button) else {
return
}
}
回答by D.C.
You are probably getting burned, making the assumption that the switch's superviewis going to be the tableViewCell. Maybe in iOS 7 they changed the hierarchy to achieve some sort of visual effect; maybe there is a new view inserted in there.
您可能会被烧毁，假设交换机superview将是tableViewCell. 也许在 iOS 7 中他们改变了层次结构来实现某种视觉效果；也许那里插入了一个新视图。
You could possibly subclass UISwitchand give it an indexPathproperty. Then in your cellForRowAtIndexPath, assign it there so you have a reference.
你可以子类化UISwitch并给它一个indexPath属性。然后在您的 中cellForRowAtIndexPath，将它分配到那里，以便您有参考。
回答by Omaty
I think that is dangerous to rely on the position of the button to know which one have been clicked.
我认为依靠按钮的位置来知道点击了哪个按钮是危险的。
I prefere create a dictionary taking as a key the button/switch itself, and as a value the indexpath :
我更喜欢创建一个字典，将按钮/开关本身作为键，并将 indexpath 作为值：
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath{
...
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
NSValue * accessorySwitchKey = [NSValue valueWithNonretainedObject:[cell settingSwitch]];
[[self switchIndexDictionary]setObject:indexPath accessorySwitchKey];
...
}
then when the switch/button is triggered I get the indexpath easily from my dictionary :
然后当开关/按钮被触发时，我很容易从我的字典中获取索引路径：
- (void)toggleSetting:(id)sender
{
UISwitch *selectedSwitch = (UISwitch *) sender;
NSValue * accessorySwitchKey = [NSValue valueWithNonretainedObject:selectedSwitch];
NSIndexPath *indexPath = [[self switchIndexDictionary]objectForKey: accessorySwitchKey];
}
