Question

我的iPhone导航应用程序中有一个自定义UIButton类。当用户点击按钮时，我会出现一个模态视图，显示用户可以选择的记录的tableview列表。

点击按钮后，我创建了我的viewController并使用以下代码显示它：

-(void) touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event{
    dropDownPickerViewController = [[DropDownListingViewController alloc] initWithNibName:@"DropDownListingView" bundle:[NSBundle mainBundle]];
    .....
    .....

[[(AppDelegate_iPhone *)[[UIApplication sharedApplication] delegate] navigationController] presentModalViewController:dropDownPickerViewController animated:NO];
[dropDownPickerViewController release];

[super touchesEnded:touches withEvent:event];
}

正如你所看到的那样，按钮可以在任何viewController上，所以我从app delegate中获取了navigationController。在我的DropDownPickerViewController代码中，当用户选择记录时，我有以下内容：

[[(AppDelegate_iPhone *)[[UIApplication sharedApplication] delegate] navigationController] dismissModalViewControllerAnimated:NO];

但没有任何事情发生。它似乎冻结并挂起，不允许与表单进行任何交互。关于为什么我的ModalViewController不会被解雇的任何想法？我认为这是我使用app委托来呈现viewController的方式。有没有办法在UIButton类中使用self.ParentViewController，这样我就可以获得按钮所在视图的ViewController（如果这是问题）？

非常感谢任何想法。

由于

Answer 1

在DropDownPickerViewController中，而不是：

[[(AppDelegate_iPhone *)[[UIApplication sharedApplication] delegate] navigationController] dismissModalViewControllerAnimated:NO];

尝试

[self dismissModalViewControllerAnimated:NO];

Answer 2

我会在按钮的“父”viewController上调用一个方法，然后从那里开始。

Answer 3

我确实记得我曾经做过一次类似的事情，看看这篇文章：

Get to UIViewController from UIView?

我能够创建一些类别：

//
//  UIKitCategories.h
//

#import <Foundation/Foundation.h>

@interface UIView (FindUIViewController)
- (UIViewController *) firstAvailableUIViewController;
- (id) traverseResponderChainForUIViewController;
@end

@interface UIView (FindUINavigationController)
- (UINavigationController *) firstAvailableUINavigationController;
- (id) traverseResponderChainForUINavigationController;
@end




//
//  UIKitCategories.m
//

#import "UIKitCategories.h"

@implementation UIView (FindUIViewController)
- (UIViewController *) firstAvailableUIViewController {
    // convenience function for casting and to "mask" the recursive function
    return (UIViewController *)[self traverseResponderChainForUIViewController];
}

- (id) traverseResponderChainForUIViewController {
    id nextResponder = [self nextResponder];
    if ([nextResponder isKindOfClass:[UIViewController class]]) {
        return nextResponder;
    } else if ([nextResponder isKindOfClass:[UIView class]]) {
        return [nextResponder traverseResponderChainForUIViewController];
    } else {
        return nil;
    }
}

@end

@implementation UIView (FindUINavigationController)
- (UINavigationController *) firstAvailableUINavigationController {
    // convenience function for casting and to "mask" the recursive function
    return (UINavigationController *)[self traverseResponderChainForUINavigationController];
}

- (id) traverseResponderChainForUINavigationController {
    id nextResponder = [self nextResponder];
    if ([nextResponder isKindOfClass:[UINavigationController class]]) {
        return nextResponder;
    } else {
        if ([nextResponder isKindOfClass:[UIViewController class]]) {
            //NSLog(@" this is a UIViewController ");
            return [nextResponder traverseResponderChainForUINavigationController];
        } else {
            if ([nextResponder isKindOfClass:[UIView class]]) {
                return [nextResponder traverseResponderChainForUINavigationController];
            } else {
                return nil;
            }
        }
    }
}

@end

然后你可以这样打电话给他们：

UINavigationController *myNavController = [self firstAvailableUINavigationController];

UIViewController *myViewController = [self firstAvailableUIViewController];

也许他们会帮助你，我希望如此。

iPhone自定义UIButton不能DismissModalViewController

3 个答案: