ios - 如何发送方法以从 UIButton 调用的操作中查看

Question

我理解(我认为)为什么这不起作用，但我不知道如何让它起作用。

我有一个在 viewWillAppear 中调用的方法(为了这个问题我简化了代码):

- (void)viewWillAppear:(BOOL)animated
{
        [self displayHour:0];
}

然后我有一个小的 for 循环，在 viewDidLoad 中构建一些按钮:

NSUInteger b = 0;

for (UIButton *hourButton in hourButtons) {
    [hourButton setTag:b];
    [hourButton setTitle:[NSString stringWithFormat:@"%lu", (unsigned long)b] forState:UIControlStateNormal];
    [hourButton addTarget:self action:@selector(showHour:) forControlEvents:UIControlEventTouchUpInside];

    b++;
}

然后我有这个 Action :

- (IBAction)showHour:(id)sender
{
        // Logs 0, 1, etc. depending on which button is tapped
    NSLog(@"Button tag is: %lu", (long int)[sender tag]); 

    // This currently throws this error:
    // No visible @interface for 'UIView' declares the selector 'displayHour:'

    // What I want to do is be able to call this method on
    // the main view and pass along the button tag of the 
    // button that was tapped.
    [mainView displayHour:(long int)[sender tag]];
}

问题 是如何从 showHour: 操作将 displayHour 调用到主视图？

如果你需要它，displayHour 方法看起来像这样(简化，基本上更新主视图上的一些标签和 ImageView ):

- (void)displayHour:(NSUInteger)i
{    
    // The temperature
    hourTemp = [[hourly objectAtIndex:i] valueForKeyPath:@"temperature"];

    // The icon
    hourIcon = [[hourly objectAtIndex:i] valueForKeyPath:@"icon"];

    // The precipitation
    hourPrecip = [[hourly objectAtIndex:i] valueForKeyPath:@"precipProbability"];

    // SET DISPLAY
    [hourTempField setText:hourTemp];
    [hourIconFrame setImage:hourIcon];
    [hourPrecipField setText:hourPrecip];
}

谢谢!

Answer 1

代替

   [mainView displayHour:(long int)[sender tag]];

做:

   [self displayHour:(long int)[sender tag]];