ios - 当我们点击它时，如何更改添加到表格 View 单元格上的按钮背景颜色？

Question

我在 tableview 单元格上添加了一个自定义按钮，一切正常。

但这里我的主要要求是，当我“第一次”单击添加到表格 View 单元格上的那个按钮时，按钮背景颜色需要更改(变为红色)，当我第二次单击该按钮时，需要显示之前的颜色(变回白色)

我的代码:

#import "ViewController2.h"

@interface ViewController2 ()
{
    NSArray * Mainarray;
    UITableView * MaintableView;
    UIImageView * accessoryView;
    UIButton *button;
    BOOL tapped;
}

@end

@implementation ViewController2

- (void)viewDidLoad
{
    [super viewDidLoad];

    tapped = NO;

    Mainarray = [[NSArray alloc]initWithObjects:@"Ram",@"Rama",@"Rakesh",@"Ranjith", nil];

    self.view.backgroundColor = [UIColor darkGrayColor];
    MaintableView = [[UITableView alloc]init];
    MaintableView.translatesAutoresizingMaskIntoConstraints = NO;
    MaintableView.tableFooterView = [[UIView alloc] initWithFrame:CGRectZero];
    MaintableView.dataSource=self;
    MaintableView.delegate=self;
    MaintableView.autoresizingMask = UIViewAutoresizingFlexibleHeight | UIViewAutoresizingFlexibleWidth;
    [MaintableView registerClass:[UITableViewCell class] forCellReuseIdentifier:@"Cell"];
    [self.view addSubview:MaintableView];

    NSDictionary * views = NSDictionaryOfVariableBindings(MaintableView);

    NSArray * horizentalConstraint = [NSLayoutConstraint constraintsWithVisualFormat:@"H:|-0-[MaintableView]-0-|" options:0 metrics:nil views:views];

    NSArray * verticalConstraint = [NSLayoutConstraint constraintsWithVisualFormat:@"V:|-0-[MaintableView]-0-|"options:0 metrics:nil views:views];

    [self.view addConstraints:horizentalConstraint];
    [self.view addConstraints:verticalConstraint];
}

- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView {

    return 1;
}

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {

    return Mainarray.count;
}

-(CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath{
    return 50;
}

-(UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
    static NSString *CellIdentifier = @"Cell";

    UITableViewCell *Cell = [MaintableView dequeueReusableCellWithIdentifier:CellIdentifier forIndexPath:indexPath];

    if (Cell == nil)
    {
        Cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier];
    }

    Cell.textLabel.text = [Mainarray objectAtIndex:indexPath.row];

    button=[UIButton buttonWithType:UIButtonTypeRoundedRect];
    button.tag=indexPath.row;
    [button addTarget:self
               action:@selector(aMethod:) forControlEvents:UIControlEventTouchDown];
    [button setTitle:@"" forState:UIControlStateNormal];
    button.frame = CGRectMake(Cell.frame.size.width - 50, 10, 30, 30);

    button.layer.cornerRadius = 60/2.0f;
    button.layer.borderColor=[UIColor blackColor].CGColor;
    button.backgroundColor = [UIColor whiteColor];
    button.layer.borderWidth=2.0f;


    //setting tag to button
    button.tag=indexPath.row;

    [Cell.contentView addSubview:button];

    return Cell;
}

-(void)aMethod :(id)sender
{
    CGPoint buttonPosition = [sender convertPoint:CGPointZero toView:MaintableView];
    NSIndexPath *indexPath1 = [MaintableView indexPathForRowAtPoint:buttonPosition];
    NSInteger variable = indexPath1.row;
    NSLog(@"ok it is %ld",(long)variable);

    if(button.tag == variable){

        button.backgroundColor= tapped ? [UIColor whiteColor]:[UIColor redColor];
        tapped = YES;
    }
}

-(void)tableView:(UITableView *)tableView willDisplayCell:(UITableViewCell *)cell forRowAtIndexPath:(NSIndexPath *)indexPath
{
    if ([cell respondsToSelector:@selector(setSeparatorInset:)]) {
        [cell setSeparatorInset:UIEdgeInsetsZero];
    }
    if ([cell respondsToSelector:@selector(setPreservesSuperviewLayoutMargins:)]) {
        [cell setPreservesSuperviewLayoutMargins:NO];
    }
    if ([cell respondsToSelector:@selector(setLayoutMargins:)]) {
        [cell setLayoutMargins:UIEdgeInsetsZero];
    }
}
@end

Answer 1

您可以创建一个数组，您可以在其中存储选定的按钮。示例:

var selectedButtons: [Bool] = [Bool](count: N, repeatedValue: false)

在您的 cellForRowAtIndexPath 中:

if selectedButtons[indexPath.row] {
     yourButton.backgroundColor = UIColor.redColor()
} else {
     yourButton.backgroundColor = UIColor.whiteColor()
}

然后在你的 tableView didSelectRowAtIndexPath 中你可以说:

selectedButtons[indexPath.row] = true
tableView.reloadData()

抱歉，我的代码是用 Swift 编写的，但将它转换为 Obj-C 并不难。