如何用新的viewController替换当前的viewController

Question

我正在尝试用新的viewController替换当前的viewController.我以前能够做到这一点,但我遇到了一些BAD_ACCESS问题.

这是当我想用新的视图替换当前视图时将运行的代码.

(该函数将使用本地属性"self.some_data"调用(非原子,保留))

-(void) labelSelected:(SomeDataObject*) some_data{ 
   SomeViewController *viewController = (SomeViewController*)[[ClassManager sharedInstance] viewControllerForClassIdentifier:@"com.somename" fromPlistFileName:@"iPhoneScreenList"];


   viewController.data = (NSObject*)some_data;
   [some_data retain];

   //[self.navigationController pushViewController:viewController animated:YES];

   UINavigationController *tempNavigationController = self.navigationController;

   [[self retain] autorelease];

   [tempNavigationController popViewControllerAnimated:FALSE];
   [tempNavigationController pushViewController:viewController animated:TRUE];
}

这里一切正常.问题是,如果我发布新的"viewController",它会崩溃.如果我选择:

[tempNavigationController popViewControllerAnimated:TRUE];

我得到一些非常奇怪的行为,控制器永远不会被替换,我返回到rootController,导航栏上有两层文字.

如果我这样做:

[tempNavigationController pushViewController:viewController animated:FALSE];

我得到BAD_ACCESS并且应用程序崩溃了.它以前工作过,但现在不再工作了.

我究竟做错了什么？

谢谢!

Answer 1

使用类别进行控制器更换:

//  UINavigationController+ReplaceStack.h


@interface UINavigationController (ReplaceStack)

- (void) replaceLastWith:(UIViewController *) controller;

@end

//  UINavigationController+ReplaceStack.m

#import "UINavigationController+ReplaceStack.h"

@implementation UINavigationController (ReplaceStack)

- (void) replaceLastWith:(UIViewController *) controller {
    NSMutableArray *stackViewControllers = [NSMutableArray arrayWithArray:self.viewControllers];
    [stackViewControllers removeLastObject];
    [stackViewControllers addObject:controller];
    [self setViewControllers:stackViewControllers animated:YES];
}

@end