Question

我正在以编程方式创建UIButton，如下所示。

- (void)viewDidLoad
{
    [paymentsHomeView setFrame:CGRectMake(0, 0, 320, 520)]; // paymentsHomeView is added and referenced in IB

    UIButton *paymentButton = [[UIButton alloc] initWithFrame:CGRectMake(10, 45, 300, 41)];
    paymentButton.titleLabel.text = @"Button";
    paymentButton = [UIButton buttonWithType:UIButtonTypeRoundedRect];
    [paymentButton addTarget:self action:@selector(buttonClicked:) forControlEvents:UIControlEventTouchUpInside];
    [self.paymentsHomeView addSubview:paymentButton];

    [super viewDidLoad];
}

-(void) buttonClicked {

    NSLog(@"buttonClicked");
}

上述代码没有输出。该按钮未创建。

当我创建UITextField时，同样有效。

帮帮我。在此先感谢..！

Answer 1

你需要在init语句后设置按钮的框架，你需要以不同的方式设置按钮的标题

UIButton *button = [UIButton buttonWithType:UIButtonTypeRoundedRect];
[button addTarget:self 
           action:@selector(buttonClicked:)
 forControlEvents:UIControlEventTouchDown];
[button setTitle:@"Button" forState:UIControlStateNormal];
button.frame = CGRectMake(80.0, 210.0, 160.0, 40.0);
[self.view addSubview:button];

Answer 2

试试这个我的朋友..

UIButton *paymentButton = [UIButton buttonWithType:UIButtonTypeRoundedRect];
[paymentButton addTarget:self 
       action:@selector(aMethod:)
forControlEvents:UIControlEventTouchDown];
[paymentButton setTitle:@"Show View" forState:UIControlStateNormal];
 paymentButton.frame = CGRectMake(80.0, 210.0, 160.0, 40.0);
[self.paymentsHomeView addSubview:paymentButton];

告诉我工作与否...... !!!

快乐编码!!!!

Answer 3

您正在此处创建按钮：

UIButton *paymentButton = [[UIButton alloc] initWithFrame:CGRectMake(10, 45, 300, 41)];

再次在这一行上你创建另一个按钮，这样就覆盖了前一个按钮，所以你需要再次设置框架：

paymentButton = [UIButton buttonWithType:UIButtonTypeRoundedRect];

我建议这样做：

 paymentButton = [UIButton buttonWithType:UIButtonTypeRoundedRect];
[paymentButton setFrame:CGRectMake(10, 45, 300, 41)];

    paymentButton.titleLabel.text = @"Button";
    [paymentButton addTarget:self action:@selector(buttonClicked:) forControlEvents:UIControlEventTouchUpInside];
    [self.paymentsHomeView addSubview:paymentButton];

Answer 4

我在这里注意到一些问题：

[paymentsHomeView setFrame:CGRectMake(0, 0, 320, 520)]; // paymentsHomeView is added and referenced in IB

UIButton *paymentButton = [[UIButton alloc] initWithFrame:CGRectMake(10, 45, 300, 41)];
paymentButton.titleLabel.text = @"Button";
// You just allocated a paymentButton above. Without ARC it is leaked here:
paymentButton = [UIButton buttonWithType:UIButtonTypeRoundedRect];
// Now you have assigned an auto released button to paymentButton. It does not have a frame or text.
[paymentButton addTarget:self action:@selector(buttonClicked:) forControlEvents:UIControlEventTouchUpInside];
[self.paymentsHomeView addSubview:paymentButton];

试试这个：

UIButton *paymentButton = [UIButton buttonWithType:UIButtonTypeRoundedRect];
paymentButton.frame = CGRectMake(10, 45, 300, 41);
paymentButton.titleLabel.text = @"Button";
[paymentButton addTarget:self action:@selector(buttonClicked:) forControlEvents:UIControlEventTouchUpInside];
[self.paymentsHomeView addSubview:paymentButton];

Answer 5

对于自定义按钮，请使用以下代码...

删除此行

paymentButton = [UIButton buttonWithType:UIButtonTypeRoundedRect];

并添加此行，显示带有黑色背景的按钮

paymentButton.titleLabel.textColor = [UIColor whiteColor];// set text color which you want
[paymentButton setBackgroundColor:[UIColor blackColor]];// set back color which you want

对于RoundRect Button，请使用以下代码

    UIButton *paymentButton = [UIButton buttonWithType:UIButtonTypeRoundedRect];
    paymentButton.frame = CGRectMake(10, 45, 300, 41);
    paymentButton.titleLabel.text = @"Button";
    [paymentButton addTarget:self action:@selector(buttonClicked:) forControlEvents:UIControlEventTouchUpInside];
    [self.paymentsHomeView addSubview:paymentButton];
    [self.paymentsHomeView bringSubviewToFront:paymentButton];

UIButton - 程序化创建问题

5 个答案: