Question

我以编程方式生成了UIButtons，它们共享相同的选择器方法。当方法运行时，我希望方法知道按下了哪个按钮，然后能够加载相应的UIViewController。

-(void)buildButtons
{
    for( int i = 0; i < 5; i++ ) {
    UIButton* aButton = [UIButton buttonWithType:UIButtonTypeRoundedRect];
    [aButton setTag:i];
    [aButton addTarget:self action:@selector(buttonClicked:)forControlEvents:UIControlEventTouchUpInside];
    [aView addSubview:aButton];
}

然后：

- (void)buttonClicked:(UIButton*)button
{
    NSLog(@"Button %ld clicked.", (long int)[button tag]);
    // code here that picks the correct viewController to push to...
    // for example tag 1 would create an instance of vcTwo.m and would then be pushed to the navigationController and be displayed on screen
}

说我有三个UIViewController类（vcOne.m，vcTwo.m，vcThree.m），我希望它能够在按下按钮时运行'buttonClicked'并且代码选择相应的viewController来推送。我不想使用一系列if语句，因为最终可能有几十个/几百个viewControllers。我是否必须实例化所有viewControllers并将它们放在一个数组中？还有更好的方法吗？

Answer 1

你在使用故事板吗？所以你可以根据按钮标签选择一个segue：

int i = (int)[button tag];
[self performSegueWithIdentifier:[NSString stringWithFormat:@"Segue%d", i] sender:self];

或：

UIViewController *viewController= [controller.storyboard instantiateViewControllerWithIdentifier:NSString stringWithFormat:@"ViewControllerNumber%d", i];

Answer 2

最后我接受了这个：

- (void) buttonClicked:(id)sender
{
    NSLog(@"Button tag = %li", (long)[sender tag]);
    FormularyVC *formularyVCInstance = [FormularyVC alloc];
    ProceduresVC *proceduresVCInstance = [ProceduresVC alloc];
    VetMedVC *vetMedVCInstance = [VetMedVC alloc];

    NSArray *vcArray = [NSArray arrayWithObjects:formularyVCInstance, proceduresVCInstance, vetMedVCInstance, nil];

    UIViewController *vcToLoad = [vcArray objectAtIndex:(int)[sender tag]];
    vcToLoad.view.backgroundColor = [UIColor whiteColor];
    [self.navigationController pushViewController:vcToLoad animated:NO];

}

我根据按下的按钮创建了一个我希望能够加载的ViewControllers数组。按下按钮时，将运行方法并将标记作为参数。此标记用于通过检查其在数组索引上的位置来查找所需的ViewController。

使用编程方式创建的UIButtons使用相同的方法加载不同的UIViewControllers

2 个答案: