Question

我有一个Xcode 5按钮问题。

我在UIViewController上以编程方式创建了一些按钮，然后想要在这些按钮上注册点击。我使用NSLog来跟踪点击次数，但似乎没有在日志中注册任何点击。

有人可以帮忙吗？

最终目标是在每次点击按钮时转到下一个UIViewController，但只是测试是否首先注册按钮点击。

以下是我在viewDidLoad中创建按钮的方法（仅显示1个）。注意：if-statement仅用于检查在上一个视图中按下了哪些按钮。

- (void)viewDidLoad
{
    [super viewDidLoad];
// Do any additional setup after loading the view.

    NSString *myString = [NSString stringWithFormat:@"%d", self.tagNumber ];

    if (self.tagNumber == 1)
    {
        hotelButton = [UIButton buttonWithType:UIButtonTypeCustom];
        hotelButton.tag = 1;
        hotelButton.frame = CGRectMake(60, 60, 300.f, 100.f);

        UIImage *buttonImage1 = [UIImage imageNamed:@"buttonImage1.png"];
        [hotelButton setBackgroundImage:buttonImage1 forState:UIControlStateNormal];
        [self.view addSubview:hotelButton];

        // Add targets and actions
        [hotelButton addTarget:self action:@selector(buttonClicked) forControlEvents:UIControlEventTouchUpOutside];
    }

}

以下是我检查按钮点击的方法

- (void) buttonClicked
{
    NSLog(@"Button %i clicked", hotelButton.tag);
}

注意：我也尝试了以下内容：

- (void) buttonClicked:(UIButton *) button
{
    NSLog(@"Button %ld clicked", (long int)[button tag]);
}

但是在我的buttonClicked指向action @ selector时出现错误“未声明的选择器viewDidLoad”：

[hotelButton addTarget:self action:@selector(buttonClicked) forControlEvents:UIControlEventTouchUpOutside];

Answer 1

使用此：

[hotelButton addTarget:self action:@selector(buttonClicked) 
    forControlEvents:UIControlEventTouchUpInside];

来自Apple Docs：

UIControlEventTouchUpInside
A touch-up event in the control where the finger is inside the bounds of the control.

UIControlEventTouchUpOutside
A touch-up event in the control where the finger is outside the bounds of the control

并保持这种方法：

- (void) buttonClicked
{
    NSLog(@"Button %i clicked", hotelButton.tag);
}

Answer 2

试试这个，

[hotelButton addTarget:self action:@selector(buttonClicked:) forControlEvents:UIControlEventTouchUpInside];

并传递发件人，

- (void) buttonClicked:(UIButton*)sender
{
    NSLog(@"Button %i clicked", [sender tag]);
}

Answer 3

尝试从外到内改变，

[hotelButton addTarget:self action:@selector(buttonClicked:) forControlEvents:UIControlEventTouchUpInside];

Answer 4

修改了你的if条件。请遵循： -

if (self.tagNumber == 1)
    {
        hotelButton = [UIButton buttonWithType:UIButtonTypeCustom];
        hotelButton.tag = 1;
        hotelButton.frame = CGRectMake(60, 60, 300.f, 100.f);

        UIImage *buttonImage1 = [UIImage imageNamed:@"buttonImage1.png"];
        [hotelButton setBackgroundImage:buttonImage1 forState:UIControlStateNormal];
hotelButton.showsTouchWhenHighlighted = YES;
hotelButton.imageEdgeInsets = UIEdgeInsetsMake(10, 10, 10, 10);
        [hotelButton addTarget:self action:@selector(buttonClicked) forControlEvents:UIControlEventTouchUpInside];
        [self.view addSubview:hotelButton];

    }

按钮单击未注册

4 个答案: