Objective c 调用方法以查看控制器委托，won'；不要忽略模态视图

我设置了以下简单的视图控制器类

@protocol ThermoFluidsSelectorViewControllerDelegate;

@interface ThermoFluidsSelectorViewController : UIViewController <UITextFieldDelegate>
@property (weak, nonatomic) id <ThermoFluidsSelectorViewControllerDelegate> delegate;
// user hits done button
- (IBAction)done:(id)sender;
@end

@protocol ThermoFluidsSelectorViewControllerDelegate <NSObject>
-(void) didFinishSelection:(ThermoFluidsSelectorViewController *)controller fluidID:    (NSString *)fluidID;
@end

---

调用了“done:”方法（通过警报检查），但没有调用“didFinishSelection…”，因此视图不会返回主屏幕。有什么想法吗？

听起来好像您还没有在主视图控制器中分配您的代理

在设置代理的主视图控制器中，应该有如下内容：

    ThermoFluidsSelectorViewController *view = [[ThermoFluidsSelectorViewController alloc] init];
    view.delegate = self;

在这里，您可以看到我创建了视图，然后将视图的委托设置回我自己

如果您没有创建Thermo。。。以编程方式查看控制器，但使用了故事板，则可以在主视图控制器的prepareforsgue:方法中设置委托：

// Do some customisation of our new view when a table item has been selected
- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender
{
    // Make sure we're referring to the correct segue
    if ([[segue identifier] isEqualToString:@"MySegueID"]) {

    // Get reference to the destination view controller
    ThermoFluidsSelectorViewController *cont = [segue destinationViewController];

    // set the delegate
    cont.delegate = self;

---

希望这有帮助。

这正是我忘记做的。刚刚看了另一篇文章，正要编辑我的文章。谢谢

// Do some customisation of our new view when a table item has been selected
- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender
{
    // Make sure we're referring to the correct segue
    if ([[segue identifier] isEqualToString:@"MySegueID"]) {

    // Get reference to the destination view controller
    ThermoFluidsSelectorViewController *cont = [segue destinationViewController];

    // set the delegate
    cont.delegate = self;