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我今晚正在做一些测试,以查看 native UINavigationBar
的行为。我创建了一个执行以下操作的简单代码片段:
- (void)pushController {
PHViewController *ctrl2 = [[[PHViewController alloc] initWithNibName:@"PHViewController" bundle:nil] autorelease];
ctrl2.shouldShowPrompt = YES;
[self.viewController pushViewController:ctrl2 animated:YES];
}
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
self.window = [[[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]] autorelease];
// Override point for customization after application launch.
PHViewController *ctrl = [[[PHViewController alloc] initWithNibName:@"PHViewController" bundle:nil] autorelease];
ctrl.shouldShowPrompt = YES;
ctrl.navigationItem.rightBarButtonItem = [[[UIBarButtonItem alloc] initWithTitle:@"Push"
style:UIBarButtonItemStyleDone
target:self
action:@selector(pushController)] autorelease];
self.viewController = [[[PHNavigationController alloc] initWithRootViewController:ctrl] autorelease];
self.window.rootViewController = self.viewController;
[self.window makeKeyAndVisible];
return YES;
}
现在我已经子类化了 UINavigationController
的 UINavigationBar
(我知道这是非法的,这是一个教育问题)并且我已经覆盖了以下方法:
- (void)setItems:(NSArray *)items animated:(BOOL)animated {
NSLog(@"Setting Navigation Item");
[super setItems:items animated:animated];
}
- (void)pushNavigationItem:(UINavigationItem *)item animated:(BOOL)animated {
NSLog(@"Pushing Navigation Item");
[super pushNavigationItem:item animated:animated];
}
- (UINavigationItem *)popNavigationItemAnimated:(BOOL)animated {
NSLog(@"Poping Navigation Item");
return [super popNavigationItemAnimated:animated];
}
- (void)setValue:(id)value forKeyPath:(NSString *)keyPath {
NSLog(@"Setting Value: %@ for keyPath:%@", value, keyPath);
[super setValue:value forKeyPath:keyPath];
}
这是我的问题:为什么控制台中存在“弹出导航项”(因此调用该方法)而“推送导航项”不是?
最佳答案
我找到了原因:它调用 - (void)pushNavigationItem:(UINavigation *)item 而没有调用 - (void)pushNavigationItem:animated!
还是谢谢你!
关于ios - UINavigationBar -pushNavigationItem 在将新 Controller 推送到 UINavigationController 堆栈时从不调用,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/7356459/
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