Iphone 滚动期间设置UITableViewCell按钮图像值

我遇到一个问题，我试图保存一个重复图像是否显示选中（它是在IB中创建的

UITableViewCell

上创建的

UIButton

）

问题是，由于单元格被随机重复使用，图像在开始滚动后会被重置或设置在其他地方。我看了所有的地方，建议是设置一个

NSMutableArray

来存储按钮的选择状态，我正在一个名为

checkRepeatState

我的问题是：如果返回视图的给定单元格的

checkRepeatState

设置为0或1，我应该将if-then-else语句放在代码中的什么位置，使其实际更改按钮图像？现在，我使用的if-then-else语句在按钮图像进入视图时对其完全没有影响。在这一点上我很困惑

提前感谢您提供的任何见解

我的代码如下：

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{   
// set up the cell

static NSString *CellIdentifier = @"PlayerCell";

PlayerCell *cell = (PlayerCell *)[tableView dequeueReusableCellWithIdentifier:CellIdentifier];

if (!cell) {

    [[NSBundle mainBundle] loadNibNamed:@"PlayerNibCells" owner:self options:nil];
    cell = tmpCell;
    self.tmpCell = nil;

    NSLog(@"Creating a new cell");

}

// Display dark and light background in alternate rows -- see tableView:willDisplayCell:forRowAtIndexPath:.
cell.useDarkBackground = (indexPath.row % 2 == 0);

// Configure the data for the cell.

NSDictionary *dataItem = [soundCategories objectAtIndex:indexPath.row];
UILabel *label;
label = (UILabel *)[cell viewWithTag:1];
label.text = [dataItem objectForKey:@"AnimalName"];

label = (UILabel *)[cell viewWithTag:2];    
label.text = [dataItem objectForKey:@"Description"];

UIImageView *img;
img = (UIImageView *)[cell viewWithTag:3];
img.image = [UIImage imageNamed:[dataItem objectForKey:@"Icon"]];

NSInteger row = indexPath.row;
NSNumber *checkValue = [checkRepeatState objectAtIndex:row];
NSLog(@"checkValue is %d", [checkValue intValue]);
// Reusing cell; make sure it has correct image based on checkRepeatState value
UIButton *repeatbutton = (UIButton *)[cell viewWithTag:4];

if ([checkValue intValue] == 1) {
    NSLog(@"repeatbutton is selected");
    [repeatbutton setImage:[UIImage imageNamed:@"repeatselected.png"] forState:UIControlStateSelected];
    [repeatbutton setNeedsDisplay];
} else {
    NSLog(@"repeatbutton is NOT selected");
    [repeatbutton setImage:[UIImage imageNamed:@"repeat.png"] forState:UIControlStateNormal];
    [repeatbutton setNeedsDisplay];
}   

cell.accessoryType = UITableViewCellAccessoryNone;

return cell;
}

---

您是否也将按钮状态设置为“已选定”？如果您只希望按钮显示不同的图像，请使用

uicontrolstatemormal

。如果您同时设置了普通图像和选定图像，则只需使用

repeatbutton.selected=YES

设置选定状态即可。您只想在drawnonward的帮助下共享工作代码。。再次感谢！希望其他人能从这个代码中得到帮助

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{   
// set up the cell
static NSString *CellIdentifier = @"PlayerCell";

PlayerCell *cell = (PlayerCell *)[tableView dequeueReusableCellWithIdentifier:CellIdentifier];

if (!cell) {

    [[NSBundle mainBundle] loadNibNamed:@"PlayerNibCells" owner:self options:nil];
    cell = tmpCell;
    self.tmpCell = nil;

    NSLog(@"Creating a new cell");

            // this will setup the button images for each state initially to be changed later

    UIButton *repeatbutton;
    repeatbutton = (UIButton *)[cell viewWithTag:4];
    [repeatbutton setImage:[UIImage imageNamed:@"repeat.png"] forState:UIControlStateNormal];
    [repeatbutton setImage:[UIImage imageNamed:@"repeatselected.png"] forState:UIControlStateSelected];

}

// Display dark and light background in alternate rows -- see tableView:willDisplayCell:forRowAtIndexPath:.
cell.useDarkBackground = (indexPath.row % 2 == 0);

// Configure the data for the cell... this gets called when the row scrolls into view each and every time

NSDictionary *dataItem = [soundCategories objectAtIndex:indexPath.row];
UILabel *label;
label = (UILabel *)[cell viewWithTag:1];
label.text = [dataItem objectForKey:@"AnimalName"];

label = (UILabel *)[cell viewWithTag:2];    
label.text = [dataItem objectForKey:@"Description"];

UIImageView *img;
img = (UIImageView *)[cell viewWithTag:3];
img.image = [UIImage imageNamed:[dataItem objectForKey:@"Icon"]];

NSInteger row = indexPath.row;
NSNumber *checkValue = [checkRepeatState objectAtIndex:row];
NSLog(@"checkValue is %d", [checkValue intValue]);
// Reusing cell; make sure it has correct image based on checkRepeatState value
UIButton *repeatbutton = (UIButton *)[cell viewWithTag:4];

if ([checkValue intValue] == 1) {
    NSLog(@"repeatbutton is selected");
    [repeatbutton setSelected:YES];
} else {
    NSLog(@"repeatbutton is NOT selected");
    [repeatbutton setSelected:NO];
}   

cell.accessoryType = UITableViewCellAccessoryNone;

return cell;
}

我的repeat button函数被调用：

- (void)repeatButton:(UIButton *)sender {

NSIndexPath *indexPath = [self.tableView indexPathForCell:(UITableViewCell *)[[sender superview] superview]];
NSInteger row = indexPath.row;

// method for finding what button was pressed and changing the button image for repeat on/off

UITableViewCell *cell = (UITableViewCell*)[[sender superview] superview];

UIButton *repeatbutton;
repeatbutton = (UIButton *)[cell viewWithTag:4];

if ([sender isSelected]) {
    [checkRepeatState replaceObjectAtIndex:row withObject:[NSNumber numberWithBool:NO]];
    [sender setSelected:NO];
} else {
    [checkRepeatState replaceObjectAtIndex:row withObject:[NSNumber numberWithBool:YES]];
    [sender setSelected:YES];
}       

}

---

我在iAction中为另一个函数中的其他位置的按钮设置该值（我还在可变数组中设置了一个选定值）。这与UITableViewCell的重用有关，而与按钮状态是否选中无关。当表格视图单元格进入视图时，无论选择状态如何，图像都是随机的repeat.png或repeatselected.png，这取决于单元格是否从另一个单元格重新使用。您应该能够在nib中设置正常和选定的图像，只需在

tableView:cellforrowatinexpath:

中设置所选状态，或者忽略所选状态并始终将图像设置为正常状态。由于您没有还原选定的状态，因此两个图像都可能显示。明白了，我在viewDidLoad中设置了不同的图像，效果很好。但是，当我尝试设置“选定”或“未选定”时，它会根据重复使用tableview单元格的方式错误地显示图像。NSLogs正确地告诉我它是否为选定状态。我真正的问题是，如果他们在表格视图中选择了许多“重复”按钮中的一个，然后向下滚动到视图外，重复按钮图像就不会保持不变，因为单元格重复使用。这正是我想弄明白的。如何重置单元格或使其在单元格返回视图后正确设置图像。您的提示让我明白了这一点！它工作！！！谢天谢地。。。我会发布下面的工作代码，并给你信用，再次感谢！

- (void)repeatButton:(UIButton *)sender {

NSIndexPath *indexPath = [self.tableView indexPathForCell:(UITableViewCell *)[[sender superview] superview]];
NSInteger row = indexPath.row;

// method for finding what button was pressed and changing the button image for repeat on/off

UITableViewCell *cell = (UITableViewCell*)[[sender superview] superview];

UIButton *repeatbutton;
repeatbutton = (UIButton *)[cell viewWithTag:4];

if ([sender isSelected]) {
    [checkRepeatState replaceObjectAtIndex:row withObject:[NSNumber numberWithBool:NO]];
    [sender setSelected:NO];
} else {
    [checkRepeatState replaceObjectAtIndex:row withObject:[NSNumber numberWithBool:YES]];
    [sender setSelected:YES];
}       

}