UIButton-编程创建问题

Question

编程创建了UIButton：

- (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");
}

什么也没输出，Button没创建成功。

但是同样方法创建UITextField就成功了。

谢谢，请指点

Answer 1

在初始化语句之后要给Button设置框架，用不同方式命名Button。

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];