IOS创建UI的方式

学习IOS之处，不知道如何创建UI，现记录几种方式方便后续查看

1.不使用ViewController直接创建，如下：

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
self.window.backgroundColor = [UIColor blueColor];

UIView* view = [[UIView alloc] initWithFrame:CGRectMake(50, 100, 200, 200)];
view.backgroundColor = [UIColor redColor];
[self.window addSubview:view];
[view release];

[self.window makeKeyAndVisible];
return YES;
}

2.使用ViewController，自定义loadView，如下：

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
self.window.backgroundColor = [UIColor blueColor];

ViewController *rc=[[ViewController alloc] init];
self.window.rootViewController=rc;

[self.window makeKeyAndVisible];
return YES;
}

// ViewController
- (void)loadView {
UIView* view = [[UIView alloc] initWithFrame:[UIScreen mainScreen].applicationFrame];
view.backgroundColor=[UIColor yellowColor];
self.view=view;
}
// 如果ViewController没有重写loadView，则self.window则会创建一个empty view

3.使用xib

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
self.window.backgroundColor = [UIColor blueColor];

TestViewController* rc = [[TestViewController alloc] initWithNibName:@"View" bundle:nil];
self.window.rootViewController = rc;

[self.window makeKeyAndVisible];
return YES;
}

4.使用storyboard

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {

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

// 获取某个storyboard
UIStoryboard * storyBoard = [UIStoryboard storyboardWithName:@"Main" bundle:nil];

// 使用这个此storyboard的初始viewcontroller
//self.window.rootViewController = [storyBoard instantiateInitialViewController];

// 使用这个此storyboard的identifier为hello的viewtorller
self.window.rootViewController = [storyBoard instantiateViewControllerWithIdentifier:@"hello"];

self.window.backgroundColor = [UIColor whiteColor];
[self.window makeKeyAndVisible];
return YES;