添加按钮到UITableViewCell

Question

我想在一个按钮中添加一个按钮UITableViewCell.这是我的代码:`

if (indexPath.row==2) {
    UIButton *scanQRCodeButton = [[UIButton alloc]init];

    scanQRCodeButton.frame = CGRectMake(0.0f, 5.0f, 320.0f, 44.0f);
    scanQRCodeButton = [UIButton buttonWithType:UIButtonTypeRoundedRect];
    scanQRCodeButton.backgroundColor = [UIColor redColor];
    [scanQRCodeButton setTitle:@"Hello" forState:UIControlStateNormal];

    [cell addSubview:scanQRCodeButton];
}`

现在,当我运行应用程序时,我只看到一个空行!有任何想法吗 ？

Answer 1

虽然将它放在单元格的contentView中是很自然的,但我确信这不是问题(实际上,在过去,我从来没有在contentView中正确显示子视图,所以我总是使用单元格).

无论如何,问题涉及到开始创建按钮时的前三行.前两行很好,但代码停止使用:

scanQRCodeButton = [UIButton buttonWithType:UIButtonTypeRoundedRect];

buttonWithType:实际上是一种创建按钮的便捷方法(它就像一个紧凑的alloc-init).因此,它实际上"消除"了你过去的两行(你基本上创建了两次按钮).您只能使用init或buttonWithType:作为相同的按钮,但不能同时使用两者.

UIButton *scanQRCodeButton = [UIButton buttonWithType:UIButtonTypeRoundedRect];
scanQRCodeButton.frame = CGRectMake(0.0f, 5.0f, 320.0f, 44.0f);
scanQRCodeButton.backgroundColor = [UIColor redColor];
[scanQRCodeButton setTitle:@"Hello" forState:UIControlStateNormal];    
[cell addSubview:scanQRCodeButton];

这将工作(请注意,如果需要,您可以使用cell.contentView).如果您没有使用自动引用计数(ARC),我想提一下,您不必在内存管理方面做任何事情,因为buttonWithType:返回一个自动释放的按钮.

Answer 2

    UIButton *deletebtn=[[UIButton alloc]init];
            deletebtn.frame=CGRectMake(50, 10, 20, 20);
            deletebtn = [UIButton buttonWithType:UIButtonTypeRoundedRect];
            [deletebtn setImage:[UIImage imageNamed:@"log_delete_touch.png"] forState:UIControlStateNormal];
            [deletebtn addTarget:self action:@selector(DeleteRow:) forControlEvents:UIControlEventTouchUpInside];
            [cell.contentView addSubview:deletebtn];

要么

//在项目UIButton + EventBlocks中下载类并导入

UIButton *deletebtn=[UIButton buttonWithType:UIButtonTypeRoundedRect];
[deletebtn setFrame:CGRectMake(170,5, 25, 25)];
deletebtn.tag=indexPath.row;
[deletebtn setImage:[UIImage imageNamed:@"log_delete_touch.png"] forState:UIControlStateNormal];
[deletebtn setOnTouchUpInside:^(id sender, UIEvent *event) {


  //Your action here
}];
[cell addSubview:deletebtn];