UIButton - 程序化创建问题答案

【问题标题】：UIButton - Programmatic creation issueUIButton - 程序化创建问题
【发布时间】：2012-12-05 06:32:35
【问题描述】：

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");
}

上面的代码没有输出。未创建按钮。

而当我创建 UITextField 时同样有效。

帮帮我。提前谢谢..！

【问题讨论】：

评论这个并运行它会起作用 paymentButton = [UIButton buttonWithType:UIButtonTypeRoundedRect];并确保将您的 paymentHomeView 添加到 self.view
另外你为什么在你的“viewDidLoad”方法中在一行中引用“paymentsHomeView”，然后在另一行中引用“self. paymentsHomeView”？
始终将[super viewDidLoad]; 作为方法的第一行。除非在 dealloc 中，否则 super 调用应该是第一个调用。

标签： iphone objective-c ios ios5 uibutton

【解决方案1】：

您需要在 init 语句之后为按钮设置框架，并且您需要以不同的方式为按钮设置标题

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];

【讨论】：

谢谢你..！像魅力一样工作..！

【解决方案2】：

我的朋友试试这个..

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];

让我知道它是否有效...！！！

编码愉快！！！！

【讨论】：

【解决方案3】：

您正在这里创建按钮：

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

再次在这一行创建另一个按钮，这样会覆盖前一个按钮，因此您需要再次设置框架：

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];

【讨论】：

【解决方案4】：

我在这里指出了一些问题：

[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];

【讨论】：

【解决方案5】：

对于自定义按钮，请使用以下代码...

删除这一行

paymentButton = [UIButton buttonWithType:UIButtonTypeRoundedRect];

并添加显示黑色背景按钮的这一行

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

对于 RoundRect 按钮使用下面的代码

    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];

【讨论】：