ios - 更改自定义表格 View 单元格的图像

Question

我的情况: 我制作了一个名为:BestQuestionListCell 的自定义单元格，并在 BestQuestionListViewController 中创建了一个tableview。在 BestQuestionListCell 中，我在左侧添加了一个按钮。我在 按钮 上设置图像。现在，当我点击单元格时，按钮 的图像确实发生了变化。现在我想在 View 显示时将这些单元格之一设置为选中状态。

我尝试设置按钮的图像，我还尝试将单元格设置为选中状态。他们都没有工作。

UISreenShot : The screenshot of BestQuestionListViewController

这里是tableViewcell的代码。

@implementation BestQuestionListCell
@synthesize questionLabel;
@synthesize authorLabel;
@synthesize ownerButton;
@synthesize starButton;

- (void)awakeFromNib {
    [super awakeFromNib];
    // Initialization code
}

- (void)setSelected:(BOOL)selected animated:(BOOL)animated {
    NSLog(@"I am selected! %@",selected?@"yes":@"no");
//    [super setSelected:selected animated:animated];
    if (selected) {
        [self.starButton setImage:[UIImage imageNamed:@"Fstar"] forState:UIControlStateNormal];
    }else{
        [self.starButton setImage:[UIImage imageNamed:@"Star"] forState:UIControlStateNormal];
    }
}

- (void)setButtonImage:(UIImage *)buttonImage{
    _buttonImage = buttonImage;
    [self.starButton setImage:[UIImage imageNamed:@"Fstar"] forState:UIControlStateNormal];
    [self setNeedsLayout];
    NSLog(@"nothing happened? %@",buttonImage);
}

这是表格 View 。

-(UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath{
    NSString *cellIdentifer = @"BestQuestionListCell";
    BestQuestionListCell *mainCell = (BestQuestionListCell *)[self.bestQuestionListTableView dequeueReusableCellWithIdentifier:cellIdentifer];

    if(mainCell == nil) {
        mainCell = [[[NSBundle mainBundle] loadNibNamed:cellIdentifer owner:self options:nil] firstObject];
    }

    if ( [DataSession sharedSession].subQuestionArray.count > 0) {
        mainCell.questionLabel.text = [[DataSession sharedSession].subQuestionArray[indexPath.row] question_content];
        mainCell.questionLabel.textColor = [UIColor colorWithRed:74/255.0f green:74/255.0f blue:74/255.0f alpha:1.0f];
        mainCell.questionLabel.backgroundColor = [UIColor whiteColor];
                mainCell.selectionStyle = UITableViewCellSelectionStyleNone;

    }
    return mainCell;
}

我什么都没做

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath

我尝试了这三种方法来解决这个问题，但没有奏效。

[mainCell setButtonImage:[UIImage imageNamed:@"Fstar"]];
[mainCell.starButton setImage:[UIImage imageNamed:@"Fstar"] forState:UIControlStateNormal];
[mainCell setSelected:YES animated:YES];

Answer 1

根据您在下面编辑的问题是代码工作。我已经完成了代码注释，以便您可以正确理解代码，如果您仍然有问题可以询问。

#import "BestQuestionListVC.h"
#import "BestQuestionListCell.h"

@interface BestQuestionListVC () <UITableViewDelegate, UITableViewDataSource>{
    NSArray *arrQuesList;
    NSArray *arrAuthorList;
    NSMutableArray *arrMutBtnSelected; // arrMut of bools, containing true/false of button as selected or not.

}

@property (strong, nonatomic) IBOutlet UITableView *tblBestQuestion;


@end

@implementation BestQuestionListVC

- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view.

    // creating temp array of data
    arrQuesList     = @[@"ques #1", @"ques #2", @"ques #3", @"ques #4", @"ques #5", @"ques #6", @"ques #7", @"ques #8" ];
    arrAuthorList   = @[@"Author #1", @"Author #2", @"Author #3", @"Author #4", @"Author #5", @"Author #6", @"Author #7", @"Author #8" ];

    arrMutBtnSelected = [NSMutableArray new];  // alloc Mutable array

    // array of bools, initially all false as not any button is selected
    for (int i=0; i < arrQuesList.count; i++) {
        [arrMutBtnSelected addObject:[NSNumber numberWithBool:false]];
    }

    // for initially first button is selected.
    [arrMutBtnSelected replaceObjectAtIndex:0 withObject:[NSNumber numberWithBool:true]];

}

- (void)didReceiveMemoryWarning {
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

- (IBAction)btnStarClicked:(UIButton *)sender {
    // If one button is selected at one time
    // start
    /*
         [arrMutBtnSelected removeAllObjects];
         for (int i=0; i < arrQuesList.count; i++) {
         [arrMutBtnSelected addObject:[NSNumber numberWithBool:false]];
         }
         [arrMutBtnSelected replaceObjectAtIndex:sender.tag withObject:[NSNumber numberWithBool:true]];
    */
    // end

    // if user can selects multiple buttons
    // start
    /*
        if (sender.selected) {
            [arrMutBtnSelected replaceObjectAtIndex:sender.tag withObject:[NSNumber numberWithBool:false]];
        }
        else{
            [arrMutBtnSelected replaceObjectAtIndex:sender.tag withObject:[NSNumber numberWithBool:true]];
    }
    */
    // end

    [self.tblBestQuestion reloadData];
}


#pragma mark - TableViewDelegate

-(CGFloat)tableView:(UITableView *)tableView estimatedHeightForRowAtIndexPath:(NSIndexPath *)indexPath{
    return UITableViewAutomaticDimension;
}

-(CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath{
    return UITableViewAutomaticDimension;
}

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section{
    return arrQuesList.count;
}


- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath{
    BestQuestionListCell *quesCell = [tableView dequeueReusableCellWithIdentifier:@"BestQuestionListCell"];

    quesCell.lblQuestion.text   = arrQuesList[indexPath.row];
    quesCell.lblAuthor.text     = arrAuthorList[indexPath.row];
    quesCell.btnStar.tag = indexPath.row ;

    if (arrMutBtnSelected[indexPath.row] == [NSNumber numberWithBool:true]) {
        quesCell.btnStar.selected = true;
    }
    else{
        quesCell.btnStar.selected = false;
    }

    return quesCell;
}

@end

输出:

最初在项目运行时:

如果用户一次选择一个按钮，则输出:

如果用户选择任何多个按钮的输出