Question

我想创建一个只有一个视图的应用程序（TestViewController.h TestViewController.m）。（没有Tabbar，没有导航栏）不知道为什么我启动应用程序后，屏幕是完全黑色的。似乎应用程序没有成功加载视图？因为如果加载视图，屏幕应该是白色的。我是对还是不对？

这是AppDelegate.h

#import <UIKit/UIKit.h>
@class TestViewController;
@interface AppDelegate : UIResponder <UIApplicationDelegate>
{
    UIWindow *window;
    TestViewController *testrViewController;   
}
@property (strong, nonatomic) UIWindow *window;
@property (strong, nonatomic) TestViewController *testViewController;

@end

这是AppDelegate.m

#import "AppDelegate.h"
#import "TestViewController.h"

@implementation AppDelegate

@synthesize window = window;
@synthesize testViewController;

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
    [self.window addSubview:testViewController.view];
    [self.window makeKeyAndVisible];
    return YES;
}

Answer 1

在我看来，你并没有实例化课程

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
 // add this line
 testViewController = [[TestViewController alloc] init];
 [.....]
 }

希望有所帮助

Answer 2

如果您以编程方式创建它，那么您还应该实例化window

UIWindow *aWindow = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
self.window = aWindow;
[aWindow release];

然后是你的ViewController

testViewController = [[TestViewController alloc] init];

然后让它可见

[self.window addSubview:testViewController.view];
    [self.window makeKeyAndVisible];

Answer 3

你为testViewController创建了.xib吗？如果没有，那么你必须在testViewController上添加一个子视图。然后试试。我希望它能奏效。

UIView *testView=[[UIView alloc]initwithFrame:CGRectMake(0,0,320,480)];

[testViewController addsubview:testView];
[self.window addSubview:testViewController.view];
[self.window makeKeyAndVisible];

应用启动时加载视图

3 个答案: