我如何将UISwitch
嵌入UITableView
单元格中?可以在设置菜单中看到示例。
我当前的解决方案:
UISwitch *mySwitch = [[[UISwitch alloc] init] autorelease];
cell.accessoryView = mySwitch;
我如何将UISwitch
嵌入UITableView
单元格中?可以在设置菜单中看到示例。
我当前的解决方案:
UISwitch *mySwitch = [[[UISwitch alloc] init] autorelease];
cell.accessoryView = mySwitch;
通常情况下,将其设置为accessoryView是最好的选择。您可以在tableView:cellForRowAtIndexPath:
中进行设置。当切换按钮被翻转时,您可能想使用目标/操作来执行某些操作。像这样:
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
switch( [indexPath row] ) {
case MY_SWITCH_CELL: {
UITableViewCell *aCell = [tableView dequeueReusableCellWithIdentifier:@"SwitchCell"];
if( aCell == nil ) {
aCell = [[[UITableViewCell alloc] initWithFrame:CGRectZero reuseIdentifier:@"SwitchCell"] autorelease];
aCell.textLabel.text = @"I Have A Switch";
aCell.selectionStyle = UITableViewCellSelectionStyleNone;
UISwitch *switchView = [[UISwitch alloc] initWithFrame:CGRectZero];
aCell.accessoryView = switchView;
[switchView setOn:NO animated:NO];
[switchView addTarget:self action:@selector(switchChanged:) forControlEvents:UIControlEventValueChanged];
[switchView release];
}
return aCell;
}
break;
}
return nil;
}
- (void)switchChanged:(id)sender {
UISwitch *switchControl = sender;
NSLog( @"The switch is %@", switchControl.on ? @"ON" : @"OFF" );
}
switchView.tag = indexPath.row
用于检测哪一行的开关发生了变化,适用于Swift。 - Nazmul HasanaccessoryView
中。这样它将显示在单元格的右侧,这可能是你想要的。if (indexPath.row == 0) {//If you want UISwitch on particular row
UISwitch *theSwitch = [[UISwitch alloc] initWithFrame:CGRectZero];
[cell addSubview:theSwitch];
cell.accessoryView = theSwitch;
}
initWithFrame
?为什么要使用 addSubview
?switch
不能用作变量名。 - testing针对Swift用户
override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = UITableViewCell(style: .default, reuseIdentifier: "TableIdentifer")
let aswitch = UISwitch()
cell.accessoryView = aswitch
}
这是一个更完整的解决方案,其中关闭和打开在视图层(UITableViewCell)上发生,并通过 didSelect
和 didDeselect
将事件转发给tableView代理:
class CustomCell: UITableViewCell {
private lazy var switchControl: UISwitch = {
let s = UISwitch()
s.addTarget(self, action: #selector(switchValueDidChange(_:)), for: .valueChanged)
return s
}()
override func awakeFromNib() {
self.accessoryView = switchControl
self.selectionStyle = .none // to show the selection style only on the UISwitch
}
override func setSelected(_ selected: Bool, animated: Bool) {
super.setSelected(selected, animated: animated)
(self.accessoryView as? UISwitch)?.isOn = selected
}
@objc private func switchValueDidChange(_ sender: UISwitch) { // needed to treat switch changes as if the cell was selected/unselected
guard let tv = self.superview as? UITableView, let ip = tv.indexPath(for: self) else {
fatalError("Unable to cast self.superview as UITableView or get indexPath")
}
setSelected(sender.isOn, animated: true)
if sender.isOn {
tv.delegate?.tableView?(tv, didSelectRowAt: ip)
} else {
tv.delegate?.tableView?(tv, didDeselectRowAt: ip)
}
}
}
而且在您的代表处
func tableView(_ tableView: UITableView, shouldHighlightRowAt indexPath: IndexPath) -> Bool {
return false // to disable interaction since it happens on the switch
}
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell { // to make sure it is rendered correctly when dequeuing:
// stuff
if isSelected { // stored value to know if the switch is on or off
tableView.selectRow(at: indexPath, animated: true, scrollPosition: .none)
} else {
tableView.deselectRow(at: indexPath, animated: true)
}
// more stuff
}
func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
// do your thing when selecting
}
func tableView(_ tableView: UITableView, didDeselectRowAt indexPath: IndexPath) {
// do your thing when deselecting
}