如何以编程方式传递 prepareForSegue 以编程方式创建的对象答案

【问题标题】：How to pass prepareForSegue programmatically an objected created programmatically如何以编程方式传递 prepareForSegue 以编程方式创建的对象
【发布时间】：2016-10-10 07:34:54
【问题描述】：

我有一个循环，我在其中创建带有调用 prepareForSegue 的选择器的按钮。我会将我单击的按钮的图像传递到下一页。

for (i = 1; i <=  22; i++) //22 it's just temporary
{
    //creating button
    UIButton *button = [UIButton buttonWithType:UIButtonTypeCustom];
    [button addTarget:self
               action:@selector(nextPage: )
     forControlEvents:UIControlEventTouchUpInside];
    [button setTitle:@"" forState:UIControlStateNormal];
    button.frame = CGRectMake(X, Y, 100.0, 100.0);
    UIImage *buttonImageNormal = [UIImage imageNamed:@"ambient.png"]; 

    //image obviously will be different and i want to pass that



    [button setBackgroundImage:buttonImageNormal forState:UIControlStateNormal];
    if (i%3==0 && i==0)
        X = 20;
    if (i%3==0 && i!=0){
        X = 20;
        Y = Y+150;
    }
    if (i%3==1)
        X = 140;
    if (i%3==2)
        X = 260;
    [_scroll addSubview:button];
}

这是每个按钮调用的方法

-(void)nextPage:(id)sender {
UIViewController *myController = [self.storyboard instantiateViewControllerWithIdentifier:@"signSegue"];
[self.navigationController pushViewController: myController animated:YES];
}

这就是prepareForSegue

- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender
{

addController *controller = (addController *)segue.destinationViewController;
}

我必须通过控制器传递什么？

【问题讨论】：

标签： objective-c

【解决方案1】：

你可以这样做

-(void)nextPage:(id)sender {

    UIButton *pressedButton=(UIButton *)sender;
    SecondViewController *myController = [self.storyboard instantiateViewControllerWithIdentifier:@"SecondViewController"];
    myController.pressedButtonImageName=pressedButton.currentBackgroundImage;
    [self.navigationController pushViewController: myController animated:YES];
}

在你的第二个 VC 中：

@property (nonatomic,strong) UIImage *pressedButtonImageName;

在这里，你不需要对prepareForSegue 方法做任何事情。

【讨论】：

【解决方案2】：

您不应该直接致电prepareForSegue。相反，您应该 trigger your segue programmatically，让框架负责在适当的时候调用 prepareForSegue：

[self performSegueWithIdentifier:@"mySegue" sender:self];

【讨论】：