Question

我有一个小问题。基本上，我有一个位于导航栏下方的UIWebView，因此我需要向下滚动才能查看内容，并在最后向上滚动。如何让UIWebView出现在导航栏的正下方？

#import "RootViewController.h"
@implementation RootViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    webview=[[UIWebView alloc]initWithFrame:self.view.bounds];
    NSString *url=@"http://localhost/";
    NSURL *nsurl=[NSURL URLWithString:url];
    NSURLRequest *nsrequest=[NSURLRequest requestWithURL:nsurl];
    [webview loadRequest:nsrequest];
    [self.view addSubview:webview];

    navBar = [[UINavigationBar alloc] init];
    navBar.frame = CGRectMake(0, 0, self.view.frame.size.width, 44);
    UINavigationItem*navItem = [[[UINavigationItem alloc] initWithTitle:@"iPaint"] autorelease];
    UIBarButtonItem*leftButton = [[[UIBarButtonItem alloc] initWithTitle:@"Left" style:UIBarButtonItemStylePlain target:self action:@selector(rightButtonPressed)] autorelease];
    navItem.leftBarButtonItem = leftButton;
UIBarButtonItem*rightButton = [[[UIBarButtonItem alloc] initWithTitle:@"Right" style:UIBarButtonItemStylePlain target:self action:@selector(rightButtonPressed)] autorelease];
    navItem.rightBarButtonItem = rightButton;
navBar.barStyle = UIBarStyleDefault;
    navBar.items = [NSArray arrayWithObject:navItem];
    [self.view addSubview:navBar];
}

-(void)leftButtonPressed{
//Code Here
}

-(void)rightButtonPressed{
//Code Here
}
@end

main.mm代码：

int main(int argc, char **argv) {
        NSAutoreleasePool *p = [[NSAutoreleasePool alloc] init];
        int ret = UIApplicationMain(argc, argv, @"comvlad1kwebApplication", @"comvlad1kwebApplication");
        [p drain];
        return ret;
}

// vim:ft=objc

我正在使用Theos，所以我没有Xcode，因此我需要手动执行。谢谢。

编辑：以下是屏幕截图的链接：http://i.imgur.com/aQ4yuyp.png

Answer 1

主要问题是您手动创建UINavigationBar。你想要的是使用UINavigationController，它是一个视图控制器，管理一堆其他视图控制器和它们之间的导航。在您的应用程序委托中，您可能具有如下所示的代码：

// Assuming that your UIApplication Delegate has a _viewController ivar which is properly memory-managed.
- (void)applicationDidFinishLaunching:(UIApplication *)application {
    _window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
    _viewController = [[RootViewController alloc] init];
    [_window addSubview:_viewController.view];
    [_window makeKeyAndVisible];
}

该代码片段创建RootViewController的实例，并将其设置为应用程序中的主视图控制器。您想要的是将RootViewController放在UINavigationController内，如下所示：

// Assuming that your UIApplication Delegate has a _viewController ivar which is properly memory-managed.
- (void)applicationDidFinishLaunching:(UIApplication *)application {
    _window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
    _viewController = [[RootViewController alloc] init];
    UINavigationController *navController = [[[UINavigationController alloc] initWithRootViewController:_viewController] autorelease];
    [_window addSubview:navController.view];
    [_window makeKeyAndVisible];
}

创建UINavigationController子类后，您应该从UINavigationBar中删除RootViewController，因为不再需要它。

Answer 2

您不应根据viewDidLoad方法中控制器的视图框架设置视图框架。在viewWillAppear上设置webView和NavigationBar的框架。

此外，您可能希望使用UINAvigationController，而不是手动添加UINavigationBar

#import "RootViewController.h"
@implementation RootViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    webview=[[UIWebView alloc]initWithFrame:CGrectZero];
    NSString *url=@"http://localhost/";
    NSURL *nsurl=[NSURL URLWithString:url];
    NSURLRequest *nsrequest=[NSURLRequest requestWithURL:nsurl];
    [webview loadRequest:nsrequest];
    [self.view addSubview:webview];

navBar = [[UINavigationBar alloc] init];

    UINavigationItem*navItem = [[[UINavigationItem alloc] initWithTitle:@"iPaint"] autorelease];
    UIBarButtonItem*leftButton = [[[UIBarButtonItem alloc] initWithTitle:@"Left" style:UIBarButtonItemStylePlain target:self action:@selector(rightButtonPressed)] autorelease];
    navItem.leftBarButtonItem = leftButton;
UIBarButtonItem*rightButton = [[[UIBarButtonItem alloc] initWithTitle:@"Right" style:UIBarButtonItemStylePlain target:self action:@selector(rightButtonPressed)] autorelease];
    navItem.rightBarButtonItem = rightButton;
navBar.barStyle = UIBarStyleDefault;
    navBar.items = [NSArray arrayWithObject:navItem];
    [self.view addSubview:navBar];



}

- (void)viewWillAppear:(BOOL)animated{
  navBar.frame = CGRectMake(0, 0, self.view.frame.size.width, 44);
  CGRect r = self.view.bounds;
  r.origin.y = CGRectGetMaxY(navBar.frame);
  r.size.width = r.size.width - CGRectGetMaxY(navBar.frame);
  [webView setFrame:r];
}


-(void)leftButtonPressed{
//Code Here
}

-(void)rightButtonPressed{
//Code Here
}
@end

为什么导航栏位于UIViewWeb之上？（OBJ-C初学者）

2 个答案:

为什么导航栏位于UIViewWeb之上？ （OBJ-C初学者）

2 个答案:

为什么导航栏位于UIViewWeb之上？（OBJ-C初学者）