Xcode/iPhone：第一个基于Windows的应用程序 - 为什么TabBarController视图中没有显示任何东西

  • Z时代
  • 2024-01-10
  • 分类：问答

使用基于Windows的模板时，是否需要记住一些事情？因为我不清楚为什么选项卡显示出来，但视图中没有任何内容显示出来。Xcode/iPhone：第一个基于Windows的应用程序 - 为什么TabBarController视图中没有显示任何东西

你能帮忙吗？因为我现在已经搜索了几个小时之前的问题，而且我还没有找到任何可以解决的问题。

AnotherMadeUpAppDelegate.h

#import <UIKit/UIKit.h> 
#import "AnotherMadeUpViewController.h" 
@interface AnotherMadeUpAppDelegate : NSObject <UIApplicationDelegate> { 
} 
@property (nonatomic, retain) IBOutlet UIWindow *window; 
@end

AnotherMadeUpAppDelegate.m

#import "AnotherMadeUpAppDelegate.h" 
@implementation AnotherMadeUpAppDelegate 
@synthesize window=_window; 
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions 
{ 
    // Override point for customization after application launch. 
    UIViewController *vc1 = [[UIViewController alloc] init]; 
    UIViewController *vc2 = [[UIViewController alloc] init]; 
    AnotherMadeUpViewController *vc3 = [[AnotherMadeUpViewController alloc] init]; 
    UITabBarController *tbc = [[UITabBarController alloc] init]; 
    tbc.viewControllers = [NSArray arrayWithObjects:vc1, vc2, vc3, nil]; 
    [vc1 release]; 
    [vc2 release]; 
    [vc3 release]; 
    [self.window addSubview:tbc.view]; 
    [self.window makeKeyAndVisible]; 
    return YES; 
} 
... 
@end

AnotherMadeUpViewController.h

#import <UIKit/UIKit.h> 
@interface AnotherMadeUpViewController : UIViewController<UIScrollViewDelegate> 
{ 
    IBOutlet UIPageControl *pageControl; 
    IBOutlet UIScrollView *scroller; 
    IBOutlet UILabel *label; 
} 
@property (nonatomic,retain)IBOutlet UIPageControl *pageControl; 
@property (nonatomic,retain)IBOutlet UIScrollView *scroller; 
@property (nonatomic,retain)IBOutlet UILabel *label; 
-(IBAction)clickPageControl:(id)sender; 
@end

AnotherMadeUpViewController.m

#import "AnotherMadeUpViewController.h" 
@implementation AnotherMadeUpViewController 
@synthesize pageControl,scroller,label; 
-(IBAction)clickPageControl:(id)sender 
{ 
    int page=pageControl.currentPage; 
    CGRect frame=scroller.frame; 
    frame.origin.x = frame.size.width * page; 
    frame.origin.y = 0; 
    [scroller scrollRectToVisible:frame animated:YES]; 
} 
-(void)scrollViewDidEndDecelerating:(UIScrollView *)scrollView 
{ 
    int page = scrollView.contentOffset.x/scrollView.frame.size.width; 
    pageControl.currentPage=page; 
} 
- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil 
{ 
    self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil]; 
    if (self) { 
     // Custom initialization 
    } 
    return self; 
} 
- (void)dealloc 
{ 
    [super dealloc]; 
    [label release]; 
} 
- (void)didReceiveMemoryWarning 
{ 
    // Releases the view if it doesn't have a superview. 
    [super didReceiveMemoryWarning]; 
    // Release any cached data, images, etc that aren't in use. 
} 
#pragma mark - View lifecycle 
- (void)viewDidLoad 
{ 
    [super viewDidLoad]; 
    scroller.pagingEnabled=YES; 
    CGFloat labelOriginX = label.frame.origin.x; 
    CGFloat labelOriginY = label.frame.origin.y; 
    CGFloat scrollWidth = 0; 
    int pageNumber = 0; 
    for (int i=0; i<9; i++) 
    { 
     CGRect rect = label.frame; 
     rect.size.height = label.frame.size.height; 
     rect.size.width = label.frame.size.width; 
     rect.origin.x = labelOriginX + scrollWidth; 
     rect.origin.y = labelOriginY; 
     label.frame = rect; 
     label.text = [NSString stringWithFormat:@"%d", pageNumber]; 
     label.textColor = [UIColor redColor]; 
     [scroller addSubview:label]; 
     pageNumber++; 
     scrollWidth += scroller.frame.size.width; 
    } 
    scroller.delegate=self; 
    scroller.directionalLockEnabled=YES; 
    scroller.showsHorizontalScrollIndicator=NO; 
    scroller.showsVerticalScrollIndicator=NO; 
    pageControl.numberOfPages=9; 
    pageControl.currentPage=0; 
    scroller.contentSize=CGSizeMake(pageControl.numberOfPages*self.view.frame.size.width, self.view.frame.size.height); 
    [self.view addSubview:scroller]; 
} 
- (void)viewDidUnload 
{ 
    [super viewDidUnload]; 
    [label release]; 
    self.label = nil; 
    // Release any retained subviews of the main view. 
    // e.g. self.myOutlet = nil; 
} 
- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation 
{ 
    // Return YES for supported orientations 
    return (interfaceOrientation == UIInterfaceOrientationPortrait); 
} 
@end

回答：

解剖你的viewDidLoad -

scroller = [[UIScrollView alloc] initWithFrame:CGRectMake(0, 0, self.view.frame.size.width,self.view.frame.size.height)];

你似乎在这里创建一个新的滚动视图的实例，但你必须宣布它作为一个出口。如果您没有插座，请删除scroller的IBOutlet标签。如果你确实有一个并想使用它，那么删除上面的行。这样做将是一个较短的方式，

scroller = [[UIScrollView alloc] initWithFrame:self.view.bounds];

的另一件事是要创建10个标签，但不分配框架。向他们展示各自在不同的页面之一，

int pageNumber = 0; 
for (int i = 0; i < 10; i++) 
{ 
    UILabel *label = [[UILabel alloc] init]; 
    [label sizeToFit]; 
    label.center = CGPointMake (((2 * i + 1) * self.view.frame.size.width)/2, self.view.frame.size.height/2); 
    label.text = [NSString stringWithFormat:@"%d", pageNumber]; 
    [scroller addSubview:label]; 
    [label release]; 
    pageNumber++; 
}

后来设置contentSize显示10页，

scroller.contentSize = CGSizeMake(10 * self.view.frame.size.width, self.view.frame.size.height);

回答：

问题是这一行

AnotherMadeUpViewController *vc3 = [[AnotherMadeUpViewController alloc] init];

您需要将其更改为

AnotherMadeUpViewController *vc3 = [[AnotherMadeUpViewController alloc] initWithNibName:@"AnotherMadeUpViewController" bundle:nil];

然后您的.xib将被加载并且您的插座将被连接。

并且不要忘记将你的零售店连接到IB的文件所有者。

以上是 Xcode/iPhone：第一个基于Windows的应用程序 - 为什么TabBarController视图中没有显示任何东西 的全部内容， 来源链接： utcz.com/qa/266499.html

回到顶部