objective-c - UIPickerview 将文本传递给另一个视图中的标签

Question

我刚开始学习，所以请放轻松...

目标是获取选取器中所选行的文本值，并将其显示在另一个视图的标签中。

现在我很难存储字符串值，一切都编译和加载，但第二个视图中的标签保持空白。请让我去noobify。

//String taken from selected pickerview line and stored in selectedstring
NSString *string = [NSString stringWithFormat:@"You Selected: %@",[_platforms objectAtIndex:row]];
Selectedstring.text = string;

在“下一个视图”按钮按下：

- (IBAction)NextView:(id)sender {
SecondView *secondview = [[SecondView alloc]init];

self.SecondViewData = secondview;
SecondViewData.passedValue = Selectedstring.text;

[self presentViewController:secondview animated:YES completion:nil];

然后在下一个视图的“viewdidload”区域中，我有：

label.text = passedValue;

Answer 1

您只需要在 ViewWillAppear 而不是 viewDidLoad 中编写以下语句。

label.text = 传递值；

谢谢

Answer 2

- (void)pickerView:(UIPickerView *)pickerView didSelectRow: (NSInteger)row inComponent:(NSInteger)component {
    SecondView *secondview = [[SecondView alloc]init];

self.SecondViewData = secondview;
SecondViewData.passedValue = Selectedstring.text;

[self presentViewController:secondview animated:YES completion:nil];
secondview.label.text = passedValue;  //passing values to uilabel
}