我有一个带有一个UISwitch for row的UITableView。要做到这一点:
UISwitch *switchController = [[UISwitch alloc] initWithFrame:CGRectZero];
if([valor isEqualToString:@"true"])
[switchController setOn:YES animated:YES];
else
[switchController setOn:NO animated:YES];
switchController.tag = row;
[switchController addTarget:self action:@selector(switchChanged:) forControlEvents:UIControlEventValueChanged];
cell.accessoryView = switchController;
[switchController release];
好的,我想要独家排,当我触摸一个UISwitch时,我需要将所有其他UISwitch置于OFF状态。 但我不能这样做......有人可以帮助我吗?
谢谢朋友们。
-(void) switchChanged:(id)sender{
UISwitch *switchController = sender;
}
答案 0 :(得分:1)
一种简单的方法可能就是这样。
您希望该用户一次只能打开一行。为此,您需要先跟踪两个开关(我们可以通过单元的附件视图访问它)和第二个开启的开关。(对于这个假设我们使用标签属性)。
So we will need:
>One variable to keep track of which row's switch is on.
>Array which will hold the of the switches.
我已经使用以下代码创建了一个示例应用程序:(我将行数作为常量变为10)
<强>代码强>
SwitchTableController.h
#import <UIKit/UIKit.h>
#define NUMBER_OF_ROWS 10
@interface SwitchTableController : UITableViewController {
int selectedSwitchRow;
NSMutableArray *switchArray;
}
@end
SwitchTableController.m代码
#import "SwitchTableController.h"
@implementation SwitchTableController
#pragma mark -
#pragma mark View lifecycle
- (void)dealloc {
[switchArray release];
[super dealloc];
}
- (void)viewDidLoad {
[super viewDidLoad];
selectedSwitchRow = -1;
if (switchArray == nil)
{
switchArray = [[NSMutableArray alloc] initWithCapacity:10];
}
for (int i=0; i<NUMBER_OF_ROWS; i++)
{
UISwitch *switchController = [[UISwitch alloc] initWithFrame:CGRectZero];
[switchController setOn:NO animated:YES];
switchController.tag = i;
[switchController addTarget:self action:@selector(switchChanged:) forControlEvents:UIControlEventValueChanged];
[switchArray addObject:switchController];
[switchController release];
}
}
#pragma mark -
#pragma mark Table view data source
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView {
return 1;
}
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {
return NUMBER_OF_ROWS;
}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
static NSString *CellIdentifier = @"Cell";
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
if (cell == nil)
{
cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier] autorelease];
}
cell.accessoryView = [switchArray objectAtIndex:indexPath.row];
return cell;
}
-(void) switchChanged:(UISwitch *)sender
{
if (selectedSwitchRow >= 0 && selectedSwitchRow<[switchArray count] && selectedSwitchRow != sender.tag)
{
UISwitch *tempSwitch = [switchArray objectAtIndex:selectedSwitchRow];
[tempSwitch setOn:NO animated:YES];
[self.tableView reloadData];
}
selectedSwitchRow = sender.tag;
}