不适用nib，用代码写最小的ios程序

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1 创建ios工程，single view的

2 删除除了main.m以外的.m .h文件，删除故事板(同时修改info.plist)、nib文件

3 修改main.m文件，直接return 0

4 编译一下，应该可以编译通过

现在是一个裸工程，没有功能，但是能够编译通过。

以下代码写入main.m文件，编译运行

#import <UIKit/UIKit.h>@interface ViewController: UIViewController@end@implementation ViewController- (void)viewDidLoad{[super viewDidLoad];UILabel *lab = [[UILabel alloc]initWithFrame: [UIScreen mainScreen].bounds];lab.backgroundColor = [UIColor greenColor];lab.textColor = [UIColor whiteColor];lab.textAlignment = NSTextAlignmentCenter;lab.font = [UIFont boldSystemFontOfSize: 16];lab.text = @"hello world";[self.view addSubview: lab];}- (void)didReciveMemoryWarning {}@end@interface AppDelegate: UIResponder <UIApplicationDelegate>@property (strong, nonatomic) UIWindow *window;@end@implementation AppDelegate- (BOOL)application: (UIApplication *)application didFinishLaunchingWithOptions: (NSDictionary *)didFinishLaunchingWithOptions{ViewController *vc;vc = [[ViewController alloc]init];_window = [[UIWindow alloc]initWithFrame: [UIScreen mainScreen].bounds];_window.rootViewController = vc;[_window addSubview: vc.view];[_window makeKeyAndVisible];return YES;}- (void)applicationWillEnterForeground: (UIApplication *)application {}- (void)applicationDidEnterBackground: (UIApplication *)application {}- (void)applicationWillBecomeActive: (UIApplication *)application {}- (void)applicationResignActive: (UIApplication *)application {}- (void)applicationTerminate: (UIApplication *)application {}@endint main(const int argc, char *argv[]){@autoreleasepool {return UIApplicationMain(argc, argv, nil, NSStringFromClass([AppDelegate class]));}}

运行截图

空白的函数申明都是可以移除的，实际代码很少，ios程序的架构可以看的更清楚。

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