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标题: ios - 如何从 UIButton 调用的操作发送方法以查看 [打印本页]

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作者: 菜鸟教程小白    时间: 2022-12-12 15:23
标题: ios - 如何从 UIButton 调用的操作发送方法以查看

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。

我有一个像这样在 viewWillAppear 中调用的方法(为了这个问题，我已经简化了代码):

- (void)viewWillAppearBOOL)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 actionselector(showHour forControlEvents:UIControlEventTouchUpInside];

    b++;
}

那么对于我的操作:

- (IBAction)showHourid)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 displayHourlong int)[sender tag]];
}

问题是如何从 showHour: Action 调用 displayHour 到主视图？

如果需要，displayHour方法长这样(简化了，基本更新了主视图上的一些标签和图片 View ):

- (void)displayHourNSUInteger)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!

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Best Answer-推荐答案

代替

   [mainView displayHourlong int)[sender tag]];

做:

   [self displayHourlong int)[sender tag]];

关于ios - 如何从 UIButton 调用的操作发送方法以查看，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/19203281/

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